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The June 2010 Nicobar earthquake; fault reactivation on the subducting oceanic plate

K. Rajendran, V. Andrade and C. P. Rajendran
The June 2010 Nicobar earthquake; fault reactivation on the subducting oceanic plate
Bulletin of the Seismological Society of America (October 2011) 101 (5): 2568-2577


The approximately 1300-km-long rupture zone of the 2004 Andaman-Sumatra megathrust earthquake continues to generate a mix of thrust, normal, and strike-slip faulting events. The 12 June 2010 M (sub w) 7.5 event on the subducting plate is the most recent large earthquake on the Nicobar segment. The left-lateral faulting mechanism of this event is unusual for the outer-rise region, considering the stress transfer processes that follow great underthrusting earthquakes. Another earthquake (M (sub w) 7.2) with a similar mechanism occurred very close to this event on 24 July 2005. These earthquakes and most of their aftershocks on the subducting plate were generated by left-lateral strike-slip faulting on north-northeast-south-southwest oriented near-vertical faults, in response to north-northwest-south-southeast directed compression. Pre-2004 earthquake faulting mechanisms on the subducting oceanic plate are consistent with this pattern. Post-2004, left-lateral faulting on the subducting oceanic plate clusters between 5 degrees N and 9 degrees N, where the 90 degrees E ridge impinges the trench axis. Our study observes that the subducting plate off the Sumatra and Nicobar segments behaves similarly to a chip of the India-Australia plate, deforming in response to a generally northwest-southeast oriented compression, an aspect that must be factored into the plate deformation models.

ISSN: 0037-1106
EISSN: 1943-3573
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 101
Serial Issue: 5
Title: The June 2010 Nicobar earthquake; fault reactivation on the subducting oceanic plate
Affiliation: Indian Institute of Science, Centre for Earth Sciences, Bangalore, India
Pages: 2568-2577
Published: 201110
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 35
Accession Number: 2011-103263
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch maps
N10°30'00" - N13°45'00", E92°19'60" - E93°00'00"
N06°30'00" - N09°00'00", E92°19'60" - E93°45'00"
S06°00'00" - N05°45'00", E95°04'60" - E106°10'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201152
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