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2019年12月26日湖北应城M4.9地震震源参数及余震活动性研究
盛敏汉1,2, 储日升1,2, 王清东1,2, 曾求1,2, 马海超1,2
1.中国科学院精密测量科学与技术创新研究院, 大地测量与地球动力学国家重点实验室, 武汉 430077;2.中国科学院大学, 北京 100049
摘要:
2019年12月26日湖北应城发生M4.9有感地震,其震感波及武汉大部分地区。为了分析该地震的发震构造及余震活动性,本文利用波形拟合方法测定了不同速度模型下该地震的震源机制解和矩心深度,并用Bootstrapping抽样反演技术评价反演结果;此外,利用模板匹配技术匹配主震和目录余震波形,获取了更为完整的余震目录。结果显示,应城地震以走滑为主,矩心深度7.5km左右,矩震级MW4.67;应城地震有1个前震和17个余震,余震序列缺少M2~4事件,表明应城地震为孤立型地震,M2以下地震的b值为0.8。
关键词:  应城地震  震源参数  抽样反演  孤立型地震
DOI:
分类号:P315
基金项目:国家重点研发计划(2018YFC504200)、国家自然科学基金(U20A2095、42004043、41704066)和中国科学院王宽诚率先人才计划“卢嘉锡国际合作团队项目”(GJTD-2018-12)共同资助
Study on Source Parameters and Aftershock Activity of the M4.9 Yingcheng Earthquake on December 26,2019 in Hubei Province
Sheng Minhan1,2, Chu Risheng1,2, Wang Qingdong1,2, Zeng Qiu1,2, Ma Haichao1,2
1.State Key Laboratory of Geodesy and Earth's Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China;2.University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:
The M4.9 Yingcheng earthquake on December 26,2019 in Hubei Province were felt by residents in most areas of Wuhan. In order to analyze the seismogenic structure and aftershock activity of this earthquake,the focal mechanisms and centroid depth of the earthquake are determined by waveform modelling with different velocity models. The inversion results are evaluated by bootstrapping sampling inversion technique. We use waveforms of the main shock and aftershocks to obtain a more complete aftershock catalog by template matching technique. The results show that the Yingcheng earthquake is dominant with strike slip movement,and the centroid depth is about 7.5km with the moment magnitude of MW4.67. There are one foreshock and 17 aftershocks detected,but the aftershock sequence is in lack of M 2~4 events,which indicates that the Yingcheng earthquake is an isolated earthquake. The b-value of the earthquake sequence below M 2 is 0.8.
Key words:  The Yicheng earthquake  Source parameters  Bootstrapping  Isolated earthquake