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Seismic tomography and velocity structure in the crust and upper mantle around Bohai Sea area

LI Zhi-Wei,XU Yi,HAO Tian-Yao,LIU Jin-Song,ZHANG LingInstitute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China  
Three-dimensional P wave velocity images of the crust and upper mantle beneath Bohai Sea and its adjacent regions are reconstructed through a tomographic inversion by using P wave arrival times from local and remote earthquakes,with a grid spacing of 0.5°×0.6° in latitude and longitude directions.The velocity images reveal an evident lateral heterogeneity of the curst and upper mantle of the Bohai Sea regions.Velocity anomalies in upper-mid crust reflect the character of surface geology: orogenic belt and uplift areas have high velocities,while depressions and sedimentary basins have low velocities;Widely-distributed low velocities in the mid-lower crust beneath North China correspond to high conductive layers in this region,which may be caused by partial-melting and magma activity.Velocity anomalies near Moho reflect the variation of crust thickness and the thermal state in crust-mantle boundary,while low velocity anomalies in uppermost mantle may be related with the upwelling of hot materials from asthenosphere.
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