日本Mw9.0级地震引起的井-含水层系统参数变化及其机理研究

2011年3月11日日本Mw9.0级地震引起了中国大陆水位观测井大范围的同震响应现象，且多项井水位动态在震前、震后出现明显差异，这种差异反映了区域井-含水层系统参数的变化。本项目拟基于中国大陆地震地下流体水位观测网数据，选取在日本Mw9.0级地震时出现同震响应的观测井，分析其水位在地震前后的动态变化并反演其井-含水层系统参数，在探讨各参数可靠性的基础上分析其变化特征与井孔条件、含水层岩性、构造环境等因素的相关性和形成机理，进而分析远场强震引起的井-含水层系统参数变化在“一震多井”和“一井多震”情况下的差异性和共性特征。本项目的实施将为水位同震响应机理研究提供科学依据，为分析日本Mw9.0级地震对中国大陆主要断裂带的动态应力加载作用提供新途径，更有助于理解地下水在地震孕育过程中的异常变化，提高对地震孕育过程中地下水前兆现象的认识。

Mw9.0 earthquake on March 11, 2011 Japan caused a wide range of seismic response of well level in Chinese Mainland. And multiple water-level in well has a significant difference before and after the event, the difference reflects the well - aquifer system parameter changed. This project will use the data of Chinese Mainland Water-level Observation, select the wells with co-seismic induced by Mw9.0 earthquake, analyzes the changes of groundwater level before and after the earthquake, calculate of the well aquifer system parameters. We will discuss the reliability of the parameters, the relationship of the parameters and the hole condition, the aquifer lithology and tectonic environment factors. We will also analyses the difference and common features in well aquifer system parameter changes between Mw9.0 earthquake and other far-field earthquakes. The implementation of this project will provide a scientific basis for water co-seismic response mechanism, and apply a new approach for analyze the dynamic stress loading effect of the faults in Chinese Mainland, induced by Mw9.0 earthquake. The results of this project will help to understand the abnormal change of groundwater in the seismogenic process.