Abstract
A new seismogenetic belt has been identified in the well-known transition zone of peninsular India (lat. 12°–14° N and long. 74°–80° E) based on a critical analysis of historical and recent seismic data. The diffused and weak seismicity in the area could be attributed to the reactivation of adjoining shear zones. A seismic energy release map has been prepared for southern peninsular India, which depicts the long-term seismicity in this region. Temporal variations in seismic activity in space indicate migration of seismic activity from east to west within the transition zone. This phenomenon is discussed in relation to the mobility of shear belts adjacent to the Dharwar Craton. Further, the maximum horizontal principal compressive stress directions on the Indian continent are also briefly discussed. These stresses may be mainly responsible for the mobility of the major shear zones adjacent to the Dharwar Craton. The analysis of the seismic data in space and time, thus, suggests two possible geodynamic models viz., (1) a stick-slip model and (2) a crustal shortening model.
Published Version
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