Crustal structure of Andaman islands using joint inversion of receiver functions and surface wave dispersion measurements

Mishra, S. and Prajapati, S. (2020) Crustal structure of Andaman islands using joint inversion of receiver functions and surface wave dispersion measurements. Annals of Geophysics, 62 (6). ISSN 15935213

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Official URL: https://www.scopus.com/inward/record.uri?eid=2-s2....

Abstract

We investigate the crustal structure of Andaman Islands, central part of Burma-Sunda-Java subduction complex, through joint inversion of receiver functions and surface wave dispersion measurements. For this study, we used teleseismic earthquakes recorded over 13 temporary broadband seismographs operated in two different phases: pre and post 2004 Sumatra earthquake. Beneath the Andaman fore-arc region, the crustal thickness varies between ~24 and 28 km. The uppermost crust consists of ~4 to 7 km thick soft accretionary sed-iments. Average Vp/Vs ratio, between ~1.79 and 1.83, suggests accretionary hydrated oceanic crust with different level of saturation. Combining derived crustal structure with global seismicity and CMT fault plane solutions indicate a complex convergence along the arc, with transitional (continental-oceanic) type in the north to oceanic type in the south Andaman. © 2019 the Istituto Nazionale di Geofisica e Vulcanologia. All rights reserved.

Item Type: Article
Additional Information: cited By 2
Uncontrolled Keywords: crustal structure; crustal thickness; fault plane; oceanic crust; seismicity; Sumatra earthquake 2004; teleseismic wave; wave dispersion, Andamans; Andamans and Nicobars
Depositing User: Mr Ahmad Suhairi UTP
Date Deposited: 10 Nov 2023 03:28
Last Modified: 10 Nov 2023 03:28
URI: https://khub.utp.edu.my/scholars/id/eprint/14018

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