indo–us workshop on “intraplate seismicity†- The CERI Blog
indo–us workshop on “intraplate seismicity†- The CERI Blog
indo–us workshop on “intraplate seismicity†- The CERI Blog
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Kanter, 1990). <strong>The</strong> recent 2001 Bhuj earthqukae with magnitude Mw7.6, the rupture remained<br />
c<strong>on</strong>cealed below the ground at a depth of 7-‐10 km, suggestive of occurrence <strong>on</strong> blind fault (Mandal<br />
and Hort<strong>on</strong>, 2007). It is a matter of c<strong>on</strong>cern that if movements <strong>on</strong> a blind fault are capable of<br />
producing large magnitude earthquakes, than having earthquakes of similar magnitude or larger <strong>on</strong><br />
active faults with surface rupture cannot be ruled out (Malik et al., 2008; Morino et al., 2008). Active<br />
faults are c<strong>on</strong>sidered to be the source for large magnitude earthquakes in seismically active regi<strong>on</strong>s.<br />
<strong>The</strong>ir proper identificati<strong>on</strong> and distributi<strong>on</strong> significantly help in knowing the seismic potential and<br />
associated hazard in the regi<strong>on</strong>. <strong>The</strong> landscape of Kachchh is marked by several E-‐W striking<br />
l<strong>on</strong>gitudinal faults viz. the Allah Bund Fault (ABF), Island Belt Fault (IBF), South Wagdh Fault (SWF),<br />
Kachchh Mainland Fault (KMF), and Katrol Hill Fault (KHF). Under the project sp<strong>on</strong>sored by Gujarat<br />
State Disaster Management Authority (GSDMA) <strong>on</strong> Seismic Microz<strong>on</strong>ati<strong>on</strong> of Gandhidham, Kachchh,<br />
we carried out active fault mapping and paleoseismic investigati<strong>on</strong>s al<strong>on</strong>g ABF, KMF and KHF. In this<br />
paper we highlight in brief our findings based <strong>on</strong> detailed satellite data interpretati<strong>on</strong> for<br />
identificati<strong>on</strong> of active faults and related geomorphic features as well as paleo-‐earthquake<br />
signatures preserved in sediment successi<strong>on</strong> (Figures 1 & 2).<br />
Figure 1. Generalized structural map of Kachchh regi<strong>on</strong> (after Biswas and Deshpande, 1970). Inset at the left top show DEM<br />
of India highlight the locati<strong>on</strong> of Kachchh peninsula and Makran Subducti<strong>on</strong> Z<strong>on</strong>e (MSZ). Inset at the lower right shows<br />
major geomorphic z<strong>on</strong>es of Kachchh. Yellow box marks the study area al<strong>on</strong>g Kachchh Mainland Fault and Katrol Hill Fault,<br />
and al<strong>on</strong>g Allah Bund Fault. NHR-‐ Northern Hill Range, KHR-‐ Katrol Hill Range, KMF-‐ Kachchh Mainland Fault and KHF-‐<br />
Katrol Hill Fault.