| 2017年6月16日湖北秭归Ms4.3地震成因初探 |
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| 引用本文： | 李伟,储日升,王烁帆.2017年6月16日湖北秭归Ms4.3地震成因初探[J].地震,2019,39(3):28-42. |
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| 作者姓名： | 李伟 储日升 王烁帆 |
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| 作者单位： | 中国科学技术大学地球和空间科学学院,安徽合肥,230026;中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室,湖北武汉,430077 |
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| 基金项目： | 国家自然科学基金(41661164035)资助 |
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| 摘 要： | 北京时间2017年6月16日19时48分, 湖北省秭归县发生MS4.3地震(震中位置31.06°N, 110.48°E)。 此次地震导致当地160多间建筑物出现不同程度损坏, 100多人生活受到影响, 震区中危岩体出现一定程度破坏。 分析此次地震的震源参数将有助于了解其震源特征和发震机制。 本文首先获取了震中距在3°以内的40个宽频带固定台站的三分量数据, 然后利用FK(Frequency wavenumber)方法计算了在不同深度下Crust2.0模型和改进的1-D模型的格林函数, 分别使用Cut And Paste(CAP)方法反演得到本次地震的震源机制解和深度; 并采用基阶Rayleigh波振幅谱进一步约束了质心深度。 结果表明此次地震的最佳震源机制解的节面Ⅰ: 68°/59°/163°; 节面Ⅱ: 166°/75°/32°, 最佳矩震级为MW4.3, 最佳深度约为5 km。 对比2013年巴东地震、 2014年秭归地震以及2011年湖北阳新—江西瑞昌地震的震源参数和余震信息, 此次地震有可能是水库诱发地震, 但要判断成因还需进一步研究。
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| 关 键 词： | 震源机制 CAP反演 水库地震 2017年秭归Ms4.3地震 |
| 收稿时间： | 2018-07-23 |
Preliminary Discussion on the Seismogenic Mechanism of MS4.3 Earthquake in June 2017 in Zigui County,Hubei Province |
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| LI Wei,CHU Ri-sheng,WANG Shuo-Fan.Preliminary Discussion on the Seismogenic Mechanism of MS4.3 Earthquake in June 2017 in Zigui County,Hubei Province[J].Earthquake,2019,39(3):28-42. |
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| Authors: | LI Wei CHU Ri-sheng WANG Shuo-Fan |
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| Institution: | 1.Department of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China;
2.State Key Laboratory of Geodesy and Earth′s Dynamics, Institute of Geodesy and Geophysics, CAS, Wuhan 430077, China |
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| Abstract: | Seismicity of the head portion of the three Gorges Reservoir region has increased obviously since the first impounding at the end of May, 2003. Most of the quakes are reservoir-induced, and mainly occurred on the Gaoqiao Fault west to the Zigui Basin, and the north end of the Xiannvshan Fault which locates between the Zigui Basin and Huangling Massif. The focal depths are usually less than 10 km, with the average of 4 km. Around UTC time 19:48 on June 16th, 2017, a MS4.3 earthquake occurred near Zigui county (31.06°N,110.48°E). This earthquake has damaged more than 160 houses, and caused some collapses of medium-risk rock. Analyzing source parameters of the M4.3 earthquake can help us learn its seismogenic mechanism and provide reference for reservoir induced earthquakes. In this study, we use a total of 40 three-component broadband seismic stations within an epicenter distance of less than 3°. Two velocity models, Crust 2.0, a modified 1-D equivalent model, and the frequency-wavenumber (FK) method have been adopted to calculate Green's Functions at different depths. We use the CAP algorithm to invert focal mechanism of the MS4.3 earthquake for each model. We also use the fundamental-mode Rayleigh wave amplitude spectra to determine the centroid depth. The results show that the focal mechanism has the best solution of plane I: 68°/59°/163° and plane II: 166°/75°/32°. The moment magnitude is MW4.3 and the centroid depth is around 5 km. By comparing the results with those for the 2013 Badong earthquake, the 2014 Zigui earthquake and the 2011 Yangxin—Ruichang earthquake, we infer that the MS4.3 earthquake might be a reservoir induced earthquake, but further study is still needed to determine the detailed seismogenic mechanism. |
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| Keywords: | Focal Mechanism CAP inversion Rayleigh Wave Amplitude Spectra Reservoir induced earthquake |
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