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Recent microtremors near the Idukki Reservoir, Kerala, South India

Rajendran, Kusala and Rajendran, CP and Kesavan, Sreekumari and Naveen, R (2012) Recent microtremors near the Idukki Reservoir, Kerala, South India. In: CURRENT SCIENCE, 102 (10). pp. 1446-1451.

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The continuing low-level seismicity in the vicinity of the Idukki Reservoir, Kerala, is interesting from the perspective of hydrologically triggered earthquakes. While the frequency of triggered earthquakes in the vicinity of a reservoir usually reduces with time and the largest earthquake usually occurs within a few years on the initial filling, the triggered seismicity in the proximity of the Idukki Reservoir seems to be showing a second, delayed peak, as the 1977 (M 3.5) tremor was followed by a slightly larger event in 2011, 24 years after the first burst of activity. Quite unprecedented in the context of reservoir-triggered sequences, we consider this delayed sequence as the hydrologic response of a critically stressed hypocentral region, to monsoonal recharging. The sustained activity several decades after the impoundment and the temporal relation with the monsoon suggest that at least some parts of the reservoir region continue to retain the potential for low-level seismic activity in response to hydrologic cycles.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the Indian Academy of Sciences
Keywords: Hydrologic cycles;microtremors;reservoir;triggered earthquakes
Date Deposited: 24 Jul 2012 12:53
Last Modified: 24 Jul 2012 12:53
URI: http://eprints.iisc.ac.in/id/eprint/44837

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