汶川Ms8.0地震前山西前兆低频前驱波特征分析
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摘要
对汶川Ms8.0地震前山西地区前兆测项变化进行了分析,认为震前前兆变化主要以低频前驱波为特征,其波动的优势周期为64~128分钟;异常点的展布方向与汶川地震主破裂方向一致;低频前驱波出现的时间具有丛集性特点,主要集中在5月11日14时至16时;研究还发现前兆测项对前驱波的响应能力与测点岩石的力学性质、观测仪器的频率特征、测点所处的构造部位有一定的关系。
The changes of some precursory observation in Shanxi area before Wenchuan Ms8.0 earthquake on May 12,2008 were analysed,and following conclutions are drawn.Firstly,the precursor waves of low frequent are main characters of the precursory change before the earthquake,and its superior period are 64-128 min.Secondly,the distribution of the abnormal points is in the same direction with the primary rupture of Wenchuan Ms8.0 earthquake.Thirdly,low-frequency precursory waves occured in a crowded time,mainly from 14 to 16 o'clock on the May 11 and the precursory observation's ability to respond to the precursory waves is related with the rock's mechanics nature of the observation point,the frequency characteristics of the observation apparatuses,and tectonic locations where the observations points are located.
The changes of some precursory observation in Shanxi area before Wenchuan Ms8.0 earthquake on May 12,2008 were analysed,and following conclutions are drawn.Firstly,the precursor waves of low frequent are main characters of the precursory change before the earthquake,and its superior period are 64-128 min.Secondly,the distribution of the abnormal points is in the same direction with the primary rupture of Wenchuan Ms8.0 earthquake.Thirdly,low-frequency precursory waves occured in a crowded time,mainly from 14 to 16 o'clock on the May 11 and the precursory observation's ability to respond to the precursory waves is related with the rock's mechanics nature of the observation point,the frequency characteristics of the observation apparatuses,and tectonic locations where the observations points are located.
引文
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2李冬梅,等.山西侯马台记录到的远强震前兆波特征浅析[J].大地测量与地球动力学,2002,22(3):75-77.
3刘序俨,等.福建井水位对汶川大地震体应变的响应[J].大地测量与地球动力学,2009,29(3):28-33.
4唐林波,等.强地震前兆低频波的实验研究[J].中国地震,2002,19(1):48-56.
5王赟赟,等.前驱地震波的实验研究及波谱分析[J].地震研究,2003,26(1):50-55.
6车用太,等.山西朔州水位的“前驱波”记录及其讨论[J].地震学报,2002,24(2):214-215.
7张淑亮,等.井-含水层系统对前驱波响应能力的分析[J].地震学报,2006,28(3):260-268.
8金春华,等.昆仑山口西8.1级强震前宁夏的地倾斜异常[J].大地测量与地球动力学,2003,23(2):61-64.
9许昭永,等.远场和超远场前兆的模拟实验研究[J].地震研究,2001,24(4):332-337.
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