| 景谷M_S 6.6地震前地震矩加速释放时空扫描特征研究 |
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| 引用本文： | 何应文,王建芳,杨晓琳,杨建文.景谷M_S 6.6地震前地震矩加速释放时空扫描特征研究[J].华南地震,2019,39(1):20-24. |
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| 作者姓名： | 何应文 王建芳 杨晓琳 杨建文 |
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| 作者单位： | 云南省地震局云县地震台,云南 云县,675803;云南省临沧市地震局,云南 临沧,677000;临沧市临翔区地震局,云南 临沧,677000;云南省地震局形变测量中心,昆明,650041 |
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| 基金项目： | 中国地震局地震监测、预测、科研三结合课题;云南省地震局青年地震科学基金 |
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| 摘 要： | 为考察2014年10月7日景谷M_S 6.6地震前的可能的中长期地震前兆现象以及相关的孕震物理过程,采用加速矩释放(AMR)现象对此次地震进行了分析,首先用T=15 a, R=100 km的时空窗对CBS释放曲线的均方根残差RMS在m-tf二维空间中的分布以及最小RMS对应的m值随时间的变化分析,然后用震前15个月地震资料以逐3个月的扫描方式,对T-M_C二维空间中矩释放指数m值的分布进行分析。结果表明:景谷M_S 6.6地震前在震中附近100 km范围内, m值随着时间逐渐逼近实际发震时刻而逐渐减小,时间上有逐渐趋近于临界状态的趋势,空间上震前似存在AMR逐渐向震中附近"迁移"的现象。
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| 关 键 词： | 景谷地震 加速矩释放(AMR)现象 矩释放指数m值 时空扫描 迁移 |
Study on Spatio-temporal Scanning Characteristics of Accelerating Moment Release Before Jinggu M_s 6.6 Earthquake |
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| HE Yingwen,WANG Jianfang,YANGXiaolin,YANG Jianwen.Study on Spatio-temporal Scanning Characteristics of Accelerating Moment Release Before Jinggu M_s 6.6 Earthquake[J].South China Journal of Seismology,2019,39(1):20-24. |
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| Authors: | HE Yingwen WANG Jianfang YANGXiaolin YANG Jianwen |
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| Institution: | (Yunxian Seismic Station,Yunxian 675803,China;Lincang City Seismological Bureau of Yunnan province,Lincang 665000,China;Linxiang District Seismological Bureau of Yunnan province,Lincang 665000,China;Yunnan Earthquake Agency,Kunming 650041,China) |
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| Abstract: | The paper analyzes the accelerating moment release(AMR)phenomenon before the Jinggu Ms 6.6 earthquake on October 7th,2014. First,the paper analyzes the distribution of the root mean square residual RMS of the CBS release curve in the two-dimensional m-tf space by using the time window of T=15 a and R=100 km,and the change of m value corresponding to the minimum RMS over time is also analyzed. Then,the paper analyzes the distribution of the m-value of the moment release index in the T-MC two-dimensional space by using the 15 months seismic data scanning every three months. The results show that in the range of 100 km near the epicenter before Jinggu Ms 6.6 earthquake,the m value gradually decreases as the time approximated to the actual shock time;there is a tendency to gradually approach the critical state in time,and there seems to be the phenomenon of “migration”of AMR to the epicenter before the earthquake. |
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| Keywords: | Jinggu earthquake Seismic accelerating moment release The value of M Space-time scanning Migrate |
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