The Da'an River was affected by the 1999 Jiji earthquake, where a gorge was formed (called Da'an River Grand Canyon Chinese: 大安溪大峽谷). In some of the fastest erosion geologists have ever seen, the gorge is being eaten away from its upstream end at a rate of 17 meters per year. They expect the gorge to be erased after 50 years.
^"GeoNames Search". Geographic Names Database. National Geospatial-Intelligence Agency, USA. Retrieved 10 June 2016.
^"Da'an River" (in Chinese). Water Resources Agency, Ministry of Economic Affairs. Archived from the original on 29 October 2015. Retrieved 10 June 2016.