The Kinnaur earthquake, Himachal Pradesh, India, of 19 January, 1975

Khattri, K. ; Rai, K. ; Jain, A. K. ; Sinvhal, H. ; Gaur, V. K. ; Mithal, R. S. (1978) The Kinnaur earthquake, Himachal Pradesh, India, of 19 January, 1975 Tectonophysics, 49 (1-2). pp. 1-21. ISSN 0040-1951

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/004019...

Related URL: http://dx.doi.org/10.1016/0040-1951(78)90095-1

Abstract

Determination of the fault-plane solution of the Kinnaur earthquake by first motion and amplitude data of P waves, along with other geological and geophysical data, indicates a N-S-trending and westward-dipping fault plane with purely dip-slip displacement. This plane coincides with the N-S extending zone of aftershocks, ground fissures and faults observed in the epicentral tract following the earthquake. The cumulative strain release pattern displays a characteristic release of logarithmic recovery followed by exponential recovery. The aftershocks display a notable migration in space. They also show two distinct phases of seismic activity. The main earthquake is estimated to have a fault length of 25 km, fault area of 575 km2, volume of strain of ~2900 km3, displacement of 59 cm, stress drop of 36 bars, and strain release of 5.9 . 10-5.

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