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

Main Article Content

Santosh Mishra
Srichand Prajapati

Abstract

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.

Article Details

How to Cite
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), p. GT675. doi: 10.4401/ag-8063.
Section
Geodynamics and Tectonophysics