P-Wave Velocity Structure of Crust and Upper Mantle in East Asia and West Pacific Marginal Seas

doi:10.7523/j.issn.2095-6134.2005.3.011

Abstract

Abstract:

3-D velocity structure of crust and upper mantle beneath the East Asia and West Pacific marginal seas (60bE~ 150bE, 10bS~ 60bN) down to the depth of 300km has been studied by using a total of 170550 P-wave first arrival times from the ISC bulletin, which are selected from 12500 events and 928 seismic stations within the studying areas. The result is given with the resolution of grid spacing of 2b@ 2b. The preliminary results show: (1) The P-wave velocity structure is so different between the eastern part and western part of the East Asia and West Pacific marginal seas by the boundary of 108bE. The western part isthe thickening convergent lithosphere caused by Indian subcontinent colliding with the Eurasian continent, and the eastern part is a disassembly causing the lithosphere thinning and extension arising from intrusion of asthenospheric material. (2) The crust and lithosphere of the Tibet is very thick, and the LVZ is not obvious. The Indian subcontinent dived to the beneath of the Tibet. (3) There are the high-velocity anomalies beneath the Japan Sea and the Philippines Sea. It could be the evidence that the Pacific slab dived to this area.

Key words: the East Asia and West Pacific marginal seas, the crust and the upper mantle, P-wave 3-D velocity structure

CLC Number:

P315

QU Chen, ZHOU Hui-Lan. P-Wave Velocity Structure of Crust and Upper Mantle in East Asia and West Pacific Marginal Seas[J]. , 2005, 22(3): 329-340.

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