| 利用区域宽频地震数据反演2021年5月云南漾濞MS6.4地震震源破裂过程 |
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| 引用本文： | 朱音杰,罗艳,赵里,田建慧.利用区域宽频地震数据反演2021年5月云南漾濞MS6.4地震震源破裂过程[J].地球物理学报,2022(3). |
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| 作者姓名： | 朱音杰 罗艳 赵里 田建慧 |
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| 作者单位： | 河北红山巨厚沉积与地震灾害国家野外科学观测研究站;中国地震局地震预测研究所;北京大学地球与空间科学学院;河北省地震局 |
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| 基金项目： | 国家自然科学基金面上项目(41974063);地震科学联合基金(U1939202)资助。 |
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| 摘 要： | 本文基于有限断层模型反演方法,利用区域宽频带数据反演了2021年5月云南漾濞MS6.4地震的震源破裂过程,结果显示:此次地震的发震断层走向为SE向,主要以右旋走滑为主.破裂主要发生在震源东南侧,最大错动量约为0.55 m,位于深度约9 km处,发生明显破裂的深度约达13 km.此次地震释放的标量地震矩为1.48×1018N·m,相当于矩震级MW6.05.地震能量主要在前11 s释放.在深度为6~8 km处破裂速度有明显的变快,可能加剧了地表的震动.
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| 关 键 词： | 漾濞地震 有限断层 滑动分布 震源破裂过程 |
Rupture process of Yunnan Yangbi MS6.4 earthquake constrained by regional broadband seismograms |
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| ZHU YinJie,LUO Yan,ZHAO Li,TIAN JianHui.Rupture process of Yunnan Yangbi MS6.4 earthquake constrained by regional broadband seismograms[J].Chinese Journal of Geophysics,2022(3). |
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| Authors: | ZHU YinJie LUO Yan ZHAO Li TIAN JianHui |
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| Institution: | (Hebei Hongshan National Observatory on Thick Sediments and Seismic Hazards,Hebei Xingtai 054000,China;Key Laboratory of Earthquake Prediction,Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China;School of Earth and Space Sciences,Peking University,Beijing 100871,China;Hebei Earthquake Agency,Shijiazhuang 050021,China) |
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| Abstract: | Based on the finite fault inversion method,we investigated the rupture process of the May 2021 Yunnan Yangbi MS6.4 earthquake by regional broadband waveform records.The results indicate that the Yangbi earthquake occurred on a SE-striking right-lateral strike-slip fault.Most of rupture is concentrated in a region to the southeast of the hypocenter,with a maximum slip of 0.55 m located at a depth of about 9 km.The obvious rupture reaches to a depth of about 13 km.The total seismic moment released by the whole fault is 1.48×1018N·m,equivalent to MW6.05.The seismic energy is mainly released in the first 11 s.The rupture velocity becomes significantly faster at a depth of 6~8 km,which may aggravate the surface vibration. |
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| Keywords: | Yangbi earthquake Finite fault Slip distribution Source rupture process |
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