A source model for the M_ww 7.8 earthquake produced by the USGS from observed seismic waves, taking into account preliminary rupture mapping from satellite data, uses three fault segments with individual lengths, widths, strikes and dips of >40 km (25 mi) × 30 km (19 mi), 028°/85° (Segment 1), >175 km (109 mi) × 30 km (19 mi), 060°/85° (Segment 2) and >160 km (99 mi) × 20 km (12 mi), 025°/75° (Segment 3). The mainshock produced a maximum slip of 11.2 m (37 ft) along Segment 2, beneath Sakarya in Kahramanmaraş Province, northeast of the junction where it meets Segment 1. Another zone of large slip estimated at 4.96 m (16.3 ft) occurred further northeast along Segment 2, northwest of Adıyaman.

The USGS source model for the M_w 7.7 earthquake which struck nine hours later has three large fault segments with individual lengths, widths, strikes and dips of >70 km (43 mi) × >20 km (12 mi), 276°/80° (Segment 1), >40 km (25 mi) × >20 km (12 mi), 250°/80° (Segment 2) and ~80 km (50 mi) × >20 km (12 mi), 060°/80° (Segment 3). Maximum displacement occurred on Segment 1 at 11.4 m (37 ft).

Three segments of the EAF were involved in the M_w  7.8 rupture; the Amanos, Pazarcık and Erkenek segments. The earthquake ruptured ~370 km (230 mi) of the EAF, producing a maximum slip of up to ~12 m (39 ft) along the Pazarcık segment. The northern end of the rupture was about 20–30 km (12–19 mi) south of the M_w  6.8 earthquake that struck in 2020. This section of the EAF, the Pütürge segment, between both earthquakes, may represent a seismic gap. The southern segment of the EAF rupture was at its termination, near Antakya. Slip peaked at 12 m (39 ft) from the surface to 7 km (4.3 mi) depth during the M_w  7.7 earthquake; slip was 11 m (36 ft) at the surface. Slip along the fault was compact—mostly confined to within the Çardak Fault; it was also shallower—attenuating from 8–12 km (5.0–7.5 mi). Slip during the M_w  7.8 event extended to 18 km (11 mi) and 12 km (7.5 mi) for the M_w  7.7 event. The M_w  6.4 aftershock that struck Antakya on 20 February had a rupture area of 25 km (16 mi) × 25 km (16 mi) and produced a peak slip of 0.93 m (3 ft 1 in) at 8.3 km (5.2 mi) depth.

Preliminary analysis of the effects of stress changes caused by the M7.8 earthquake on the Çardak–Sürgü Fault, based on the USGS fault model, indicated up to 3 bars of added stress near the epicenter of the M7.7 shock, sufficient to trigger rupture on that zone, assuming that it was already close to failure. Stress on the Hatay Fault, source of the 20 February M_w  6.4 aftershock, increased by 1 bar following the 6 February earthquakes.

Preliminary analysis based on seismology and observations of surface rupture suggest rupture along a branch of the DST before transitioning onto the EAF where most of the faulting was observed. The initial rupture at the site of the epicenter of the M7.8 shock on the Narlı Fault, the northernmost section of the DST. The fault ruptured unilaterally northwards until it reached the Pazarcık segment of the East Anatolian Fault. Ruptures then continued bilaterally to the northeast and southwest along this segment. This subevent on the Narlı Fault corresponded to a M_w  7.0 earthquake which ruptured for 20 seconds. It had a focal mechanism corresponding to oblique-normal faulting. A preliminary analysis of near-field (within 1 km (0.62 mi) of the fault rupture) seismic records indicates that the initial rupture speed transitioned to supershear after propagating about 19.5 km (12.1 mi) away from the epicenter along the Narlı Fault before it reached the EAF. Back projection suggests the total rupture length was ~560 km (350 mi).

The rupture continued northeast onto the Ekernek segment and to the southwest onto the Amanos segment. The northeastern rupture ceased 55 seconds after initiation while the southwestern rupture ceased near Antakya about 80 seconds later. A M_w 6.8 aftershock occurring 11 minutes later and west of the first M>7 epicenter may have ruptured along the Sakçagöz Fault, the next segment of the DST to the south. Rupture along the EAF during the event occurred at subshear velocity (maximum 3.2 km (2.0 mi) per second). An analysis of near-field seismic data revealed transient supershear rupture episodes throughout the EAF rupture. Supershear rupture occurred along the northernmost section of the Narlı Fault where it meets the EAF. The rupture transitioned onto the EAF and propagated northeast at supershear velocity until its termination near Malatya. Rupture towards the southwest was mostly subshear, but at the southern termination in Hatay, where the fault has multiple branches and kinks, supershear was likely observed. Supershear rupture at the southern termination contributed to the intense ground motion in Antakya.

The second M>7 earthquake initiated on a separate fault known as the Çardak–Sürgü Fault Zone, part of the northern strand of the East Anatolian Fault. The rupture propagated bilaterally along the Çardak segment, continuing eastwards onto the Sürgü segment before continuing eastwards to Malatya along the northeast–southwest trending Doğanşehir Fault Zone. Rupture also propagated towards the southwest along the Çardak segment. The total rupture length was estimated at 160 km (99 mi). The westward-propagating rupture occurred at supershear velocity (maximum 4.8 km (3.0 mi) per second) while the eastward-propagating rupture occurred at subshear velocity (maximum 2.8 km (1.7 mi) per second). The rupture lasted about 35 seconds.

The M_w  6.4 aftershock on 20 February occurred along the Hatay Fault. The focal mechanism indicated normal faulting along a northeast–southwest striking fault.

