IGGCAS OpenIR  > 岩石圈演化国家重点实验室
Focal mechanism solutions of the 2014 Ludian M(s)6.5 earthquake sequence derived from multiple-bandwidth waveform fitting
Chen JunLei1,2,3; Zheng Yong4; Zhang Lu1,2; Wu ZhenBo5; Hou Jue1,2,6; Guo GuiHong7; Liu YouShan1; Xu Tao1,8; Bat ZhiMing1
2020-04-01
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
Volume63Issue:4Pages:1472-1483
AbstractThe 2014 Ludian M(s)6.5 earthquake caused dramatic death and significant economic losses, and received much attention. Many studies have been made on the focal mechanisms of this earthquake sequence. However, due to the limitation of the inversion method and the complex structures of the seismic area, there are still some disputes on this issue, especially concerned with the dip-angle causative fault of the mainshock. In this work, we use regional seismic waveform inversion based on the gCAP method and the full waveform modeling to invert focal mechanism solutions of the mainshock and 9 aftershocks of the Ludian earthquake sequence. Results show that the azimuthal coverage has a significant effect on the reliability and stability of gCAP's inversion. To solve this problem, a two-bandwidth method is proposed in this paper, in which the bandwidths are 0. 01 similar to 0. 05 Hz and 0. 01 similar to 0. 2 Hz, respectively. With this inversion, this work determines that the dip angle and rake of the mainshock 76 degrees similar to 83 degrees and 157 degrees similar to 164 degrees, respectively, implying a high-dip strike-slip rupture. The stabilities of the gCAP method and the full waveform modeling are verified by the good consistence between the derived mechanisms of the aftershocks. Our research suggests that the high-dip character of the Ludian earthquake might lead to the fast and complete energy release, which may be the main reason for the aggravating destruction and the lack of larger aftershocks.
KeywordLudian earthquake Regional waveform inversion Focal mechanisms high-dip event
DOI10.6038/cjg2020N0386
WOS KeywordJIUZHAIGOU EARTHQUAKE ; RUPTURE PROCESS ; SEISMOGENIC ENVIRONMENT ; SOURCE PARAMETERS ; CRUSTAL VELOCITY ; SOURCE INVERSION ; MOMENT TENSORS ; POINT-SOURCE ; YUNNAN ; CHINA
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000524071300018
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95550
Collection岩石圈演化国家重点实验室
Corresponding AuthorChen JunLei
Affiliation1.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Yunnan Earthquake Agcy, Kunming 650224, Yunnan, Peoples R China
4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Inst Geophys & Geomat, Wuhan 430074, Peoples R China
5.Chengdu Univ Technol, Coll Geophys, Chengdu 610059, Peoples R China
6.China Earthquake Adm, Inst Geophys, Beijing 100081, Peoples R China
7.Lanzhou Univ, Key Lab Mech Disaster & Environm Western China, Lanzhou 730000, Peoples R China
8.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Chen JunLei,Zheng Yong,Zhang Lu,et al. Focal mechanism solutions of the 2014 Ludian M(s)6.5 earthquake sequence derived from multiple-bandwidth waveform fitting[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2020,63(4):1472-1483.
APA Chen JunLei.,Zheng Yong.,Zhang Lu.,Wu ZhenBo.,Hou Jue.,...&Bat ZhiMing.(2020).Focal mechanism solutions of the 2014 Ludian M(s)6.5 earthquake sequence derived from multiple-bandwidth waveform fitting.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(4),1472-1483.
MLA Chen JunLei,et al."Focal mechanism solutions of the 2014 Ludian M(s)6.5 earthquake sequence derived from multiple-bandwidth waveform fitting".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.4(2020):1472-1483.
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