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《Seismology and Geology》 2009-04
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STUDY ON THE CHARACTERISTICS OF FOCAL MECHANISMS OF RESERVOIR INDUCED EARTHQUAKES AND STRESS FIELD IN THE LONGTAN RESERVOIR AREA

CHEN Han-lin~(1)) ZHAO Cui-ping~(1)) XIU Ji-gang~(2)) CHEN Zhang-li~(2)) 1) Institute of Earthquake Science,China Earthquake Adiministration,Beijing 100036,China 2) China Earthquake Administration,Beijing 100036,China  
The FOCMEC method was adopted to resolve focal mechanisms for earthquakes occurring from Sep.2006 to the end of 2008 in the range of Longtan reservoir by using the first P polarization and SH/P amplitude ratio from earthquake waveforms recorded by the Longtan reservoir seismic network. Then,the stress field of the reservoir area was inversed.According to the results,most of the M_L≥2.0 earthquakes are of thrust faulting since the impoundment in Oct.2006.The stress fields in both the cluster A and B are oriented in NWW-SEE direction and almost horizontal,indicating that the horizontal compressive stress is still the dominant stress after the impoundment,and the dip angle of the maximum principal compressive stress is more horizontal than that before impoundment.However,the middle and minimum stress axes are somewhat inconsistent in the two clusters,which indicates the local disturbance of stress field.The genesis of reservoir induced earthquake is supposed as the coupling of pore pressure action with the fluid lubricating and weakening action under the loading,whereas the increase of shear stress due to water loading is not the causation of reservoir induced earthquake.
【Fund】: “十一五”国家科技支撑计划项目(2006BAC01B040201)资助
【CateGory Index】: P315.33
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