锦屏一级电站水库孕震环境及发震机制研究

Studying on the seismogenic environment and mechanism of reservoir-induced earthquakes is the important foundation of conducting risk evaluation.In this study, we use "Matched filtering technology" to detect reservoir earthquake events waveform to improve earthquake catalog and integrity of the earthquake sequence.We Combinate "Matched filtering technology", "waveform cross-correlation technique" and the double difference relocation method to improve the accuracy of the earthquake location results and get more comprehensive reservoir seismic activity.we estimate wave velocity variation in reservior area acorrding three-dimensional tomograph imaging research to study underground medium density and water saturation change in different regions, time and depth. By research of focal mechanism, stress field inversion and some source parameters estimation, we can know more about mechanical condition and mechanics of earthuakes and seismogenic stress field changing in different regions and time. Based on the above parts research, combined with the reservoir water level changes, reservoir lithology, geological and hydrological structure and compared to other reservoirs, research Jinping reservoir seismogenic environment and earthquake mechanism.

水库诱发地震的孕震环境与机理研究是开展水库地震危险性评估的重要基础。本研究将通过应用“匹配滤波技术”到水库震群事件波形的检测当中以完善地震目录，提高地震序列的完整性；通过“匹配滤波技术”、“波形互相关技术”与双差定位法相结合来提高地震定位的准确性，得到更全面的水库地震活动性研究结果；通过水库库区介质三维速度成像研究，来研究库区下方介质不同区域的波速变化，以了解一定程度的不同区域、不同时间段、不同深度的地下介质密度变化以及地下流体的变化；通过震源机制解、应力场反演及一些震源参数的计算，以研究在不同区域和不同时间的力学条件、发震物理机制及应力场背景的变化；综合以上几部分研究内容，并结合库区水位变化、库区岩性特征、地质结构与水文环境资料以及其他水库的一些对比，研究锦屏库区的孕震环境与发震机理。