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3-D S-wave velocity structure of crust and upper-mantle beneath the northeast China

PAN Jia-Tie;LI Yong-Hua;WU Qing-Ju;YU Da-Xin;Institute of Geophysics,China Earthquake Administration;  
By using the vertical component of continuous data,recorded by 159 permanent stations from January 2011 to June 2012 and 27 portable stations from January 2011 to June 2011 in northeast China(NEC),the pure path group and phase velocity dispersion curves of Rayleigh wave at short periods(8 — 30 s) were obtained by ambient noise tomography in the study area(105°E—135°E,39°N—52°N).Besides,the pure path group velocity of Rayleigh wave at longer periods(36—145 s) obtained from surface wave tomography were jointly used to invert for the 3-D S-wave velocity structure of crust and upper mantle above the depth of 200 km beneath NEC,and the lithospheric thickness map was presented.This study shows that the S-wave velocity structures in the middle and lower crust on the two sides of the Da Hinggan Ling gravity gradient line are very different? obvious high speed is observed to the east while obvious slow speed is observed to the west in large areas.The lithospheric mantle beneath the Songliao Basin is imaged with remarkable high speed;the depth of the lithospheric mantle bottom interface may be 90-100 km.Here the thin lithosphere lid may imply that lithospheric thinning may have occurred in NEC.A wide range of relatively slow-speed characteristics is imaged around Tanlu fault in upper mantle,indicating that there may be hot material up-welling beneath the faults.
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