Abstract
At the Himalayan trench three consecutive swarms (i.e. the precursory swarm, the main-shock swarm and the aftershock swarm) have been reported to occur in small epicentral regions. In these swarms the magnitudes of the main-shock events are one to two units higher than the other two. These swarms appear to be related to each other. In order to establish the relationship between the first two swarms, focal mechanism studies for main shocks and the precursory swarms were carried out. The study of the precursory swarm demonstrates the converging nature of stresses in the epicentral region of the main-shock swarm. This suggests that the stresses responsible for the precursory swarms are also the cause of the main-shock swarms. The aftershock swarms are the result of the interaction of the converging stresses with the outward stresses generated due to adjustment of faulted blocks during large earthquakes. In view of the above, it can be asserted that precursory swarms are precursors to the main shocks.
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