Crustal Structure of Andaman Islands using Joint Inversion of Receiver Functions and Surface Wave Dispersion Measurements

Autor:	Srichand Prajapati, Santosh Mishra
Rok vydání:	2020
Předmět:	Seismometer Subduction Inversion (meteorology) Crust Induced seismicity 010502 geochemistry & geophysics 01 natural sciences Geophysics Oceanic crust Surface wave Pre and post Geology Seismology 0105 earth and related environmental sciences
Zdroj:	Annals of Geophysics. 62
ISSN:	2037-416X 1593-5213
DOI:	10.4401/ag-8063
Popis:	We investigate the crustal structure of Andaman Islands, central part of Burma-Sunda-Java subduction complex, through joint inver- sion 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.
Databáze:	OpenAIRE
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