| 稀疏台网的中小地震震源机制解反演研究——以2017年1月4日西藏仲巴4.7级地震为例 |
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| 引用本文： | 梁姗姗,徐志国,刘杰,黄志斌,邹立晔,陈楠.稀疏台网的中小地震震源机制解反演研究——以2017年1月4日西藏仲巴4.7级地震为例[J].中国地震,2019,35(1):53-64. |
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| 作者姓名： | 梁姗姗 徐志国 刘杰 黄志斌 邹立晔 陈楠 |
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| 作者单位： | 中国地震台网中心, 北京 100045,中国科学院大学计算地球动力学重点实验室, 北京 100049;国家海洋环境预报中心, 北京 100081,中国地震台网中心, 北京 100045,中国地震台网中心, 北京 100045,中国地震台网中心, 北京 100045,中国地震台网中心, 北京 100045 |
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| 基金项目： | 国家重点研发计划重点专项“海洋重大灾害预报技术研究与示范应用”（2016YFC1401506）资助 |
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| 摘 要： | 本文应用ISOLA近震全波形方法，以2017年1月4日西藏仲巴4.7级地震为例，反演稀疏台网记录的中小地震震源机制解。该地震反演所得最佳双偶机制参数为：节面Ⅰ的走向109°/倾角85°/滑动角-177°，节面Ⅱ的走向19°/倾角88°/滑动角-4°，最佳矩心位置为30.590°N、83.784°E，最佳质心深度为6km，矩震级MW4.6。震源机制反演结果表明此次地震是一次走滑型为主的事件，其与震源区域附近历史地震震源机制解具有相同性质。本文还应用CSPS初动扫描法，利用P波初动资料和近震波形联合约束反演此次地震的震源机制，并与ISOLA近震全波形反演结果进行比较，结果表明，联合少量台站的的三分量波形数据，能够定量地判断最佳震源机制解，降低了P波初动反演结果的非唯一性，同时也约束了由于少量台站参与全波形反演引起的解的不稳定性。本文研究为中小地震震源参数测定提供了一种简单有效的方法，具有较高的稳定性和可靠性。
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| 关 键 词： | 仲巴地震 震源机制解 全波形反演 P波初动 约束反演 |
| 收稿时间： | 2018/11/12 0:00:00 |
| 修稿时间： | 2019/1/22 0:00:00 |
Focal Mechanism Inversion of the Small and Moderate Earthquakes with the Data from a Sparse Network |
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| Liang Shanshan,Xu Zhiguo,Liu Jie,Huang Zhibin,Zou Liye and Chen Nan.Focal Mechanism Inversion of the Small and Moderate Earthquakes with the Data from a Sparse Network[J].Earthquake Research in China,2019,35(1):53-64. |
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| Authors: | Liang Shanshan Xu Zhiguo Liu Jie Huang Zhibin Zou Liye and Chen Nan |
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| Institution: | China Earthquake Networks Center, Beijing 100045, China,Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049, China;National Marine Environmental Forecasting Center, Beijing 100081, China,China Earthquake Networks Center, Beijing 100045, China,China Earthquake Networks Center, Beijing 100045, China,China Earthquake Networks Center, Beijing 100045, China and China Earthquake Networks Center, Beijing 100045, China |
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| Abstract: | We take an MS4.7 earthquake that occurred at Zhongba, Tibet on January 4, 2017 as an example. The focal mechanism solution is inverted with the broadband waveform from a sparse network of Tibetan Regional Digital Seismic Network using the ISOLA full-waveform method. The best double-couple solution of the earthquake for two nodal planes is:strike=109°/dip=85°/Rake=-177° for Noodle 1 and strike=19°/dip=88°/Rake=-4° for Noodle 2. The centroid location and depth is 30.590°N, 83.784°E/6km;the moment magnitude is MW=4.6, which shows a strike-slip faulting mechanism. The joint constraint inversion is conducted using the CSPS method with the P-wave polarity and local and near regional waveform data. The comparison of the results from two methods, including ISOLA and CSPS, shows that combining with the three-component waveform from a few stations can not only determine quantitatively the best solution but also avoid the non-uniqueness from the P-wave polarity inversion and constrain the instability due to the inversion with data from very few stations. A simple but effective way with high stability and reliability is provided in this paper to determine the focal mechanism solution of a small and moderate earthquake with the data from a sparse network. |
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| Keywords: | Zhongba earthquake Focal mechanism solution Full-waveform inversion P-wave polarity Constraint inversion |
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