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《Chinese Journal of Geophysics》 2017-12
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Seismic shear-wave splitting characteristics in the crust in the area of Jinping reservoir of Sichuan and influences from water impoundment

SHAO Yu-Ping;GAO Yuan;DAI Shi-Gui;DU Yao;SONG Cheng;Institute of Reservoir Earthquake,Earthquake Administration of Sichuan Province;Institute of Earthquake Science,China Earthquake Administration;  
Using seismic data recorded by Yalong River network from August 1,2011 to December 31,2014 and 1 station of Sichuan seismic network from May 1,2008 to August 31,2015,the upper earth crust anisotropy parameters,namely the polarization of fast shear waves and time delay of slow shear waves were obtained in Sichuan Jiping reservoir by shear-wave Splitting Analysis Method(SAM).The results show that the spatial distribution of polarization of fast shear waves has the obvious localized characteristic.For example,the dominant polarization directions of fast shear waves from four stations in the left are more consistent with the regional principal compressive stress,while the polarization directions of fast shear waves from stations in the right are not the same.Moreover,the variation of the polarization directions of fast shear waves from MLI has good correlation with the water level of the reservoir.The polarizationdirections of fast shear waves had a 90 degree change when the water level increased rapidly to about 1800 meters in July 2013,which is known as a flip 90 degrees(90 degrees-flip)phenomenon.Further analysis speculates that the variation of the splitting characteristic of shear waves was induced by high pore pressure resulting from an increase in stress owing to impounding and possible water leakage.
【Fund】: 国家自然科学基金项目(41474032);; 地震科技星火计划项目(XH15036Y)资助
【CateGory Index】: P315
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【Citations】
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【Co-citations】
Chinese Journal Full-text Database 9 Hits
1 ZHU Tao;Institute of Geophysics,China Earthquake Administration;Key Laboratory of Seismic Observation and Geophysical Imaging,Institute of Geophysics,China Earthquake Administration;State Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration;;The depth of shear wave splitting anisotropy in the Yunnan region inferred from mantle convection simulation[J];地球物理学报;2018-03
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