库车5.6级、拜城5.3级地震形变前兆异常
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摘要
分析研究了 1999年 3月 15日库车 5.6级、6月 17日拜城 5.3级地震前新疆克孜尔水库形变站观测到的前兆异常。库车 5.6级地震前 ,第一形变站基线具有突变性 ,异常幅度达 2 80μm,水准异常为渐进式 ,幅度稍小 ,但异常持续时间较长。在此次地震前其它测站的 14条垂直、水平形变测线都有程度不同的异常显示 ,最大异常量级为 1.2× 10 -5,中期异常达 1年以上 ,短期异常持续约 10 0天 ,临震异常在震前 7～ 15天出现。拜城 5.3级地震前各测线也观测到了较明显的前兆异常 ,最大异常量级为 8.3× 10 -6,短期异常持续近两个月。
Before the Kuche (M=5.6,Mar.15,1999)and Baichen (M=5 .3,June 17,1999)earthquakes,the deformation anomalies were observed at Kizil,Xinjiang,Reservoir Deformation Sta tion.Before the Kuche earthquake,the baseline value at the First Deformation Sta tion suddenly changed,and the amplitude amounted to 280 μm;the leveling value changed progressively,the magnitude was small but the duration was long.14 vert ical and horizontal survey lines at other stations also showed various degrees of anomalies before the quake,the maximum amplitude to 1.2×10- -5.The m edium-term anomaly of the Kuche earthquake lasted more than one year,short-ter m anomaly about 100 days,and impending anomaly appeared 7~15 days before the sh ock.There were also anomalies appearing before the Baichen earthquake, and the m aximum anomaly amount was 8.3×10- -6,short-term anomaly near 2 months.
Before the Kuche (M=5.6,Mar.15,1999)and Baichen (M=5 .3,June 17,1999)earthquakes,the deformation anomalies were observed at Kizil,Xinjiang,Reservoir Deformation Sta tion.Before the Kuche earthquake,the baseline value at the First Deformation Sta tion suddenly changed,and the amplitude amounted to 280 μm;the leveling value changed progressively,the magnitude was small but the duration was long.14 vert ical and horizontal survey lines at other stations also showed various degrees of anomalies before the quake,the maximum amplitude to 1.2×10- -5.The m edium-term anomaly of the Kuche earthquake lasted more than one year,short-ter m anomaly about 100 days,and impending anomaly appeared 7~15 days before the sh ock.There were also anomalies appearing before the Baichen earthquake, and the m aximum anomaly amount was 8.3×10- -6,short-term anomaly near 2 months.
引文
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2 郭增建 ,秦保燕 .灾害物理学 [M].西安 :陕西科学技术出版社 ,1 989.
3 杨志荣 .新疆乌什 6.4级地震形变异常特征 [J].地壳形变与地震 ,1 990 ,1 0 ( 1 ) :98～ 1 0 4 .
4 力武常次 .冯 锐 ,周新华译 .地震预报 [M].北京 :地震出版社 ,1 978.
5 杨志荣 ,黄宗英 .几次强震前形变前兆异常形态特征的对比观测研究 [J].内陆地震 ,1 996,1 0 ( 1 ) :3 1～ 4 0 .
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