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Hazard implications of the late arrival of the 1945 Makran tsunami

Rajendran, CP and Ramanamurthy, MV and Reddy, NT and Rajendran, Kusala (2008) Hazard implications of the late arrival of the 1945 Makran tsunami. In: Current Science, 95 (12). pp. 1739-1743.

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The 1945 Makran earthquake is known to have generated tsunami surges that affected the coasts of Iran, Pakistan, Oman and India. However, there is a significant delay in tsunami arrivals at various coastal sites with respect to the origin time of the earthquake. We explored the archival data to obtain arrival times and run-up heights at some important port cities along the Pakistan and Indian coasts. Numerical model for wave propagation based on the available rupture parameters predicts arrival times 17 and 28 min ahead of the actual arrival of the first surge at Karachi and Pasni respectively. There was also a significant discrepancy (>3 h) between the origin time of the earthquake and the observed arrival times of the second wave at various locations, which was the largest of the surges. We attribute this disparity in arrival time of the tsunami surges to submarine landslides triggered by the earthquake. Submarine slide-triggered tsunami is an underestimated threat in the Indian Ocean, and therefore, the regional tsunami hazard models of both the Arabian Sea and the Bay of Bengal should incorporate such overlooked mechanisms.

Item Type: Journal Article
Publication: Current Science
Publisher: Indian Academy of Sciences
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: Arrival times;seismicity;subduction zones;tectonics; tsunami.
Date Deposited: 14 Sep 2009 09:18
Last Modified: 19 Sep 2010 05:24
URI: http://eprints.iisc.ac.in/id/eprint/18621

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