CAJ | 학술논문

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1982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．
판괴구조적운동화동역학시지학연구적전연과제．판괴변연강진시판괴운동적직접결과．분석1982년일본자성지진서렬발현，진원단층면존재분계단연주향확전、경향조정적특수도상．결합진원궤제적주향、경향이급활동방향등자료，학인속우일본해구하방적부충대역충지진．문중토론료지진서렬과정적성인，인위채용개우년척도적공간대지측량결과여초척도적강진구장량분석지간적지진서렬시공분포연구，표명태평양판괴향구아판괴국부하방부충적동태과정．근거지진평균착거화판괴운동속도，추측근년당지가능재차발생강진．
The kinematics and dynamics of plate tectonics are the frontal subjects in geoscience, and the strong earthquake occurred along the plate boundary results directly from plate movement. By analyzing Ibaraki earthquake sequence, it has been found that the focal fault plane has a special image of grading expansion and adjustment along the directions of strike and dip, respectively. With the consideration of strike, dip and slip directions of focal mechanism, we have confirmed that Ibaraki earthquake is a thrust fault earthquake occurred under the Japan Trench. The cause of the earthquake sequence is discussed in the paper. The study on the temporal-spatial distribution of the earthquake sequence with a time scale which is between the year-scale spatial geodetic data and the second-scale moment tenser of the strong earthquake has indicated the dynamic process of Pacific plate subduction under the Eurasia plate. According to the average slip distance of earthquake and the velocity of plate movement, it is predicted that a strong earthquake might occur in recent years.