Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

C. V. Ramakrishna Rao ¹, P. Solomon Raju ¹

Affiliations
1 National Geophysical Research Institute, Hyderabad - 570 007, IN

Abstract

A total of 45 stations were operated by different agencies to record the aftershocks of the september 30, 1993 Latur earthquake. In the present study 220 aftershocks were located using the combined data set. Most of the epicentres follow the course of river Tirna and confined to area of 10 km radius. To homogenise the estimation of magnitudes an empirical relation for estimating magnitude from signal duration, Ms = -1.6757 ± 1.9484 log D, is derived, where Ms is the surface wave magnitude and D is the total signal duration in sec. The magnitudes can be estimated with an accuracy of + 0.24 units using the above relation, Focal mechanism solutions for six aftershocks are reported in this study. The majority of the solutions are in agreement with the solution of the main shock. The pressure axis as determined from the focal mechanism solutions of the aftershocks is oriented along NE - SW direction.

Keywords

Latur Earthquake, Aftershock Activity, Focal Mechanism, Maharashtra.

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C. V. Ramakrishna Rao ¹, P. Solomon Raju ¹

Affiliations
1 National Geophysical Research institute, Hyderabad-500 007, IN

Abstract

The micro-seismic activity experienced in the Jubilee Hills area of the Hyderabad city, A.P. in recent years is attributable to the residual stresses that are generated due to the northward movement of the Indian Plate coupled possibly with skin effects.

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