IGGCAS OpenIR  > 地球与行星物理院重点实验室
Repeating microearthquakes and deep deformation along the major faults in the Sichuan-Yunnan region, China
Li Le1; Chen QiFu2,3; Niu FengLin4,5
2021-12-01
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
ISSN0001-5733
Volume64Issue:12Pages:4308-4326
AbstractRepeating microearthquakes (M<4) are recurrent ruptures at small fault patches, which provide in-situ information for studying the spatial variation and temporal evolution of subsurface deformation at seismogenic depth. In this study, we compiled a total of 76 repeating earthquake sequences occurring at major faults in the Sichuan-Yunnan region in southwest China. We then employed these sequences to estimate fault slip rates based on their sizes and recurrence intervals. The slip rates estimated at various parts of the study area are 4.3 similar to 5.4 mm . a(-1) at similar to 23 km deep along the Lijiang and Ninglang faults, 1.6 similar to 10.1 mm . a(-1) in the depth range of 3.0 similar to 12.3 km along the Xiaojiang fault, 2.3 similar to 10.0 mm . a(-1) at depths between 6.0 and 13.4 km along the northern segment of Honghe fault, 3.0 similar to 10.2 mm . a in the depth range of 3.0 similar to 18.7 km along the southern segment of Xianshuihe fault, 3.5 similar to 9.6 mm . a(-1) at depths between 4.0 and 17.3 km along the Longmenshan fault, and 5.8 similar to 10.2 mm . a(-1) in the depth range of 3.6 similar to 18.7 km at the southernmost Longmenshan fault. The observed slip rates among different faults are roughly in the similar range, which may reflect the characteristic of deformation within the Sichuan-Yunnan block and the Bayan Har block. Our results also showed that most of the repeating sequences tend to occur at the edge of asperities of strong earthquakes, suggesting a close spatial correlation between repeating microearthquakes and impending large devastating earthquakes. The slip rates estimated from deep sequences appears to systematically larger than those derived from shallow events. More importantly, there is a sudden acceleration in deep slip rate before strong earthquakes, which may suggest that the asperity is entering its meta-instable state.
KeywordSichuan-Yunnan region Repeating microearthquakes Recurrence intervals Deep slip rates Asperities
DOI10.6038/cjg202100516
WOS KeywordSPATIOTEMPORAL VARIATIONS ; EARTHQUAKE SEQUENCE ; WENCHUAN EARTHQUAKE ; EASTERN BOUNDARY ; SEISMIC EVENTS ; SLIP RATES ; ZONE ; RECURRENCE ; EVOLUTION ; INSTABILITY
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000751863800007
PublisherSCIENCE PRESS
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Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/104924
Collection地球与行星物理院重点实验室
Corresponding AuthorLi Le
Affiliation1.China Earthquake Adm, Inst Earthquake Forecasting, Beijing 100036, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China
4.China Univ Petr, State Key Lab Petr Resources & Prospecting, Unconvent Petr Res Inst, Beijing 102249, Peoples R China
5.Rice Univ, Dept Earth Environm & Planetary Sci, Houston, TX 77005 USA
Recommended Citation
GB/T 7714
Li Le,Chen QiFu,Niu FengLin. Repeating microearthquakes and deep deformation along the major faults in the Sichuan-Yunnan region, China[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2021,64(12):4308-4326.
APA Li Le,Chen QiFu,&Niu FengLin.(2021).Repeating microearthquakes and deep deformation along the major faults in the Sichuan-Yunnan region, China.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,64(12),4308-4326.
MLA Li Le,et al."Repeating microearthquakes and deep deformation along the major faults in the Sichuan-Yunnan region, China".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 64.12(2021):4308-4326.
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