四分量钻孔应变台网汶川地震前的观测应变变化
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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.
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.
引文
1邱泽华,石耀霖.国际钻孔应变观测的发展现状[J].地震学报,2004,26(增刊):162-168.
2池顺良,武红岭,骆鸣津.钻孔应变观测中潮汐因子离散性与各向异性原因探讨——“十五”数字地震观测网络分量钻孔应变仪首批观测资料分析解释[J].地球物理学进展,2007,22(6):1 746-1 753.
3邱泽华,石耀霖,欧阳祖熙.四分量钻孔观测的实地相对标定[J].大地测量与地球动力学,2005,25(1):118-122.
4黄湘宁,李建春,赵淑贞,地应力测量结果与分析[A].1976年唐山地震[C].北京:地震出版社,1982.
5邱泽华,等.四分量钻孔应变观测资料的换算和使用[J].地震,2008,待刊.
2池顺良,武红岭,骆鸣津.钻孔应变观测中潮汐因子离散性与各向异性原因探讨——“十五”数字地震观测网络分量钻孔应变仪首批观测资料分析解释[J].地球物理学进展,2007,22(6):1 746-1 753.
3邱泽华,石耀霖,欧阳祖熙.四分量钻孔观测的实地相对标定[J].大地测量与地球动力学,2005,25(1):118-122.
4黄湘宁,李建春,赵淑贞,地应力测量结果与分析[A].1976年唐山地震[C].北京:地震出版社,1982.
5邱泽华,等.四分量钻孔应变观测资料的换算和使用[J].地震,2008,待刊.
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