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

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...

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Bibliographic Details
Published in:Geophysical research letters 2007-02, Vol.34 (3), p.n/a
Main Authors: Kamesh Raju, K. A., Murty, G. P. S., Amarnath, Dileep, Kumar, M. L. Mohan
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
earthquakes
Exact sciences and technology
megathrust
tectonics
west Andaman fault
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Summary: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 et al. (2005) that WAF forms a lithospheric scale boundary and together with other tectonic elements modulate 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.
ISSN:0094-8276
1944-8007
DOI:10.1029/2006GL028730