汶川Ms8.0地震前的潮汐变化分析
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摘要
为研究汶川8.0级大地震前的潮汐异常变化,选取距震中400 km以内的9个定点地壳形变观测台站的观测数据,对地震前的长序列观测资料进行了潮汐分析,发现潮汐参数震前出现超出2倍方差的异常反映,且距震中距离越近,异常变化幅度越大;NS分量异常呈先远后近的现象。
The data for 5 years observed at 9 fixed crustal deformation stations were used to calculate the tidal factor and phase delay series before the Wenchuan Ms8.0 earthquake.It is shown that at 7 stations there were abnomal changes before the earthquake.The nearer the station located to epicenteris,the greater of the abnormal signal.However the abnormal signal from the two stations were not obvious before the earthquak,one was Maoxian which is 100 km away from the earthquake and another was Kangding which is 200 km away from the earthquake.This fully demonstrates the complexity of earthquake precursors.
引文
1中国地震局监测预报司.地壳形变数字观测技术[M].北京:地震出版社,2003.
    2管泽霖,宁津生.地球形状及外部重力场[M].北京:测绘出版社,1981.
    3李正媛,等.川滇强震震源区形变潮汐短临变化特征[J].大地测量与地球动力学,2003,23((2):55-60.
    4唐九安,等.高村井水位潮汐参数的动态特征及其对大同地震的前兆响应[J].地震,1996,16(3):277-283.
    5陈德福,聂磊.液体静力水准仪及其应用[M].北京:地震出版社,2008.
    6王勇,等.1998年1月10日张北-尚义6.2级地震前昌平地震台资料的异常分析[J].西北地震学报,1999,21(3):274-279.

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