The extent of surface ruptures associated with the M7.8 and M7.7 earthquakes have been mapped using a mixture of satellite imagery and ground observations. Pixel matching on images captured by Sentinel-1 before and after the earthquakes showed sharp discontinuities in displacement, revealing two separate zones of surface rupture. The longer of the pair, produced by the first earthquake, measured 320 km (200 mi) while the second earthquake produced 150 km (93 mi) of surface rupture. These observations were backed up with direct imaging of the ruptures using other satellite data, such as from the DigitalGlobe's WorldView-1, 2 & 3 and GeoEye-1, and by field work. The surface rupture and focal mechanism during the first subevent on the Narlı Fault also indicated a large normal faulting component.

The zone of surface rupture extended from north of Antakya, Hatay Province towards Pazarcık, Kahramanmaraş Province and Gölbaşı, Adıyaman Province. Surface ruptures continued north of these cities. Surface rupture occurred in the Amik Valley. The westernmost part of Hatay Airport was damaged by surface ruptures but cracks in the runway were attributed to ground deformation. A major canal was damaged and lead to flooding in parts of the Amik Valley which was formerly Lake Amik. Field observations indicate a maximum displacement of 7.3 m (24 ft) on the surface. Geologists traced a 15 km (9.3 mi) surface rupture trending south from Pazarcık with an offset of 2.5 m (8 ft 2 in). From Golbasi to Nurdağı ground displacements were up to 5 m (16 ft). The surface rupture observed during the M7.8 earthquake was unusually large, comparable to that during the 1906 San Francisco earthquake along the San Andreas Fault.

Large surface offsets of 6–8 m (20–26 ft) were observed along the Sürgü-Çardak Fault. Along a road west of Gözpınar [ce; tr; tt; vi], the rupture displaced the road left-laterally for 8.6 m (28 ft). The largest maximum surface offset was 10.0–12.6 m (32.8–41.3 ft); one of the largest surface offsets ever observed from an earthquake.

Ground acceleration values recorded in some areas near the fault rupture were in excess of 1 g. Three USGS seismic installations, two at Antakya and one at Hassa, recorded large ground accelerations and velocities. The town of Hassa recorded 0.9082 g in ground acceleration (pga) and 215.34 cm/s (84.78 in/s) in ground velocity. The station data corresponded to a Modified Mercalli intensity of X (Extreme). A peak ground acceleration of 1.62 g was recorded by a station at Fevzipaşa. The peak ground acceleration generally exceeded 0.5 g in a large area around the epicenter, near Adiyaman and a large part of Hatay. High pga values of 2 g were recorded in Hatay. The maximum recorded pga was 2.212 g at a station in Pazarcık Belediyesi Parkı, Pazarcık; a government health facility nearby had limited damage but the surrounding town was devastated. The maximum recorded pga during the M_w  7.7 earthquake was 0.59 g at Göksun.

According to Kandilli Observatory, the maximum Mercalli intensity (MMI) of the mainshock was estimated to have reached MMI XI–XII (Extreme) in Antakya and near the epicenter. MMI XI (Extreme) or higher was observed along the fault rupture from the epicenter to Antakya. The MMI also reached IX–X (Violent–Extreme) in Kahramanmaraş and İskenderun, VIII–IX (Severe–Violent) in Malatya and Adıyaman, VII–VIII (Very strong–Severe) in Gaziantep, Kilis, Idlib and Aleppo, and VI–VII (Strong–Very strong) in Adana and Şanlıurfa. The maximum MMI of the second earthquake was X (Extreme).

Liquefaction was identified via satellite and remote sensing along the southern portion of the M_w 7.8 rupture on the East Anatolian Fault from Antakya to Gölbaşı. Liquefaction and lateral spreading were observed at and near coastal areas, fluvial valleys and drained lake or swamp areas, covered by Holocene sediments. These effects were widespread in the Amik Valley and Orontes River plain, north of Antakya, Hatay Province. Limited observations were made in high-elevation areas due to snow cover and lack of satellite observations. Liquefaction was also observed in Samandağ. At Lake Gölbaşı, Adıyaman Province, lateral spreading occurred along the northern, eastern and southern coast. Parts of the lakeshore were also submerged. Gölbaşı was also damaged by liquefaction and lateral spreading.

Subsidence due to lateral spreading caused extensive damage in İskenderun. Liquefaction produced sand ejecta that buried Atatürk Boulevard in Çay District. Regular flooding in the city was observed after the earthquakes. Earlier flooding may be attributed to liquefaction while subsequent occurrences may be due to damage to the coast and water infrastructure. The sea inundated parts of the city by as much as 200 m (660 ft). Large areas of the coast and sections of piers were flooded due to lateral spreading. Large waves from bad weather and a tsunami may have contributed to the effects observed at İskenderun.

Both earthquakes caused shaking levels (≥0.12 g) sufficient for landslide-triggering across a 90,000 km (35,000 sq mi) area. About 3,673 earthquake-triggered landslides were identified using satellite imagery, aerial photos, and one field survey of the area. Landslides mainly occurred in the northern region of the affected area. Rockslides were the most commonly observed; there were also many bedrock rotational landslides, translational slides and lateral spreads. Surface ruptures propagating through hillsides also triggered landslides. These landslides blocked roads and river channels, destroyed or seriously damaged buildings and caused many deaths.

One of the largest landslides occurred near Tepehan village, Hatay Province; a translational slide which detached a block 1.3 km (0.50 sq mi). This landslide occurred in a region comprising marl and clay-rich limestone. It produced a 20 m (66 ft) vertical displacement along its scarp. ITV News reported the landslide scarp was up to 1,000 ft (300 m) long and "wider than a football pitch" in some areas.

