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板块构造的运动和动力学是地学研究的前沿课题 .板块边缘强震是板块运动的直接结果 .分析 1 982年日本茨城地震序列发现 ,震源断层面存在分阶段沿走向扩展、倾向调整的特殊图象 .结合震源机制的走向、倾向以及滑动方向等资料 ,确认属于日本海沟下方的俯冲带逆冲地震 .文中讨论了地震序列过程的成因 ,认为采用介于年尺度的空间大地测量结果与秒尺度的强震矩张量分析之间的地震序列时空分布研究 ,表明太平洋板块向欧亚板块局部下方俯冲的动态过程 .根据地震平均错距和板块运动速度 ,推测近年当地可能再次发生强震
The motion and dynamics of plate tectonics are the frontiers of geosciences research.The strong edge of the plate margin is the direct result of the plate motion.It is found from the 1982 Ibizan earthquake sequence in Japan that the focal fault has a special map In the paper, the origin of the subduction zone thrust belts belonging to the Japan Trench is identified by combining the trend, orientation and sliding direction of the focal mechanism, etc. The paper discusses the causes of the seismic sequence process, and considers that the spatial geodetic measurements at the annual scale and the secular scale The study on the temporal-spatial distribution of seismic sequences between strong moment tensor analysis shows that the Pacific plate subducts beneath the Eurasian plate.According to the average seismic offset and plate motion velocity,