On the aftershock sequence of a 4.6 mb earthquake of the Garhwal Himalaya

Sarkar, Irene ; Chander, Ramesh ; Chatterjee, Dalia (1995) On the aftershock sequence of a 4.6 mb earthquake of the Garhwal Himalaya Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, 104 (4). pp. 683-691. ISSN 0253-4126

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Official URL: http://www.ias.ac.in/j_archive/epsci/104/4/683-691...

Related URL: http://dx.doi.org/10.1007/BF02839303


Locally recorded data for eighteen aftershocks of a magnitude(mb) 4.6 earthquake occurring near Ukhimath in the Garhwal Himalaya were analysed. A master event technique was adopted to locate seventeen individual aftershock hypocentres relative to the hypocentre of the eighteenth aftershock chosen as the master event. The aftershock epicentres define an approximately 30 km2 rupture zone commensurate with the magnitude of the earthquake. The distribution of epicentres within this zone and the limited amount of first motion data support the view that a group of parallel, sub-vertical, sinistral strike-slip faults oriented N46°, transverse to the regional NW-SE trend of the Garhwal Himalaya, was involved in this seismic episode. Since the estimated focal depth range for aftershocks of this sequence is 3-14 km, we infer that this transverse fault zone extends through the upper crustal layer to a depth of 14 km at least.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Aftershocks; Himalaya; Earthquakes; Garhwal
ID Code:7643
Deposited On:25 Oct 2010 10:57
Last Modified:16 May 2016 17:47

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