Despite an epicenter 90 km (56 mi) inland, a tsunami was recorded in the Mediterranean Sea. It was the first recorded tsunami in the eastern Mediterranean Sea region since the one produced by the 1953 M_L  6.2 earthquake in Cyprus. The largest wave measured 40 cm (16 in) along the Mediterranean coast of Turkey. Although no underwater surveys results have been made available to identify the sources of these tsunamis, they were likely produced by landsliding at Iskenderun Port and liquefaction on the coastal flatlands of Antakya.

Small tsunami waves were recorded off the coast of Famagusta, Cyprus, without damage. The tsunami measured 0.17 m (6.7 in), and tsunami waves were recorded at 0.12 m (4.7 in) at İskenderun and 0.13 m (5.1 in) at Erdemli. Tsunami warnings were issued for the southern Turkish coast, southern and eastern Italian coasts and the whole eastern Mediterranean Sea area, but later withdrawn.

The earthquake rupture terminated near Suvatlı in the Amik Valley, where some 10.5 km (6.5 mi) to its east is the Hacıpaşa Fault, a Dead Sea Transform segment. The rupture was arrested by a stepover that connects the East Anatolian Fault with the Hacıpaşa Fault. Though it did not rupture, the Coulomb stress increased on the Hacıpaşa Fault. With a combination of the increases stress, 600–900 years without major earthquakes, and an annual slip rate of 5 mm (0.20 in), it is a potential source of magnitude 7.0 or greater earthquakes. The accumulated slip along this segment is estimated at 3–9 m (9.8–29.5 ft). An earthquake "domino effect" remains plausible along the Dead Sea Transform beginning with the Hacıpaşa Fault, as observed along the North Anatolian Fault, where successive earthquakes have migrated westwards along the fault since 1939.

There were 53,537 deaths and 107,213 injured across 11 of the 17 affected provinces of Turkey. About 140 people remain missing; 118 in Hatay Province. At least 15.73 million people and 4 million buildings were affected. More than 2 million residents in the affected provinces were evacuated to nearby provinces including Mersin, Antalya, Mardin, Niğde and Konya. At least 518,009 houses and over 345,000 apartments were destroyed. More than 20 percent of Turkey's agriculture production was affected. The United Nations said crops, livestock, fisheries, aquaculture and rural infrastructure were heavily damaged. At least 516 university buildings were affected, of which 106 were heavily damaged.

By 23 February 2023, the Ministry of Environment, Urbanization and Climate Change conducted damage inspections for 1.25 million buildings; revealing 164,000 buildings were either destroyed or severely damaged. Another inspection carried out in March revealed that 1,411,304 housing units sustained light to moderate damage. Over 150,000 commercial infrastructure were at least moderately damaged. The International Organization for Migration estimated over 2.7 million people were made homeless. A damage assessment by the Turkish government revealed at least 61,722 buildings had to be demolished including 11,900 in Gaziantep Province, 10,900 in Hatay Province, 10,800 in Kahramanmaraş Province and 36,046 in Malatya Province. Broad fissures appeared on roads. During recovery efforts, body parts were often found in the rubble.

In Adana, 12 buildings collapsed in the city center, 23 were badly damaged and 120 were moderately damaged. Three apartments were among the buildings that collapsed in the city. Across Adana Province, damage assessments revealed 59 buildings, 1,274 apartments and 2,952 houses were destroyed, severely damaged or required demolition.

At least 300 buildings were razed in Malatya. Sixty percent of the city's buildings received damage. Nearly every neighborhood of the city was affected by collapsed buildings. Out of the 968 mosques in the city, 25 were destroyed and 420 others were damaged. Two hotels collapsed in Malatya, causing many casualties. The ceiling of Malatya Erhaç Airport experienced a partial collapse, as did the historic Yeni Camii mosque. Damage was also reported at the Arslantepe Mound. In Akçadağ, 11 people died, including four attributed to the second earthquake. At least 263 deaths were reported in Doğanşehir.

In Gaziantep, many of the historical sites were severely damaged, such as Gaziantep Castle, Şirvani Mosque and Liberation Mosque. The city recorded 16,211 collapses and buildings which were severely damaged or required demolition. In the city center, at least 154 people died after a four-story building collapsed; four other collapsed buildings left another 102 dead. In Nizip, at least 51 people were killed when a six-story apartment building collapsed.

In Nurdağı, nearly 2,500 people died and about 50 percent of the houses were badly damaged or destroyed. An additional 30 percent of its building stock received moderate damage. Mass graves were created to bury the overwhelming number of dead. Gaziantep Oğuzeli Airport was forced to restrict its service to rescue flights. Ninety percent of houses were heavily damaged or destroyed in Sakçagözü, and 256 people died. In İslahiye, there were 1,368 deaths, over 1,500 injuries and more than 200 destroyed apartments. There were over 130 deaths in Sulumağara; 200 in Altınüzüm; and 300–400 in Keküklü.

