摘要
检验一个观测变化是否地震前兆异常,需要3个判据:1)有正常背景;2)非干扰影响;3)与地震相关。依据这3个判据,对汶川地震区周围"十五"期间新建立的四分量钻孔应变台站的数据进行分析,结果表明地震之前没有可靠的明显异常变化。进一步对地震前观测应变变化主方向的分析结果表明,它们并非都指向震中。
Following three criteria to testify the precursory anomaly before a great earthquake is adopted, 1 ） a normal background; 2） not interferences; 3 ） close correlation to the event. According to these criteria, no obvious abnormal changes related to the Wenchuan earthquake were found in preliminary investigation on the recordings of the 4-component borehole strainmeters installed in the Tenth Five Year Project of CEA. A further study on the principal orientations of strain changes before the great shock shows that they did not all point to the epicenter.
出处
《大地测量与地球动力学》
CSCD
北大核心
2009年第1期1-5,共5页
Journal of Geodesy and Geodynamics
基金
中央级基本科研业务专项(ZDJ2008-28)
关键词
汶川地震
四分量钻孔应变仪
异常变化
地震前兆
主方向
Wenchuan earthquake
4-component borehole strainmeter
anomalous change
earthquake precursory
principal orientation
