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light of the known geotectonic features based on the data from 1881 to 1972.
Now focal mechanism solutions of earthquakes using double couple hypothesis
have been discussed with reference to the plate theory of global tectonics
and the geological faults.
It was found that the constant b in Gutenberg-Ricliter's frequency
magnitude relationship was nearly I for both the periods of observations
namely 1920-1972 and 1963-1972 which was in agreement with the other
highly seismic regions of the world. Most of the new fault plane solutions
show significant strike slip movements with thrust faulting in this region.
Near the main boundary fault in northeast Himalaya, the pressures are
oriented almost along the strike of the fault while along the Manipur-Burina
border region, the pressures are acting at right angles or at acute angles to
the mountains and are shallow dipping.
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