In Hatay Province, 13,517 buildings collapsed, 8,162 required demolition and 67,346 were heavily damaged, along with 215,255 houses. The districts of Antakya, Kırıkhan and İskenderun were the most affected. In Antakya, 70 percent of homes and 6,369 buildings collapsed, 3,734 had to be demolished and 21,830 were badly damaged. The runway at Hatay Airport was split and uplifted, causing flight cancellations. The Ankara Metropolitan Municipality completed repairs on the airport on 12 February, allowing its reopening. Two provincial hospitals and a police station were destroyed, and a gas pipeline exploded. The building that housed the assembly of Hatay State was destroyed, as was St. Paul's Church and the Habib'i Neccar Mosque, while damage occurred at the Antakya Synagogue and the Hatay Archaeology Museum. Several dozen buildings in Güzelburç district and nearly every house in the central and Cebrail districts collapsed. Most of the squad and coaching staff of the local football club Hatayspor were initially trapped in the collapse of their headquarters in Antakya before being rescued, with player Christian Atsu and sporting director Taner Savut dying. In Kırıkhan District, 1,886 buildings collapsed and 7,190 others were severely damaged or required demolition. At least 982 buildings were destroyed, 8,894 others were badly damaged and 943 had to be demolished in Defne. In Reyhanlı, 318 buildings collapsed and 1,661 others were severely damaged or required demolition. At least 187 buildings collapsed, 2,176 others were badly damaged and 194 others had to be demolished in Arsuz. In Kumlu, 131 buildings were destroyed, 738 others were severely damaged and 84 others required demolition. At least 58 buildings collapsed and 669 others were badly damaged or had to be demolished in Payas.

The collapse of the luxury Rönesans Rezidans apartment trapped an estimated 800 people, killing at least 269 and leaving 46 missing as presumed dead. In May 2023, an investigation by The New York Times found that inadequate design and safety lapses may have contributed to its collapse. An engineer revealed to the newspaper; "the building violated the basic tenets of engineering," after inspecting its blueprints. Contractors of the building said they adhered to building regulations but those were not enough against the earthquake.

The 13-storey apartment block consists of three closely spaced buildings linked externally, but not structurally; when the collapse occurred, all three buildings separated. The basement, two-storey parking space was considered the "strongest part" of the complex as it had more concrete walls than other parts of the structure. The building's exterior walls and those that separated units and rooms consisted of heavy masonry which may have prevented the structure from swaying and possibly held the building mostly intact despite toppling. The building was considered a soft story structure as the ground floor had fewer masonry walls which meant it was at greater risk of damage from seismic ground motion. Among other factors were that the core concrete columns which housed the elevator systems were situated along the north side which left the south side vulnerable without adequate support. Another reason was that beams emerging from either side of the building were misaligned and did not connect to each other. These features may have contributed to the building overturning onto its south side.

In İskenderun, an industrial city in Hatay Province, a large fire at the port was reported on 6 February at 17:00, believed to have originated from a container carrying flammable industrial oil, forcing the port's closure and the diversion of many ships. It was extinguished on 6 and 8 February, only for it to reignite the next day each time. It was finally extinguished on 10 February. A total of 3,670 containers were destroyed by the fire and the port managing authority said it would take three months for operations to resume. The city saw 534 buildings collapse, 337 requiring demolition and 4,622 receiving severe damage. Flooding occurred along the city shoreline, inundating streets up to 200 m (660 ft) inland. The Cathedral of the Annunciation, seat of the Roman Catholic Apostolic Vicariate of Anatolia, was almost completely destroyed. At least 3,109 people died in the city and over 12,000 were injured. In Erzin District, 31 buildings collapsed and 897 were heavily damaged or had to be demolished. However, there were no collapses or major damage in Erzin, the largest town in the district. Multiple factors including strict building codes prevented destruction. An estimated 20,000 people fled to Erzin, increasing its population by about 50 percent. In Samandağ, 670 buildings collapsed, 9,212 were badly damaged or required demolition and 7,850 people died. At least 1,046 buildings collapsed and 3,452 others were severely damaged or had to be demolished in Hassa District. In Altınözü, 838 buildings were destroyed, 3,892 others were badly damaged and 650 others required demolition. There were 213 collapsed buildings and 1,453 others had been severely damaged or had to be demolished in Yayladağı. At least 139 buildings collapsed, 755 others were badly damaged and 87 others had to be demolished in Belen. In Dörtyol, 115 buildings were destroyed and 2,030 others had to be demolished or were severely damaged.

Mass burials occurred in Kahramanmaraş for more than 5,000 bodies. A city official said the mass grave would eventually be the burial ground for 10,000 bodies. Around 75 percent of the city's buildings were damaged or destroyed. In Elbistan, 924 people died and 1,825 were injured. An estimated 2,000 buildings were destroyed. At Ordekdede, a village in Pazarcik District, almost all single-story buildings were decimated. None of the 140 houses in the village were structurally stable. Thirty-four people died in the village. At least 11 people died, 107 houses were destroyed and 70 percent of the building stock were damaged in Ekinözü. In Afşin, at least 180 people died. At least 335 buildings including 90 in the city center were destroyed. The Afşin-Elbistan Thermal Power Plant was also damaged. In Ericek [ce; tr; vi], a village in Göksun, 95 percent of homes were affected and 152 died. In Nurhak, there were around 200 deaths and all houses were severely damaged. In Türkoğlu, 1,171 buildings collapsed and 4,500 others required demolition.

In Adıyaman Province, over 20,000 buildings and 56,256 houses were destroyed. In the city of Adıyaman, four neighborhoods were razed. Many buildings along Atatürk Boulevard collapsed. The city hall, a 6th-century mosque and Gölbaşı District's state hospital were also destroyed. Isias Hotel, the largest hotel in the city, also collapsed, killing 65 people. Up to 10 percent of Adıyaman's population perished. The mayor of Kömür said the Karapınar and Bahçelievler neighborhoods were nearly destroyed. Destruction was also observed in Barbaros, Çelikhan, Sümerevler and Karapınar districts. In Harmanlı, a village in Gölbaşı District, 80–90 percent of it was destroyed. The second earthquake destroyed three buildings in the province. In Gölbaşı, 71 percent of the town's infrastructure was damaged or destroyed and 695 people were killed with over 400 injured, including 286 deaths in the town center. There were also 410 deaths in Besni District, about 90 percent of them in the town itself. In Kâhta, at least 55 people died.

