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

Saurabh Baruah ¹, Ranju Duarah ¹, Dilip K. Yadav ¹

Affiliations
1 Geoscience Division, Regional Research Laboratory, Jorhat-6, Assam, IN

Abstract

The study of eleven years (1982-1993) of seismicity (focal depths<60km) in the Shillong-Mikir massif of N.E.R., India (25°-27°N) clearly delineates the pattern of activity within this region. The most important feature is a concentration of events in the depth range of 20 to 40 km where 70% of the activity took place. Minor seismicity prevails in the other ranges. The results from the focal mechanism solutions of 12 events of magnitude >5.0 ascertain thrust and strike slip type mechanisms within the depth range of <40km while dip-slip and normal type solutions are occurring in the range >40km. The compressional axis of most of the events is oriented along north-northwesterly direction.

Keywords

Geophysics, Seismicity, Assam.

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