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The west Andaman fault and its influence on the aftershock pattern of the recent megathrust earthquakes in the Andaman-Sumatra region

DRS at CSIR-National Institute of Oceanography

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Title The west Andaman fault and its influence on the aftershock pattern of the recent megathrust earthquakes in the Andaman-Sumatra region
 
Creator KameshRaju, K.A.
Murty, G.P.S.
Amarnath, D.
MohanKumar, M.L.
 
Subject shipboard gravity
seismic data
 
Description Distinctly different rupture patterns of December 2004 and March 2005 megathrust earthquakes occurred in the Andaman-Sumatra region suggest strong influence of tectonic and structural elements. We have analysed the shipboard gravity, bathymetry and seismic data across the West Andaman Fault (WAF), a major tectonic feature in the Andaman Sea, to infer the crustal structure and to examine its influence in controlling the aftershock pattern. Our results support the idea of Singh [2005] that WAF forms a lithospheric scale boundary and together with other tectonic elements modulates the occurrence of large earthquakes and their rupture pattern. The active strike-slip motion along the WAF, presence of backarc spreading coupled with increased obliquity of subduction in the Andaman Sector reduce the probability of occurrence of major or great earthquakes north of 10°N.
 
Date 2007-05-01T10:08:15Z
2007-05-01T10:08:15Z
2007
 
Type Journal Article
 
Identifier Geophysical Research Letters, vol.34(3), 5pp.
http://drs.nio.org/drs/handle/2264/599
 
Language en
 
Rights An edited version of this paper was published by AGU. Copyright [2007] AGU. To view the published open abstract, go to http://dx.doi.org and enter the DOI.
 
Format 1240973 bytes
application/pdf
 
Publisher American Geophysical Union