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The seismicity in the southern Longmenshan fault zone based on a dense seismic array
Huang YanLing1; Liang ChunTao1,2; Wu Jin3; Wang ChaoLiang1; Liu ZhiQiang1; Jiang NingBo1
2020-03-01
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
Volume63Issue:3Pages:1183-1196
AbstractA dense seismic array deployed around the seismic gap between the Wenchuan and Lushan earthquakes provided a continuous recording from December 2016 to April 2018. An earthquake catalogue consisting of 2227 earthquakes with complete magnitude of M-c = 0 was obtained after manually picking P and S first arrivals, locating and calculating local magnitudes. The complete catalogue carried abundant information about the spatiotemporal distribution of seismicity and earthquake hazard risk. Relocated using hypoDD, focal depths of all earthquakes range from 5 to 20 km, which is consistent with the seismogenic depth of Longmenshan fault zone. Most of events occurred in the source region of the Wenchuan and Lushan earthquakes, and the characteristics of depth expansion is similar to that of early aftershocks. At the same time, the eastward movement of the Tibetan plateau is blocked by Baoxing and Pengguan complexes, forming frequent seismic activities in the northwest side of two complexes. Relocation results clearly delineated a similar to 30 km long and similar to 20 km wide seismicity-silent zone on Wenchuan-Maoxian and Yingxiu-Beichuan fault. The seismicity deficit zone is coupled with the low-velocity zone related to partial melting. This phenomenon indicates that the heating effect of the partial melting in the lower crust is a main reason for the abnormally low seismicity. Anticorrelation between seismicity and monthly precipitation variation rate is also observed during the monitoring period, which means earthquake rates is modulated modestly by the seasonal precipitation in the study region. A comprehensive analysis with the 3D velocity model, historical strong earthquakes and b-value suggests the possibility of future earthquake risk along the middle part of Pengguan fault and neighboring blind faults to the east of seismic gap.
KeywordSeismicity Seismic gap Double difference location Spatiotemporal distribution Seismic risk
DOI10.6038/cjg2020N0227
WOS KeywordDOUBLE-DIFFERENCE RELOCATION ; 7.9 WENCHUAN EARTHQUAKE ; 2013 LUSHAN EARTHQUAKE ; FOCAL MECHANISM ; SICHUAN ; AFTERSHOCKS ; INVERSION ; GEOMETRY ; SEGMENT ; CHINA
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000519847700030
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/95533
Collection其他部门
Corresponding AuthorLiang ChunTao
Affiliation1.Chengdu Univ Technol, Minist Educ, Key Lab Earth Explorat & Informat Technol, Chengdu 610059, Peoples R China
2.Chengdu Univ Technol, State Key Lab Geohazard Prevent & Geoenvironm Pro, Chengdu 610059, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Huang YanLing,Liang ChunTao,Wu Jin,et al. The seismicity in the southern Longmenshan fault zone based on a dense seismic array[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2020,63(3):1183-1196.
APA Huang YanLing,Liang ChunTao,Wu Jin,Wang ChaoLiang,Liu ZhiQiang,&Jiang NingBo.(2020).The seismicity in the southern Longmenshan fault zone based on a dense seismic array.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,63(3),1183-1196.
MLA Huang YanLing,et al."The seismicity in the southern Longmenshan fault zone based on a dense seismic array".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 63.3(2020):1183-1196.
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