摘要
在对山西大同—阳高 1989年 6 .1级地震的震例总结中 ,共收集了 2 3项形变异常 ,经过对资料的整理研究 ,又发现了 13项。经过进一步总结形变异常的演化特征及物理机制 ,表明形变异常在震前具有多样性 ,震源区出现了闭锁现象。中期趋势异常主要受区域应力场的控制 ,短临异常反映了震源应力场的变化 。
In the previous study about the Datong Yanggao Ms 6.1 earthquake ,23 ground deformation anomalies were worked out.13 new ground deformation anomalies are found by the reanalysis of the data. A new study based on the evolution characteristics and the physical mechanisms of the ground deformation anomaly shows that the anomalies appeared before the earthquake are of multiformity. The locking presents in the source region. The medium term anomalies are mainly controlled by the regional stress field and the short impending anomalies are related to the changes of the stress around the source. The abnormal spatial distribution of the ground deformation is resulted from the interaction between the regional stress field and the stress field around the source.
出处
《山西地震》
2001年第1期1-8,共8页
Earthquake Research in Shanxi
