| 2016年新疆呼图壁6.2级地震前b值异常特征研究 |
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| 引用本文： | 刘子璇,冯建刚,王维桐.2016年新疆呼图壁6.2级地震前b值异常特征研究[J].西北地震学报,2020,42(1):150-156. |
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| 作者姓名： | 刘子璇 冯建刚 王维桐 |
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| 作者单位： | 中国地震局兰州地震研究所, 甘肃 兰州 730000,中国地震局兰州地震研究所, 甘肃 兰州 730000;甘肃兰州地球物理野外科学观测研究站, 甘肃 兰州 730000,中国地震局兰州地震研究所, 甘肃 兰州 730000 |
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| 基金项目： | 中国地震局地震预测研究所基本科研业务费专项（2017IESLZ07）；甘肃省科技支撑计划（1504FKCA065） |
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| 摘 要： | 利用2009年以来中国地震台网中心地震编目资料,以2016年新疆呼图壁6.2级地震作为研究对象,采用最大似然法进行b值空间扫描计算,获取震前震中及其邻区地震b值的空间图像。研究结果显示,2016年呼图壁6.2级地震发生在震前显著低b值区域,该异常特征可能反映了地震孕育的应力积累过程,印证了b值的物理意义。
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| 关 键 词： | 呼图壁地震 B值 最大似然法 地震危险性分析 |
| 收稿时间： | 2019/8/9 0:00:00 |
Anomalies of b-value Changes prior to theHutubi MS6.2 Earthquake in 2016 |
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| LIU Zixuan,FENG Jiangang and WANG Weitong.Anomalies of b-value Changes prior to theHutubi MS6.2 Earthquake in 2016[J].Northwestern Seismological Journal,2020,42(1):150-156. |
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| Authors: | LIU Zixuan FENG Jiangang and WANG Weitong |
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| Institution: | Lanzhou Institute of Seismology, CEA, Lanzhou 73000, Gansu, China,Lanzhou Institute of Seismology, CEA, Lanzhou 73000, Gansu, China;Lanzhou National Observatory of Geophysics, Lanzhou 73000, Gansu, China and Lanzhou Institute of Seismology, CEA, Lanzhou 73000, Gansu, China |
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| Abstract: | Based on the Gutenberg-Richer relation between earthquake magnitude and frequency, along with seismic data from the China Earthquake Networks Center since 2009, in this study, we analyzed the abnormal distribution of b-values prior to the Hutubi MS6.2 earthquake in 2016. We used the maximum likelihood method to calculate the b-values for the epicentral and surrounding region prior to the Hutubi earthquake and obtained spatial images of the b-value in the study area. The results showed that there is a large area of low b-value anomalies prior to the Hutubi MS6.2 earthquake, with the b-values ranging between 0.6-2.2, which indicates that this region is accumulating a high degree of horizontal stress. This anomaly may reflect the stress accumulation process in advance of an earthquake and prove the physical significance of the b-value. |
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| Keywords: | Hutubi earthquake b-value maximum likelihood method seismic hazard analysis |
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