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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/997

Authors: McCalpin, J. P.*
Thakkar, M. G.*
Title: 2001 Bhuj-Kachchh earthquake: surface faulting and its relation with neotectonics and regional structures, Gujarat, Western India
Issue Date: 2003
Series/Report no.: 46 (5)
URI: http://hdl.handle.net/2122/997
Keywords: surface rupture
Kachchh earthquake
thrust fault
Abstract: Primary and secondary surface deformation related to the 2001 Bhuj-Kachchh earthquake suggests that thrusting movement took place along an E-W fault near the western extension of the South Wagad Fault, a synthetic fault of the Kachchh Mainland Fault (KMF). Despite early reconnaissance reports that concluded there was no primary surface faulting, we describe an 830 m long, 15-35 cm high, east-west-trending thrust fault scarp near where the seismogenic fault plane would project to the surface, near Bharodiya village (between 23°34.912'N, 70°23.942'E and 23°34.304'N, 70°24.884'E). Along most of the scarp Jurassic bedrock is thrust over Quaternary deposits, but the fault scarp also displaces Holocene alluvium and an earth dam, with dips of 13° to 36° south. Secondary co-seismic features, mainly liquefaction and lateral spreading, dominate the area south of the thrust. Transverse right-lateral movement along the «Manfara Fault» and a parallel fault near Bharodiya suggests segmentation of the E-W master faults. Primary (thrust) surface rupture had a length of 0.8 km, maximum displacement of about 35 cm, and average displacement of about 15 cm. Secondary (strike-slip) faulting was more extensive, with a total end-to-end length of 15 km, maximum displacement of 35 cm, and average displacement of about 20 cm.
Appears in Collections:04.06.02. Earthquake interactions and probability
04.06.01. Earthquake faults: properties and evolution
Annals of Geophysics

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