岛弧—海沟系是世界上最活动的地震带,岛弧的地震活动是以既发生深源地震也发生巨大的浅源地震为特征。岛弧的浅源大地震发生在海沟向陆地一侧的地壳之下,表现为低角度的逆冲断层作用,它们可能是大陆岩石圈受到向下俯冲的大洋岩石圈拖曳作用而产生的弹性回跳的结果。研究表明,在它们的海岸带上,尤其是在太平洋周围,如阿拉斯加、日本、新西兰和其他许多岛屿上,逆冲断层地震引起了海岸地带突发的事件性滨线隆起或下沉,这些 The island arc-trough system is the most active seismic zone in the world. The seismic activity of the island arc is characterized by deep-source earthquakes and huge shallow earthquakes. The shallow-earthquakes with island arcs occur beneath the crust to the land side of the trench and behave as low-angle thrust faults that may have been caused by the drag-down of the continental lithosphere subducted by the continental lithosphere Jump results. Research shows that thrust thrusts on the coasts of the continent, especially around the Pacific Ocean, such as Alaska, Japan, New Zealand and many other islands, have triggered sudden outburst events along the coastline,