Seismogenesis of earthquakes occurring in the ancient rift basin of Kachchh, Western India - Intraplate Earthquakes - page 131

Figure 6.3 (a) DEM and faults in the KR. (b) Depth section across the KR inferred from detailed
geological mapping by Biswas ( 2005 ) (lower part). (c) Depth section modified based on new geo-
physical surveys as well as hypocentral depths by Biswas. The intrusive magmatic body and fluid
zones around it are shown.

southward dip of the KMF. The dips given by Rastogi are based on two magnetotelluric
profiles, 20 km apart, lying east and west of the epicenter of the 2001 Bhuj earthquake
(23 18.6 E, about 15 km northwest of Bhachau) (Mohan et al ., 2013). The two

faults are observed down to at least 12 km depth in the two 22 and 15 km long profiles with
station spacing of 1-2 km ( Figure 6.4 ) . The surface extension of the NWF would mark the
boundary betweenMesozoic and Tertiary formations. From the magnetotelluric surveys, the
sediments are found to be 1.5 to 2.3 km thick in the Samkhiali basin and 5-6 km in theWagad

26.4 N70 ° °