Seismogenesis of earthquakes occurring in the ancient rift basin of Kachchh, Western India - Intraplate Earthquakes - page 145

Figure 6.13 Results of HypoDD clustering analysis of the Hypo71 locations during 2007-11 in
Kachchh [Kutch] (modified after Rastogi et al ., 2013b). Epicenters of earthquakes of M 5are

shown by stars.The North Wagad, Gedi, and Gora Dungar faults show clear concentrations. The
Suvai transverse fault also shows a concentration of epicenters. Activity was seen along the Khadir
Transverse Fault (KTF) along which an M w 5.1 earthquake occurred on June 19, 2012, with a long
aftershock sequence. East of it and about 20 km west of Rapar, a concentration of several shocks
north of the NWF defines a N-S-trending transverse fault, as in the previous figure. A few shocks
of M w < 4.7 have occurred south of the KMF since 2006. As these are at shallow depths, they are
inferred to be associated with the KMF and association with the NWF is ruled out. For color version,
see Plates section.

aftershock zone of the 2001 earthquake, as well as nearby activated faults, was obtained
using precise relocations by double-difference (HypoDD). The hypocentral plots depict the
NWF being active from 8 to 35 km depth and the Gedi fault (GF) to 12 km depth. The
HypoDD plot for the period January 2007 to May 2011 (Rastogi et al ., 2012 ) indicates
clustering along the NWF and GF, and for the sequence of October 28, 2009, an M w 4.6
earthquake along Gora Dungar Fault and some concentration along the Khadir transverse
fault ( Figure 6.13 ) .