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.
Highlights
The Andaman Islands are part of the AndamanNicobar Ridge (ANR) which hosts Andaman and Nicobar group of Islands
Global plate tectonic reconstructions suggest the complex convergence of Indian plate along Southeast Asian margin, which has resulted in clockwise rotation of the subduction zone and increase in the obliquity [Replumaz et al, 2010]
To follow the geometry of the subducting slab, crustal thickness estimates obtained from joint inversion is interpreted together with hypocentral locations, fault plane solutions and piercing points
Summary
The Andaman Islands are part of the AndamanNicobar Ridge (ANR) which hosts Andaman and Nicobar group of Islands These Islands mark the eastern margin of the Indian plate and form an important transitional tectonic link between the eastern Himalayan syntaxis in the north and Sunda arc in south. Global plate tectonic reconstructions suggest the complex convergence of Indian plate along Southeast Asian margin, which has resulted in clockwise rotation of the subduction zone and increase in the obliquity [Replumaz et al, 2010].
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