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永登5.8级地震前后剪切波分裂特征
引用本文:张范民,李清河,荣代潞.永登5.8级地震前后剪切波分裂特征[J].西北地震学报,1998,20(3):9-15.
作者姓名:张范民  李清河  荣代潞
作者单位:中国地震局兰州地震研究所
摘    要:应用1990年至1995年CDSN台网兰州数字台的记录和中法合作建立的朗索数字台的记录,研究了1995年7月22日甘肃永登5.8级地震前后剪切波分裂的特征,利用最大特征值法,波形识别算子法和最大似然法定量确定了剪切波分裂的快慢波时间延迟及快波偏振方向,结果表明,在永登地震前大约1年的时间内剪切波分裂延迟增大,快剪切波偏振方向也从NE向转为NW向,地震后剪切除波分裂时间延迟和偏振方向很快恢复,其时间

关 键 词:甘肃  S波分裂  异常特征  EDA模式  地震波
收稿时间:1997/8/18 0:00:00

THE CHARACTERISTICS OF SHEAR WAVE SPLITTING BEFORE AND AFTER THE YONGDENG MS5.8 EARTHQUAKE
ZHANG Fanmin,LI Qinghe and RONG Dailu.THE CHARACTERISTICS OF SHEAR WAVE SPLITTING BEFORE AND AFTER THE YONGDENG MS5.8 EARTHQUAKE[J].Northwestern Seismological Journal,1998,20(3):9-15.
Authors:ZHANG Fanmin  LI Qinghe and RONG Dailu
Institution:Lanzhou Institute of Seismology, CSB, Lanzhou 730000,Lanzhou Institute of Seismology, CSB, Lanzhou 730000 and Lanzhou Institute of Seismology, CSB, Lanzhou 730000
Abstract:The characteristics of shear wave splitting before and after the Yongdeng M S5.8 earthquake on July 22,1995 are studied by using the digital seismic records from 1990 to 1995 of Lanzhou station in CDSN network and the several records of Langsuo station which was established jointly by China and France.The time delays of splitting shear waves and the polarization directions of fast shear waves are determined quantitatively by using Maximum Eigenvalue (ME) method,Wave Distinguish Factor (WDF) method and Maximum Likelihood (ML) method.The results show that the time delay of splitting shear waves began to increase about one year before the earthquake,the polarization direction of fast shear waves turned from NE to NW before the event,and that the time delay of splitting shear waves and the polarization direction of fast shear waves became normal very fast after the earthquake.The variations in the time delay are similar to the results from Peacock (1988) and the variations in polarization direction of fast shear waves are similar to that before and after the Sunan earthquake (1990).
Keywords:Gansu  S wave fission  Anomalous character  Anisotropy  EDA model
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