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sks splitting beneath Capital area of China

Earthquake Science 2008年第6期21卷 553-561+673页

作者：常利军王椿镛丁志峰 Institute of Geophysics China Earthquake Administration

Based on the polarization analysis of teleseismic sks waveform data recorded at 49 seismic stations in Capital Area Seismograph Network,the sks fast-wave direction and the delay time between the fast and slow shear waves at each station were determined by using the grid searching method of minimum transverse energy and the stacking analysis method,and then we acquired the image of upper mantle anisotropy in Capital *** the study area,the fast-wave polarization direction is basically WNW-ESE,and the delay time falls into the interval from 0.56 s to 1.56 *** results imply that the upper mantle anisotropy in Capital area is mainly caused by the subduc-tion of the Pacific plate to Eurasian *** subduction has resulted in the asthenospheric material deformation in Capital area,and made the alignment of upper mantle peridotite lattice parallel to the deformation *** the collision between the Indian and Eurasian plates made the crust of western China thickening and uplifting and material eastwards extruding,and then caused the upper mantle flow eastwards,and made the upper mantle de-formation direction parallel to the fast-wave *** deformation model of the crust and upper mantle is possibly vertically coherent deformation by comparing the fast-wave polarization direction with the direction of lithospheric extension and the GPS velocity direction.

关键词： Capital area sks wave anisotropy fast-wave direction deformation

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Upper mantle anisotropy in the Ordos Block and its margins

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Science China Earth Sciences 2011年第6期54卷 888-900页

作者： CHANG LiJun WANG ChunYong DING ZhiFeng Institute of Geophysics China Earthquake Administration Beijing 100081 China

Based on the polarization analysis of teleseismic data,sks (SKKS) fast-wave directions and delay times between fast and slow shear waves were determined for each of the 111 seismic stations from both permanent and temporary broadband seismograph networks deployed in the Ordos Block and its *** the Silver and Chan and stacking analysis methods were *** this way,an image of upper mantle anisotropy in the Ordos Block and its margins was *** the western and northern margins of the Ordos Block,the fast-wave directions are consistently *** fast-wave directions are mainly NWW-SEE and EW in the southern margin of the Ordos *** the eastern margin of the Ordos Block,the fast-wave directions are generally EW,although some run NEE-SWW or *** the Ordos Block,the fast-wave directions trend near N-S in the north,but switch to near EW in the *** delay time between fast and slow waves falls into the interval 0.48-1.50 s,and the average delay time at the stations in the Ordos Block is less than that in its *** suggest that the anisotropy of the stable Ordos Block is mainly caused by "fossil" anisotropy frozen in the ancient North China *** NE-trending push of the northeastern margin of the Tibetan Plateau has caused NW-SE-trending lithospheric extension in the western and northern margins of the Ordos Block,and made the upper mantle flow *** in turn has resulted in the alignment of the upper mantle peridotite lattice with the direction of material *** the southern margin of the Ordos Block,the collision between the North China and Yangtze blocks resulted in the fast-wave direction running parallel to the collision boundary and the Qinling *** this with the APM and velocity structure of the Qinling Orogen,we propose that eastward-directed asthenospheric-mantle channel flow may have occurred beneath the Qinling *** the eastern margin of the Ordos Block,the complex anisotropic charac

关键词： Ordos Block upper mantle anisotropy sks wave fast-wave direction lithosphere deformation

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