通过探测地震所引起的地表形变是研究地震的发震机制，进而为地震预报提供科学依据的有力途径。
The research of detecting the surface displacement caused by earthquake to study the earthquake mechanism will provide scientific knowledge to earthquake prediction.
它是指在由发震构造引起的垂直运动为主的地表形变场中，水平方向上单位距离内垂向速率变化的物理量。
They are the changing values of vertical velocity per unit distance along the horizonal direction on the sur-facial deformation field in which crustal vertical movement is dominant.
火山区存在的震群活动、部分台站观测到的S波阴影区以及地表的缓慢抬升等，指示火山区存在一个岩浆系统。
The existing of earthquake swarm, S wave shadow in some seismic stations and gradually uplifting of surface suggest a magma system beneath these volcanoes.
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