摘要
本文利用前兆通用异常分析方法,通过提取2009年11月8日辽宁凌海ML4.1地震前锦州台形变短临异常信息,探讨了震前震源区附近的应力状态及异常形态特征,同时对异常演化形态的物理机制进行了分析。结果表明:震前异常特征表现形式为应变固体潮曲线的畸变,日均值曲线经过处理后出现的张性或压性的超出2倍均方差的脉冲异常;倾斜为分量曲线打破正常变化趋势、转向加速、矢量曲线打结等异常。
Based on the general analysis method on the precursory anomalies,this paper took the shortimpending anomalies of the deformation in Jinzhou seismic station before Linghai ML4.1 earthquake on Nov.8th,2009 for example,and discussed the stress state,anomaly characteristics around the focal region before the earthquake occurred and the physical mechanism of the anomaly evolution’ s state.The results showed that the strain tide curves are the main anomaly characteristics before the earthquake,the tensibility or piezotropy appeared after dealing with the daily mean value had been overstepped twice as much as mean square deviation of the pulse anomaly.The incline represented the anomalies of breaking the normal trend by component curves,turning acceleration,vector knotting curves and so on.
出处
《防灾减灾学报》
2010年第3期61-68,共8页
Journal of Disaster Prevention And Reduction
关键词
辽宁凌海地震
锦州地震台
形变异常特征
物理机制
Liaoning Linghai earthquake
Jinzhou Seismic Station
deformation anomaly characteristic
physical mechanism
