Observing earthquake-related dewatering using MISR/Terra satellite data



On 26 January 2001, at 8:46 am, the Gujarat province of India (see Figure 1A) was hit by destructive earthquake.This earthquake, considered one of the two most damaging seismic events in Indian recorded history, caused the death of about 20,000 people and affected 16 million individuals. Both local residents and post-earthquake survey teams reported the fountaining of water and sediments on the ground, especially in the Rann of Kachchh, which formed deposits known as sand and silt blows [e.g., Bendick et al., 2001; Jain and Lettis, 2001; Tuttle et al., 2002]. The water flow was significant enough to reactivate ancient river channels and to form shallow lakes. (Extensive information concerning the Gujarat earthquake can be found on the following Web sites: http://geoinfo.usc.edu/, http://cires.colorado.edu/, http://www.ceri. memphis.edu/, http://home. hiroshima-u-ac.jp/.)