| 汶川地震序列b值的分析研究 |
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| 引用本文： | 王俊,阮祥,郑江蓉,孙业君,江昊琳,詹小艳.汶川地震序列b值的分析研究[J].地震地磁观测与研究,2009,30(2):15-21. |
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| 作者姓名： | 王俊 阮祥 郑江蓉 孙业君 江昊琳 詹小艳 |
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| 作者单位： | 1. 中国南京,210014,江苏省地震局
2. 中国成都,610041,四川省地震局 |
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| 基金项目： | 中国地震局科技支撑计划 |
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| 摘 要： | 采用Aki等（1965）和Shi等（1982）计算b值及标准差的方法，分析了2008年5月12日～2008年8月31日四川地震台网所记录到的汶川地震序列ML≥2．0地震的b值，在空间、时间以及随震源深度的变化特征。结果显示：汶川地震序列b值在震源区上分布是非均匀的，但基本在0．5，0．9]之间变化，震源区的中段b值高于两端；同时发现，几次M≥6．0余震都发生在b值较低的区域内；震源区b值具有随震源深度增加而减小的趋势，在20km左右处，减小的趋势最为明显；随着时间的推移，b值波动变化幅度逐渐减小，周期变大。
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| 关 键 词： | 汶川地震序列 b值 震源区 震源深度 |
Study on the variation of b value in Wenchuan earthquake series |
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| Wang Jun,Ruan Xiang,Zhen Jiangrong,Sun Yejun,Jiang Haolin,Zhan Xiaoyan.Study on the variation of b value in Wenchuan earthquake series[J].Seismological and Geomagnetic Observation and Research,2009,30(2):15-21. |
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| Authors: | Wang Jun Ruan Xiang Zhen Jiangrong Sun Yejun Jiang Haolin Zhan Xiaoyan |
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| Institution: | Wang Jun , Ruan Xiang , Zhen Jiangrong , Sun Yejun , Jiang Haolin , Zhan Xiaoyan(1.Earthquake Administration of J iangsu Province, Nanjing 210014, China;2. Earthquake Administration of Sichuan Province, Chengdu 610041, China) |
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| Abstract: | In this paper, using the method presented by Aki（1965）, Shi and Bolt （1982）, the b value in Wenehuan earthquake series （ML≥2.0） recorded by Sichuan seismic network at the time between 2008-05-12 and 2008-08-31 is analyzed. The results show that the variation of b val- ue in the earthquake source region is non-uniform. The b value is in the range form 0. 5 to 0.9, and the b value of middle segment of the earthquake source region is high than that of other regions. At the same time, we found that almost all strong aftershoeks （M≥6.0） occurred in the low b value region. In addition, the results show that the b value deceases with earthquake depth increasing. The variation features is most significant at 20 km depth. The variation of b value of Wenchuan earthquake series with time was also discussed. The variation of amplitude is deceasing with time and the variation of period is on the contrary. |
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| Keywords: | Wenchuan earthquake series b value earthquake source region earthquake depth |
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