强震前形变潮汐异常判识与机理研究

通过对永胜倾斜、侯马应变数字化固体潮汐观测资料的分析研究，认为当孕震系统进入失稳的临界状态时，微量级的形变突变可能受到引潮力的触发作用. 阶变异常与引潮力的方向、断层走向的剪应力的大小和方向有一定的相关性. 本文首次将形变异常与附加引潮力的关系进行研究，以探索临震前形变异常的物理机制及判识方法. 

RESEARCH ON DISTINGUISHING METHOD AND MECHANISM OF TIDAL DEFORMATION ANOMALIES BEFORE LARGE EARTHQUAKES

By analyzing the digital tilt tidal observations at Yongsheng station and strain tidal observations at Houma station, this paper suggests that tiny abrupt deformation might be triggered by the solid tidal force when the seismogenic system enters into an instable critical state. The step and abrupt changes correlate to a certain extent to the direction of tidal force and the orientation & size of tidal shear stress along the fault strike. In the paper, we study for the first time the relationship between deformation anomaly and additional tidal force in order to approach the physical mechanism of anomalies appeared immediately before earthquakes and the distinguishing method.