In Diyarbakir Province, 8,602 houses were severely damaged or destroyed, and 124,432 others were partially damaged. Additionally, 8,086 buildings were damaged, required demolition or collapsed. Diyarbakır Fortress, a UNESCO World Heritage Site, was also partly destroyed. The adjacent World Heritage Site of Hevsel Gardens was also damaged. Part of the Galeria complex in Yenişehir, which included a shopping mall and dozens of apartments collapsed, killing 89 and injuring 22.

At least 466 buildings were heavily damaged in Şanlıurfa Province; 201 were destroyed. Structures around the Pool of Abraham were damaged. The minaret at the religious shrine partially collapsed, sending rubble into the pools below and discoloring the water, which was also contaminated by seeping sewage. In Eyyübiye District, the minaret of the Eyüp Prophet Mosque was damaged and removed. Thirty-three people were killed in the collapse of the Osman Ağan Apartment.

In Osmaniye Province, of the 22,841 buildings surveyed, 1,739 were heavily damaged, destroyed or required urgent demolition. Additionally, 16,111 houses were collapsed or were badly damaged, with partial damage occurring in 73,588 housing units. At least 1,088 of the 13,667 buildings examined in Merkez District were destroyed, seriously damaged or needed to be demolished.

In Kilis Province, 119 buildings were destroyed and 138 others were heavily damaged, along with 2,514 houses. In Batman Province, 218 buildings were damaged, and an additional 15 were completely destroyed. In Mardin Province, 59 buildings were heavily damaged and another 190 were slightly damaged and a death related to a heart attack occurred in Kızıltepe District. In Bingöl Province, several houses cracked and some livestock were killed by collapsing barns. In Samsun, damage occurred in Samsun Stadium. In Kayseri Province, eight buildings collapsed, while 5,252 others were damaged to some extent. Several houses were damaged and a barn collapsed in Muş Province. In Sivas Province, the second earthquake destroyed a few houses. In Giresun Province, a five-story building was damaged and evacuated. An unoccupied apartment in Elazığ was damaged and later collapsed during the second earthquake.

The dead included member of the Grand National Assembly of Turkey for Adıyaman Yakup Taş, Yeni Malatyaspor goalkeeper Ahmet Eyüp Türkaslan, former Turkish national handball team player Cemal Kütahya and his five-year-old son, and Saul Cenudioğlu, leader of the Jewish community in Antakya, who died along with his wife. Former MP for Kahramanmaraş Sıtkı Güvenç died from earthquake injuries on 9 February. Three Turkish soldiers died during rescue operations. Twenty-six local journalists, four doctors, 120 police officers and 32 gendarmeries were among the dead.

According to Turkish-backed officials on 2 February 2024, 4,537 people died in rebel-held areas while 1,414 died in government-controlled areas. The International Blue Crescent placed the death toll in Syria at 8,476. The Syrian Ministry of Health said over 2,248 died, most were in Aleppo and Latakia. In rebel-held areas, at least 4,547 people died. In a report by the International Medical Corps dated 8 March 2023, 7,259 people were confirmed dead.

Over 14,500 were also injured in Syria. Among the dead included 2,153 children and 1,524 women. The Syrian Network for Human Rights stated 73 medics, five media personnel, 62 workers in humanitarian agencies, and four civil defense personnel were among the dead. The Syrian Observatory for Human Rights said additional dead were buried before being registered and some victims died in hospitals. Syria's National Earthquake Centre said the earthquake is "the biggest earthquake recorded" in its operational history.

An estimated 5.37 million people across Syria may have been made homeless, while 10.9 million people, nearly half of Syria's population, were affected. More than 123 residential areas, villages, towns and cities were badly damaged. Many power plants, water facilities, hospitals and public infrastructure also sustained damage. At least 453 schools were damaged. Across the country, 22,452 housing units were destroyed and 62,878 others were damaged.

Hundreds were killed in the town of Atarib. In Jindires, over 1,100 people were killed and at least 250 buildings were razed; among the deaths were a family of seven—the only survivor was a newborn. In Jableh, at least 283 people died, 173 were injured and 19 buildings collapsed. Four bodies were recovered and 15 bodies were in the process of recovery during debris clearance on 10 February. On 11 February, six bodies were retrieved from the rubble of a collapsed house along al-Maliyeh Street. Civilians were stuck under the rubble for hours due to the lack of rescue teams in several villages such as Atarib, Besnaya, Jindires, Maland, Salqin and Sarmada. In Latakia Governorate, 142,000 people were affected; at least 805 people died and 1,131 others were injured. The region's governor said 105 buildings were destroyed, 247 were at risk of collapse and 900 others were severely damaged. At Tishreen University, ten students, three employees and a professor died. At least 48 people were killed in Hama, of which 43 were from the collapse of an eight-story building.

The Associated Press, citing local residents, said the Afrin Dam had cracked. On 9 February at 04:00, the dam burst and flooded the village of Al-Tloul, which was exacerbated by heavy rains along the Afrin River basin. Nearly all its residents fled; about 500 families were displaced. According to Reuters, citing local residents, between 35 and 40 people died and most buildings in Al-Tloul were damaged or destroyed by the earthquake. In Atarib, 148 bodies arrived at an underground hospital. A doctor at the hospital said some bodies were missing their head or limbs. Various archaeological sites in Tartus Governorate were damaged, including the Khawabi Castle and Aleika Castle, which partially collapsed. Damage to historical towers and infrastructure were also reported in Tartus and Safita.

