Refraction velocity models show a sedimentary cover of 13 km minimum beneath the shelf and 7 km minimum beneath the deep ocean.
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The crust is thinned continental crust, 10–20 km thick.
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The thinned continental crust is intruded by volcanics, sills and SDRs.
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Seismic velocities of 7.4 km/s found at the base of the crust is interpreted as magmatic underplating.
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The thinned continental crust extends from 19°N (northern Bay of Bengal) to 25°N (Shillong Plateau).
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