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Aftershocks of the March 1999 Chamoli Earthquake and Seismotectonic Structure of the Garhwal Himalaya

Geological Survey of India
Central Geophysics Division
27, J. L. Nehru Road
Calcutta, 700 016
jr_kayal{at}hotmail.com
(J.R.K., O.P.S., P.K.C.)
Geological Survey of India
Eastern Region
Salt Lake City
Calcutta, 700 064
(G.K.)
Geological Survey of India
Northern Region
Lucknow, 226 024
(S.R.)

Manuscript received 20 October 1999.

The aftershocks of the Chamoli earthquake (m_b 6.3) of 28 March 1999 are analyzed to understand the seismotectonic structure of the Garhwal Himalaya. The permanent as well as temporary microearthquake network data are used. The mainshock occurred on the Basement Thrust by thrust faulting. The aftershocks, on the other hand, are triggered at the seismogenic faults to the south of the Main Central Thrust (MCT) by thrust faulting as well as by strike-slip faulting, and all the events occurred above the plane of detachment/basement thrust. The MCT is not the seismogenic fault.

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