| 采用体波谱振幅相关系数方法研究地震集中区震源机制变化过程 |
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| 引用本文： | 李霞,董翔,刘希强,苗庆杰.采用体波谱振幅相关系数方法研究地震集中区震源机制变化过程[J].西北地震学报,2010,32(3):231-236. |
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| 作者姓名： | 李霞 董翔 刘希强 苗庆杰 |
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| 作者单位： | 山东省地震局; |
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| 基金项目： | 山东省地震局2008年数字地震波研究基金 |
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| 摘 要： | 同一震源区两次地震到达某台站的直达P波、S波零频观测谱值之比与其辐射图型因子之比线性相关,而后者取决于震源机制的几何特性。用波形记录计算谱振幅相关系数,认为该系数是震源机制异同的归一化数值描述。据此对2003年青岛序列及冀鲁豫交界地区小震集中区地震事件进行聚类分组,给出序列事件的滑动平均相关系数的时序曲线。研究结果表明:青岛序列的滑动平均相关系数时序曲线存在由一致到发散的变化过程,即震源区应力场强度由相对集中向逐步分散过度;冀鲁豫交界地区小震集中区谱振幅相关系数较低,震源机制各不相同,区域应力积累没有形成任何一个优势方向。
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| 关 键 词： | 震源机制 地震序列 小震集中区 体波谱振幅 相关系数 |
Study on the Focal Mechanism Changing Process in Earthquake Concentrating Area Using Correlation Coefficient of Body-wave Spectral Amplitudes |
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| LI?Xi,DONG?Xiang,LIU?Xi-qiang and MIAO?Qing-jie.Study on the Focal Mechanism Changing Process in Earthquake Concentrating Area Using Correlation Coefficient of Body-wave Spectral Amplitudes[J].Northwestern Seismological Journal,2010,32(3):231-236. |
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| Authors: | LI?Xi DONG?Xiang LIU?Xi-qiang and MIAO?Qing-jie |
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| Institution: | LI Xia,DONG Xiang,LIU Xi-qiang,MIAO Qing-jie(Earthquake Administration of Shandong Province,Jinan 250014,China) |
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| Abstract: | The ratio of observed spectral amplitudes of direct P and S wave phases is linearly correlated with the ratio of their radiation pattern factors,and the radiation pattern factor depend on geometrical property of focal mechanism,if 2 events occurred in same focal region and recorded by same seismic station.Using low-frequency spectral amplitude values the correlation coefficient can be calculated,and the coefficent gives a normalized measurement for the similarity of focal mechanisms.Applying this method to ... |
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| Keywords: | Focal mechanism Earthquake sequence Small earthquake concentrating area Body-wave spectral amplitude Correlation coefficient |
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