【摘要】 本文以郯庐断裂带中南段及周缘为研究区，计算和收集了1970—2016年1148次地震震源机制解，采用阻尼应力张量方法反演了构造应力场，通过分析应力场时空动态变化过程和地震活动性特征，探讨了2011年3月11日日本9.0级地震对郯庐断裂带中南段及周缘的影响.结果显示：9.0级地震对郯庐断裂带中南段及周缘造成了显著影响，表现为应力场出现扰动变化和地震活动显著增强.以挤压为主的背景应力场呈现出一定的拉张作用，应力结构及应力方向发生变化，最大主应力σ₁轴倾伏角增大，中等主应力σ₂轴倾伏角减小，最大主应力σ₁轴方向发生小幅逆时针偏转.包括研究区在内的中国陆地东部地区地震活动显著增强，中强地震丛集活动.应力场扰动变化和地震起伏活动存在较好的相关性，并先后呈现出3个不同阶段，扰动导致的构造应力作用方式的阶段性改变是地震活动增强的动力机制.结果还显示，应力场扰动变化和地震活动增强开始于9.0级地震前1～2年，揭示了9.0级地震的影响不仅限于同震和震后，在其孕震后期已经对远场的中国陆地东部产生了影响.本文结果可以为日本俯冲带大震对中国陆地构造活动影响的相关研究提供参考依据.更多还原

【Abstract】 Taking the middle-southern segment of Tan-Lu fault zone and its periphery as the study area, the paper calculated and obtained the focal mechanism of 1148 earthquakes in the study area during 1970—2016, and inverted the tectonic stress field with the damping stress tensor method, it discussed the influence of the M_W9.0 earthquake in Japan on the middle-southern segment of Tan-Lu fault zone and its periphery, based on the analysis of temporal and spatial dynamic change process of stress field and the characteristic of seismicity. The result shows that M_W9.0 earthquake in Japan has a significant impact on the middle-southern segment of Tan-Lu fault zone and its surrounding areas, showing disturbance change of stress field and significant increase of seismic activity. The background stress field, which is dominated by extrusion, presents a certain tension effect, and the stress structure and stress direction has changed. The maximum principal stress σ₁-axis plunge increased, The medium principal stress σ₂-axis plunge decreased, and the maximum principal stress σ₁-axis deflected slightly counterclockwise. There are a series of significant medium-strong seismic cluster activities in Eastern China, including the study area. There is a good correlation between disturbance variation of stress field and seismic fluctuation activity, and it shows 3 different stages. The periodic change of tectonic stress action caused by disturbance is the dynamic mechanism of increased seismicity. The results also show that the disturbance of stress field and increase of seismic activity started 1～2 years before the M_W9.0 earthquake in Japan. It reveals that the influence of the Japan earthquake is not limited to coseismic and post-earthquake. It has already had an impact on eastern China continent in the late period of earthquake preparation. The results can provide a reference for the study of the influence of the Japanese subduction zone earthquake on the tectonic activity of the Chinese mainland.更多还原