Slow Slip Acceleration beneath Andaman Islands Triggered by the 11 April 2012 Indian Ocean Earthquakes

Paul, J and Rajendran, K and Rajendran, CP (2014) Slow Slip Acceleration beneath Andaman Islands Triggered by the 11 April 2012 Indian Ocean Earthquakes. In: BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA, 104 (3). pp. 1556-1561.

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Abstract

The M-w 8.6 and 8.2 strike-slip earthquakes that struck the northeast Indian Ocean on 11 April 2012 resulted in coseismic deformation both at near and distant sites. The slip distribution, deduced using seismic-wave analysis for the orthogonal faults that ruptured during these earthquakes, is sufficient to predict the coseismic displacements at the Global Positioning System (GPS) sites, such as NTUS, PALK, and CUSV, but fall short at four continuous sites in the Andaman Islands region. Slip modeling, for times prior to the events, suggests that the lower portion of the thrust fault beneath the Andaman Islands has been slipping at least at the rate of 40 cm/yr, in response to the 2004 Sumatra-Andaman coseismic stress change. Modeling of GPS displacements suggests that the en echelon and orthogonal fault ruptures of the 2012 intraplate oceanic earthquakes could have possibly accelerated the ongoing slow slip, along the lower portion of the thrust fault beneath the islands with a month-long slip of 4-10 cm. The misfit to the coseismic GPS displacements along the Andaman Islands could be improved with a better source model, assuming that no local process contributed to this anomaly.

Item Type:	Journal Article
Publication:	BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
Additional Information:	Copy right for this article belongs to the SEISMOLOGICAL SOC AMER, 400 EVELYN AVE, SUITE 201, ALBANY, CA 94706-1375 USA
Department/Centre:	Division of Mechanical Sciences > Centre for Earth Sciences
Date Deposited:	21 Aug 2014 10:26
Last Modified:	21 Aug 2014 10:26
URI:	http://eprints.iisc.ac.in/id/eprint/49600

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