辽宁省凌海M_L4.1地震前兆异常特征分析
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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.
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.
引文
[1]国家地震局科技监测司,编著.首都圈地震短临预报新方法观测与研究[M].地震出版社,1994,8-9
[2]蒋骏、李胜乐、章雁滨等.地震前兆信息处理与软件系统[M].中国地震局监测预报司,1999年
[3]张凌空.体应变观测中的气压干扰机制和排除方法的研究[J].地震,1996,vol.16,NO.2,144-151
[4]马宗晋、高旭、丁鉴海等.渐进式地震预报及其三个理论问题的讨论[J].地震科学研究,1981,(1).
[5]张跃刚、王宝坤、王占勇.张北6.2级地震前河北北部的地壳形变异常[J].华北地震科学,1998,(3).
[2]蒋骏、李胜乐、章雁滨等.地震前兆信息处理与软件系统[M].中国地震局监测预报司,1999年
[3]张凌空.体应变观测中的气压干扰机制和排除方法的研究[J].地震,1996,vol.16,NO.2,144-151
[4]马宗晋、高旭、丁鉴海等.渐进式地震预报及其三个理论问题的讨论[J].地震科学研究,1981,(1).
[5]张跃刚、王宝坤、王占勇.张北6.2级地震前河北北部的地壳形变异常[J].华北地震科学,1998,(3).
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