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Seismic-reflection images of the crust beneath the 2001 M = 7.7 Kutch (Bhuj) epicentral region, western India

D. Sarkar, K. Sain, P. R. Reddy, R. D. Catchings and Walter D. Mooney
Seismic-reflection images of the crust beneath the 2001 M = 7.7 Kutch (Bhuj) epicentral region, western India (in Continental intraplate earthquakes; science, hazard, and policy issues, Seth Stein (editor) and Stephane Mazzotti (editor))
Special Paper - Geological Society of America (2007) 425: 319-327

Abstract

Three short ( approximately 35 km) seismic-reflection profiles are presented from the region of the 2001 Mw = 7.7 Bhuj (western India) earthquake. These profiles image a 35-45-km-thick crust with strong, near-horizontal reflections at all depths. The thickness of the crust increases by 10 km over a distance of approximately 50 km from the northern margin of the Gulf of Kutch to the earthquake epicenter. Aftershocks of the Bhuj earthquake extend to a depth of 37 km, indicating a cold, brittle crust to that depth. Our results show that all of these aftershocks are contained within the crust. Furthermore, there is no evidence for offsets in the crust-mantle boundary associated with deep (mantle) faulting. The existence of a thick ( approximately 45 km) and highly reflective crust at the epicentral zone may be indicative of crustal thickening due to the compressive regime of the past 55 m.y. Alternatively, this crustal thickening could be attributable to magmatic intrusions that date back to Mesozoic rifting associated with the breakup of Gondwanaland.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 425
Title: Seismic-reflection images of the crust beneath the 2001 M = 7.7 Kutch (Bhuj) epicentral region, western India
Title: Continental intraplate earthquakes; science, hazard, and policy issues
Author(s): Sarkar, D.Sain, K.Reddy, P. R.Catchings, R. D.Mooney, Walter D.
Author(s): Stein, Setheditor
Author(s): Mazzotti, Stephaneeditor
Affiliation: National Geophysical Research Isntitute, Hyderabad, India
Affiliation: Northwestern University, Department of Earth and Planetary Sciences, Evanston, IL, United States
Pages: 319-327
Published: 2007
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-5137-2425-6
References: 54
Accession Number: 2008-040032
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
N20°00'00" - N24°49'60", E68°00'00" - E74°30'00"
Secondary Affiliation: Geological Survey of Canada, CAN, CanadaU. S. Geological Survey, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200812
Program Name: USGSOPNon-USGS publications with USGS authors
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