Seismotectonic Study of the Two Recent SCR Earthquakes in Central India
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Fault-plane solutions of the Killari earthquakes reveal reverse faulting for the main shock and the deeper aftershocks (depth 6-15 km) and strike-slip faulting for the shallower aftershocks (0-5 km). It is inferred that interaction of two faults generated the main shock and the aftershocks at shallower depth. These two faults are correlatable with the E-W Tirna river and NW-SE Tirna tributary. The Jabalpur earthquake and its aftershocks, on the other hand, reveal a consistent reverse-fault mechanism with a left-lateral strike-slip motion. The deep ischolar_mained Narmada South Fault has been activated at the crust-mantle boundary and generated the main shock and the aftershocks at deeper depth. The consistent NNE-SSW compressional stress, revealed by the fault-plane solutions, suggests that the SCR earthquakes in Peninsular India are generated by the relative movement of various crustal blocks along pre-existing faults/weak zones at different depth levels due to post collisional movement of the Indian plate in the NNE direction.
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