张渤带形变预测指标分析

根据张渤带震例研究成果, 系统清理1966年以来张渤带5级以上地震前形变异常变化的各项特征, 初步归纳出张渤带的形变预测指标。 主要指标为: 张渤带5.6~6.2级地震异常相对集中, 异常主要集中在110~270 km范围; 潮汐类、 突变类异常数量相对较少; 破年变类异常较多, 异常主要对应4.5~5级和6~6.5级地震, 异常对应范围主要为100~300 km; 趋势转折类异常主要对应5.5~6.5级地震, 且异常时间在4.5~6.5级范围内有随震级增大而增加的趋势。

Analysis of Deformation Prediction Index for the Zhangjiakou-Bohai Seismic Belt

Based on earthquake cases in the Zhangjiakou-Bohai seismic belt, a systematic study of deformation anomalies before M≥5.0 earthquakes from 1966 tothe present was carried out. We initially conclude that deformation anomalies relatively concentrate from M5.6 to 6.2 earthquakes, and concentrate from 110 to 270 km in space. There is relatively small number of tidal anomalies and mutation anomalies. There is relatively more number of annual variation anomalies, and the anomalies are corresponding to the earthquakes from M4.5 to M5.0 and M6.0 to M6.5, and the anomaly extension is 100~300 km. The trend transition anomalies are corresponding to the M5.5 to 6.5 earthquakes, and the anomalous time increases with the increase of magnitude in the range of 4.5~6.5.