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Deep Velocity Structure of Southeast Asia from Rayleigh Wave Group Velocities: 3D Isotropic Model of the S-Wave Velocity Distribution in the Upper Mantle

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Abstract

We present the results of studying the deep velocity structure of the crust and upper mantle beneath Southeast Asia based on data from a representative dataset of Rayleigh wave group velocity dispersion curves (about 6500 seismic paths) in the period range of 10–250 s. Group velocity distributions in separate periods and estimates of their lateral resolution are calculated using a two-dimensional tomography method developed for a spherical surface. From the obtained data, local dispersion curves are constructed and inverted to one-dimensional S-wave velocity sections up to a depth of 500 km. The constructed 3D isotropic model of the S-wave velocity distribution in the crust and upper mantle of the considered territory is characterized by higher or, in some cases, close lateral resolution versus previous surface-wave studies. The results show that the deep velocity structure of Southeast Asia is heterogeneous in the entire studied depth range. Nevertheless, the most contrasting S-wave velocity variations relate to the crust and uppermost mantle up to a depth of 250 km, where they are closely correlated with the geological structure of the considered area. Analysis of the constructed model allows us to trace differences in the deep velocity structure of marginal seas in the east of Asia and draw conclusions about the geodynamic processes in some regions the structure of which has been ambiguously determined.

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Filippova, A.I., Solovey, O.A. Deep Velocity Structure of Southeast Asia from Rayleigh Wave Group Velocities: 3D Isotropic Model of the S-Wave Velocity Distribution in the Upper Mantle. Geotecton. 55, 531–542 (2021). https://doi.org/10.1134/S0016852121040063

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