The president of the Syrian American Medical Society, Amjad Rass, said emergency rooms were packed with injured. In Idlib Governorate, one hospital received 30 bodies. In the village of Azmarin, Idlib Governorate, at least 260 people died, including 51 members of one family; at least 300 were injured and 100 were rescued. Fifteen buildings in the village were leveled and about 50 percent of its housing stock had cracks. Footballer Nader Joukhadar, who played for the national team, was killed alongside his son when their home collapsed in Jableh.

According to the International Rescue Committee, the earthquake struck when rebel-held areas were preparing for a blizzard and experiencing a cholera outbreak. In Aleppo, dozens of buildings collapsed and at least 444 people died, including 163 children. By 8 February, the bodies of 210 victims were returned to their families. The Directorate-General of Antiquities and Museums said various archeological sites across the city were extensively cracked or collapsed. Cracks were also reported in the outer façade of the Aleppo National Museum. In Atarib, Aleppo, the Syrian American Medical Society hospital said 120 bodies were recovered. About 20,000 homes were affected in Aleppo, leaving 70,000 homeless. Total damage in the city exceeded US$403 million. In Rajo, the doors and walls of a prison facility cracked. Twenty prisoners, believed to be Islamic State (ISIS) members, escaped the facility.

In Damascus, many people fled from their homes onto the streets. In the northern parts of the city, many buildings were cracked. Many buildings in Syria had already been damaged by an almost 12-year-long civil war. The Crusader-built castle Margat suffered damage, with part of a tower and parts of some walls collapsing. Cracks also opened up in the walls of the Krak des Chevaliers castle. The Citadel of Aleppo was also affected. In addition, one of the towers of Sahyun Castle near Latakia was destroyed. The minaret of the Grand Mosque in Kobanî was also damaged.

• Destruction in Aleppo, Syria
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Foreign casualties by country

Country	Deaths in		Ref.
Syria	6,600
Afghanistan	300	—
Haiti	85
Palestine	54	51
Northern Cyprus	29	—
Yemen	29
Morocco	20
Lebanon	16	3
Iraq	13	—
Azerbaijan	10
France	8
Italy	7
Iran	6
Philippines	6
Somalia	6
Georgia	5
Ukraine	5
Indonesia	4
Netherlands	4
Russia	4
Uzbekistan	4
Australia	3
Egypt	3
Moldova	3
United States	3
Algeria	2
Austria	2
Greece	2
Kazakhstan	2
Belarus	1
Belgium	1
Bosnia and Herzegovina	1
Bulgaria	1
Cameroon	1
Canada	1
China	1
Colombia	1
Czech Republic	1
Ghana	1
Gibraltar	1
India	1
Jordan	1
Kyrgyzstan	1
Saudi Arabia	1
Serbia	1
Sri Lanka	1
Sudan	1
Thailand	1
Uganda	1
Total	7,255	54	Ref.
	7,309

At least 6,600 Syrians residing in Turkey were killed. According to Turkey's Presidency of Migration Management 1.75 million Syrians live in southern Turkey; 460,150 in Gaziantep; 354,000 in Antakya; 368,000 in Şanlıurfa; 250,000 in Adana. Turkey's health ministry returned the bodies of 1,793 Syrian victims to their relatives in Syria, while thousands of Syrians were buried in Turkey due to difficulties transporting them to Syria. At least 11 Iraqi war refugees died in Turkey.

At least 100 Afghans were killed by the earthquake in Turkey, mostly refugees who fled the country after the Taliban takeover in August 2021. Among the Lebanese fatalities was an entire family of three in Malatya. Ten Azerbaijanis were killed in Turkey, including four students in Malatya. An Italian family of six, and an entrepreneur also perished. Nineteen students, two teachers and a parent from Northern Cyprus died when the Isias Hotel in Adıyaman collapsed. Seven other Turkish Cypriots died in Hatay and Kahramanmaraş.

In Lebanon, residents were awakened from their sleep. Buildings in the country shook for up to 40 seconds. In Beirut, residents fled their homes and stayed in streets or drove in their vehicles to flee from buildings. The earthquake damaged 16,200 buildings across the country, including 10,460 in Beirut and 4,000 in Tripoli.

In Ashdod, Israel, a building was evacuated after cracks were observed in a pillar, and Champion Motors Tower in Bnei Brak was slightly damaged by the second earthquake. In Nicosia, Cyprus, some windows cracked, and the wall of a house collapsed, damaging two nearby vehicles. Six Cuvier's beaked whales were found dead along the island's northern coast on 10 February. The Department of Fisheries and Marine Research said there was a possible link between the beaching and earthquake as these whales' echolocation system are affected by sea disturbances.

The European-Mediterranean Seismological Centre said shaking was felt in Armenia, Egypt, Palestine, Georgia, Greece, Iraq, Jordan, Israel, and Russia. In Iraq, minor damage occurred in some houses and buildings in Erbil, and the city's citadel was severely damaged. In Egypt, tremors were strongly felt in the capital Cairo, and is considered the strongest earthquake felt since 1975. A 20 m (66 ft) crack appeared in the Corniche in Alexandria.

