Characteristics of Earthquakes around Tirupattur(TN) and Seismotectonics of the Region

Seismic characteristics like frequency-magnitude relation, decay rate of aftershocks, foreshock-aftershock pattern and energy release are studied for earth tremors of magnitude ≤ 4.3 that occurred near Tirupattur town of North Arcot District of Tamilnadu during November 27, 1984 to February 23, 1985. These characteristics are interpreted in terms of ambient stress level and mechanical properties of rock media. An isoseismal map has been prepared from the felt reports and damage survey. This sequence was the first in the region that was well recorded at regional stations enabling inferences about seismotectonics of the region.