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本文用动态平差法计算海城7.3级地震前后的地壳形变资料,阐述了地形变的过程和特征。震前垂直形变场沿节线分区;震中邻近地区有快速形变现象,有些断层发生过蠕动。地震引起的最大垂直形变为-192毫米;最大线应变为-1.07×10~4;震中区地应变参数具有四象限分布的特征;形变符合弹性回跳模型。震后形变方向与震时相反,受构造控制有明显的分区差异,且以断层蠕动为主。
In this paper, crustal deformation data before and after the Haicheng MS 7.3 MS are calculated by dynamic adjustment method, and the process and characteristics of the terrain deformation are expounded. The vertical deformation field before the earthquake was divided along the pitch line. Rapid deformation was observed in the vicinity of the epicenter, and some faults had peristalsis. The maximum vertical strain caused by the earthquake was -192 mm. The maximum linear strain was -1.07 × 10 ~ 4. The geomechanical parameters of the epicenter had four quadrant distribution characteristics. The deformation accorded with the elastic bounce model. After the earthquake, the direction of deformation was opposite to that of the epicenter, which was obviously divided by the tectonic control. The main fault was peristalsis.