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primary topic: Crustal seismic structure beneath the Deccan Traps area (Gujarat, India), from local travel-time tomography

Crustal seismic structure beneath the Deccan Traps area (Gujarat, India), from local travel-time tomography
type: AcademicArticle
type: Article
abstract: The Gujarat region in western India is known for its intra-plate seismic activity, including the Mw 7.7 Bhuj earthquake, a reverse-faulting event that reactivated normal faults of the Mesozoic Kachchh rift zone. The Late Cretaceous Deccan Traps, one of the largest igneous provinces on the Earth, cover the southern part of Gujarat. This study is aimed at bringing light to the crustal rift zone structure and likely origin of the Traps based on the velocity structure of the crust beneath Gujarat. Tomographic inversion of the Gujarat region was done using the non-linear, passive-source tomographic algorithm, LOTOS. We use high-quality arrival times of 22,280 P and 22,040 S waves from 3555 events recorded from August 2006 to May 2011 at 83 permanent and temporary stations installed in Gujarat state by the Institute of Seismological Research (ISR). We conclude that the resulting high-velocity anomalies, which reach down to the Moho, are most likely related to intrusives associated with the Deccan Traps. Low velocity anomalies are found in sediment-filled Mesozoic rift basins and are related to weakened zones of faults and fracturing. A low-velocity anomaly in the north of the region coincides with the seismogenic zone of the reactivated Kachchh rift system, which is apparently associated with the channel of the outpouring of Deccan basalt. © 2016 Elsevier B.V..
date: 2016
volume: 672-67
is part of: Tectonophysics
status: peerReviewed
status: published
author list: authors
type: EPrint
type: ArticleEPrint
is part of: repository

Elsevier B.V.
type: Organization

Tectonophysics
type: Collection
issn: 00401951

E. Kukarina
type: Person
given name: E.
family name: Kukarina

S. Mishra
type: Person
given name: S.
family name: Mishra

S. Prajapati
type: Person
given name: S.
family name: Prajapati

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primary topic: Crustal seismic structure beneath the Deccan Traps area (Gujarat, India), from local travel-time tomography