On 20 February, a M_ww 6.3 aftershock struck near Antakya, causing additional buildings to collapse in Samandağ and further damage in Antakya. Six people died in Antakya, Defne and Samandağ. At least 562 were injured including 18 in serious condition who received immediate medical attention before being taken to Adana and Dörtyol. AFAD warned residents to stay away from the coast as there was potential for a tsunami of up to 50 cm (20 in). The mayor of Hatay said several people were trapped under debris. A bridge was damaged and an empty three-story building in İskenderun collapsed. In Syria, five people died during stampedes and panic across several governates and at least 500 people were injured. The White Helmets said people in Aleppo and Idlib were injured by collapsed buildings. Some residents in Jinderis were injured after leaping off buildings. In northwestern Syria, damaged and abandoned buildings collapsed without casualties. Shaking was felt in Lebanon, Egypt and Jordan.

A M_ww 5.2 aftershock occurred on 27 February, near Yeşilyurt. It collapsed about 30 buildings in the town. Two people died and 140 others were injured; 12 in serious condition. One fatality and four injuries were attributed to a factory collapse in Kahramanmaraş Province.

On 25 July, a damaging M_ww  5.5 aftershock struck Kozan, Adana Province. The shock left 63 people injured in Adana and Osmaniye provinces. A house in Sumbas was also damaged by rockfalls. Another aftershock struck Malatya Province on 10 August, measuring M_ww  5.3. Twenty-three people were injured; 22 in Malatya and one in Adıyaman. One building collapsed and two were damaged in Malatya.

A M_ww  6.0 earthquake struck Kale District, Malatya Province on 16 October 2024, causing 254 injuries across seven provinces, with Elazığ Province alone recording 116 injuries.

Turkey was placed on a "level four" alert to request international aid. More than 53,000 Turkish search and rescue personnel were dispatched to the affected provinces. Seventy countries also assisted in these operations. In the first two days, more than 8,000 people were rescued and 380,000 people were relocated to shelters or hotels. An "air aid corridor" was established by the Turkish Armed Forces to mobilize search and rescue teams. Poor weather conditions and damaged roads hampered rescue and relief missions. By 19 February, most rescue efforts had concluded except in Hatay and Kahramanmaraş provinces.

Syria made an appeal to UN member states, the International Committee of the Red Cross, and other humanitarian organizations for international aid. President Bashar al-Assad ordered all teams of the civil defense, firefighting, health and public construction groups to be mobilized in the affected governates. He also added that medical services, food and shelter were urgently needed. The Ministry of Internal Trade and Consumer Protection was ordered by President al-Assad to supply food and organize teams to distribute them. Technical teams were also on site to evaluate building conditions and evacuate residents in at-risk structures. The Ministry of Water Resources was tasked with rapidly assessing damage to dams, reservoirs and water stations, and ensuring people have access to water. Some hotels including in Latakia and Damascus offered to accommodate to survivors free of charge and ensure basic necessities. Refugees and expatriates also opened their homes as shelters for people. Sports facilities, events venues, university dormitories and halls were also opened to take in people. The Syria Trust for Development announced the establishment of shelters across many governorates. Volunteer groups inspected buildings for damage and distributed food items, blankets and first aid essentials. Many hospitals were overwhelmed by the large number of casualties and prior to the earthquakes, were already experiencing supply shortages.

Arab League secretary-general Ahmed Aboul Gheit called for international assistance to help those affected by "this humanitarian catastrophe".

The Secretariat of ASEAN expressed its heartfelt sympathies and condolences to the Governments and peoples of the affected countries, especially the families of the victims of the earthquake. ASEAN affirms its solidarity with the Governments and peoples of Turkey and Syria in these trying times and stands ready to extend its assistance to the relief efforts.

President of the European Council Charles Michel and President of the European Commission Ursula von der Leyen expressed their condolences to those who lost their lives due to the earthquakes in Turkey and Syria and wished a speedy recovery to the injured. Michel and Leyen announced that the EU is ready for earthquake aid in Turkey and Syria. The European Union's European Civil Protection Mechanism, in which Turkey participates despite not being a member of the EU, was activated at the request of Turkey. The EU dispatched thirty-one rescue teams and five medical teams from 23 member states to Turkey, committed €3 million and €3.5 million to Turkey and Syria respectively, and announced a donor conference to raise money. The Copernicus Programme was also activated to provide emergency mapping services and other help.

NATO secretary-general Jens Stoltenberg said that member countries were mobilizing support. The Strategic Airlift Capability was used to transport search and rescue equipment. NATO deployed "fully equipped semi-permanent shelter facilities" to house displaced persons in Turkey. Flags at NATO headquarters were also lowered to half-mast. A vessel carrying the first 600 of 1,000 containers for temporary housing left Taranto, Italy for Turkey to accommodate at least 4,000 people.

Several United Nations agencies announced coordinated responses to the disaster, including UNDAC, OCHA, UNHCR, UNICEF and IOM. The World Health Organization's Regional Director for Europe, Hans Kluge, said the organization's regional offices were assisting international efforts to transport medicine and relief equipment. The UN released $25 million from its emergency fund for humanitarian assistance in Turkey and Syria. A second $25 million grant was released for relief efforts in Syria. UN sent humanitarian aid to Syria through Turkey via the Bab al-Hawa Border Crossing. Since then, 65 trucks have crossed, carrying health and nutrition items and other vital relief supplies for more than two million people. On 14 February, the UN appealed for €396 million to help survivors in Syria.

The World Bank said it would provide US$1.78 billion in aid for Turkey to support the relief and recovery process. "We are providing immediate assistance and preparing a rapid assessment of the urgent and massive needs on the ground," said World Bank President David Malpass.

