1997 Umbria And Marche Earthquake
The 1997 Umbria and Marche earthquake occurred in the regions of Umbria and Marche, central Italy on the morning of 26 September. It was preceded by a foreshock almost as strong as the main quake. The foreshock occurred at 02:33 CEST (00:33 UTC), rated Mw5.7, and the second – the main shock – occurred at 11:40 CEST (09:40 UTC), rated Mw 6.0. Their epicentre was in Annifo. The mainshock was assigned X (Extreme) and foreshock VIII (Severe) on the Mercalli intensity scale.
There were several thousands of foreshocks and aftershocks from May 1997 to April 1998, more than thirty of which had a magnitude more than 3.5. Eleven people are known to have died following the shocks.
List of foreshocks and aftershocks
Only shocks (both foreshocks and aftershocks) with magnitude 5.0 or higher are listed.
| Date (YYYY-MM-DD) |
Time (UTC) |
Latitude | Longitude | Depth | Magnitude |
|---|---|---|---|---|---|
| 1997-09-26 | 00:33:12 | 43.048° N | 12.879° E | 10 km (6 mi) | 5.7 (Mw ) |
| 1997-09-26 | 09:40:26 | 43.084° N | 12.812° E | 10 km (6 mi) | 6.0 (Mw ) |
| 1997-09-26 | 09:47:38 | 43.163° N | 12.752° E | 10 km (6 mi) | 4.7 (Mw ) |
| 1997-10-03 | 08:55:21 | 43.075° N | 12.794° E | 10 km (6 mi) | 5.3 (Mw ) |
| 1997-10-06 | 23:24:52 | 43.045° N | 12.835° E | 10 km (6 mi) | 5.5 (Mw ) |
| 1997-10-12 | 11:08:36 | 42.901° N | 12.897° E | 10 km (6 mi) | 5.3 (Mw ) |
| 1997-10-14 | 15:23:10 | 42.962° N | 12.892° E | 10 km (6 mi) | 5.6 (Mw ) |
| 1997-11-09 | 19:07:33 | 42.903° N | 12.948° E | 10 km (6 mi) | 5.0 (Mw ) |
| 1998-03-26 | 16:26:11 | 43.255° N | 12.969° E | 10 km (6 mi) | 5.4 (Mw ) |
| 1998-04-03 | 07:26:36 | 43.164° N | 12.701° E | 10 km (6 mi) | 5.2 (Mw ) |
| 1998-04-05 | 15:52:20 | 43.185° N | 12.719° E | 10 km (6 mi) | 5.0 (Mw ) |