President Erdoğan declared seven days of national mourning in Turkey on Twitter. Seven days of national mourning was observed in Northern Cyprus, and one day in Bangladesh and Kosovo. Albania's prime minister, Edi Rama, said 13 February would be a day of national mourning. On 13 February, all overseas diplomatic missions of North Macedonia lowered the Macedonian flags to half-mast.

Investigative reports revealed that Syrian government had deliberately obstructed aid to all of Syria's opposition-held areas, including the Idlib region, which was the worst-struck area in the earthquake. Syrian government officials and state-run media blamed United States and European Union sanctions against the country for the lack of humanitarian aid and hampering rescue. On 10 February, Syrian president Bashar al-Assad accused Western countries of having "no regard for the human condition." The US Treasury said its sanctions "contain robust exemptions for humanitarian efforts" in the first place, and that after the earthquake it issued a blanket authorization for relief efforts. The United Nations has also been criticized for its policy of focusing aid shipments solely to the regime, at the expense of Syrian lives in opposition-held territories.

Idlib Governorate, under the control of Syrian Salvation Government (SSG), was one of the hardest-hit territories. Assad regime's policy of besieging North-West Syria; which blockades the supply of food, medicines and other humanitarian supplies, has further deteriorated the crisis in Idlib. Abu Mohammad al-Julani, commander of the SSG-aligned Tahrir al-Sham rebel militia, criticized aid agencies of neglecting the situation in Idlib and called on the international community to be more proactive in reconstruction and relief efforts, adding that the "United Nations needs to understand that it's required to help in a crisis". Upon traveling to the Bab al-Hawa Border Crossing bordering the rebel-held territories, UNOCHA Under-Secretary Martin Griffith stated on 12 February that "We have so far failed the people in north-west Syria". As of 13 February, Ankara and the Turkish-backed Free Syrian Army were accused of blocking aid convoys sent by the Autonomous Administration of North and East Syria from entering the north-west region.

The United Nations criticized Russia's attempts to block delivery of aid through checkpoints to rebel-held territories. Secretary General António Guterres urged the Security Council to immediately permit aid flows into Northwestern Syria. United States appealed for the immediate opening of all closed checkpoints to send in relief efforts to all parts of Syria; calling for an emergency UN Security Council meeting to increase humanitarian assistance through Bab al-Hawa and open up more border crossings for the entry of UN aid. Stéphane Dujarric, a United Nations spokesperson, said on 14 February, "some aid is getting into the north-west, pointing to 58 trucks that arrived with aid through the Bab Al-Hawa crossing." However, the organization does not possess heavy equipment or search and rescue teams. He stressed that the "international community as a whole needs to step up to get that aid where it is needed."

Raed al-Saleh, chief of Syrian Civil Defence, strongly rebuked the UN for its negligence and delay in responding to the rescue efforts:

"Let me be clear: The White Helmets received no support from the United Nations during the most critical moments of the rescue operations.. The UN's failure to respond quickly to this catastrophe is shameful. When I asked the UN why help had failed to arrive in time, the answer I received was bureaucracy. In the face of one of the deadliest catastrophes to strike the world in years, it seems the UN's hands were tied by red tape."

Due to below-freezing temperatures in the affected areas in both Turkey and Syria, the mayor of Hatay, Lütfü Savaş, warned about the hypothermia risk. In Adiyaman Province, some residents trapped under rubble died from hypothermia.

Concerns arose regarding the possible spread of infection in areas where sanitation facilities were damaged or unfunctional. Due to water shortage experienced in both countries, many survivors could not shower. International health organizations said the shortage of clean water would be a public health risk. The World Health Organization said water shortage "increases the risk of waterborne diseases and outbreaks of communicable diseases."

On 18 February, Turkey's Health Minister Fahrettin Koca said there was an increase in intestinal and upper respiratory infection cases but "numbers did not pose a serious threat to public health." At a stadium serving as shelter in Kahramanmaraş, a clinic managed by 15 to 30 medics attended up to 10,000 patients in the day. The clinic provided tetanus shots and sanitary items to residents. Many people at the stadium were unable to shower and the six toilets were unable to accommodate to the large number of people. In Antakya, residents said more portable toilets were needed.

Health authorities in Turkey had to ensure earthquake survivors were free of disease. The World Health Organization collaborated with local authorities to monitor the rates of waterborne diseases, seasonal influenza and COVID-19 among the affected.

On the first anniversary of the earthquake on 6 February 2024, the Turkish government organized a series of programs to mark the disaster, with schools closed in the affected regions. In Antakya, a moment of silence was held at 04:17, when the earthquake struck, and carnations were scattered into the Orontes River. A silent march was held in Adiyaman while President Erdoğan visited Kahramanmaraş. Protests were also held in Antakya criticizing health minister Fahrettin Koca and mayor Lütfü Savaş, with demonstrators chanting "Can anyone hear me?", a reminder of cries for rescue following the earthquake and "We won't forget, we won't forgive." In Malatya Province, the governor banned events that were not officially sanctioned until 9 February.

• Aftermath of the 2023 Turkey–Syria earthquakes
• Humanitarian response to the 2023 Turkey–Syria earthquake
• List of costliest earthquakes
• List of earthquakes in 2023
• List of earthquakes in Turkey
• Lists of 21st-century earthquakes
• Reactions to the 2023 Turkey–Syria earthquakes

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• ReliefWeb's main page for this event.
• The International Seismological Centre has a bibliography and/or authoritative data for this event. – M_w  7.8 at 01:17 UTC
• The International Seismological Centre has a bibliography and/or authoritative data for this event. – M_w  7.7 at 10:24 UTC
• "Kahramanmaraş Supersite science page". Group on Earth Observations.