globalchange  > 气候变化与战略
DOI: 10.1016/j.epsl.2020.116582
论文题名:
Spatio-temporal foreshock evolution of the 2019 M 6.4 and M 7.1 Ridgecrest, California earthquakes
作者: Huang H.; Meng L.; Bürgmann R.; Wang W.; Wang K.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 551
语种: 英语
中文关键词: 2019 Ridgecrest earthquake sequence ; b-value analysis ; foreshock detection and relocation ; spatio-temporal foreshock evolution
英文关键词: Critical current density (superconductivity) ; Faulting ; Matched filters ; Earthquake catalogs ; Earthquake sequences ; Filter detections ; Foreshock sequences ; Nucleation zone ; Repeating earthquake ; Short durations ; Spatio temporal ; Earthquakes ; coseismic process ; detection method ; earthquake event ; earthquake rupture ; fault zone ; foreshock ; relocation ; spatiotemporal analysis ; California ; United States
英文摘要: The 2019 M 6.4 and M 7.1 Ridgecrest, California earthquake sequence provides an ideal opportunity to study the seismicity evolution and interaction among multiple complex fault structures. Here, we apply the matched-filter detection method to obtain a relatively complete (magnitude of completeness ≈ 0.9) and precisely relocated earthquake catalog. The results show a short-duration (∼ 31 minutes) foreshock sequence with 28 events, before the M 6.4 earthquake. The foreshock sequence started with a M 4.0 event and was aligned along the NW-SE direction. This implies that the M 6.4 rupture initiated on a NW trending fault segment, before rupturing the primary SW trending fault. Repeating earthquakes before and after the M 7.1 event are separated in space and bound the areas of large coseismic slip in the M 6.4 and M 7.1 events. This might reflect local slow slip acceleration near the edges of coseismic rupture asperities. The NW-striking fault zones illuminated by seismicity are separated into several sub-regions with distinct pre-M7.1 seismicity rate evolutions. The M 7.1 event nucleated in a region of local seismicity concentration which intensified ∼ 3 hr before the M 7.1 mainshock. The M 7.1 nucleation zone is characterized by a significantly low b value of events that occurred since the M 6.4 event, which might indicate local failure conditions approaching a critical state. © 2020 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165037
Appears in Collections:气候变化与战略

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作者单位: Earth Planetary and Space Sciences, University of California, Los Angeles, CA 90025, United States; Berkeley Seismological Laboratory, Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, United States; Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089, United States

Recommended Citation:
Huang H.,Meng L.,Bürgmann R.,et al. Spatio-temporal foreshock evolution of the 2019 M 6.4 and M 7.1 Ridgecrest, California earthquakes[J]. Earth and Planetary Science Letters,2020-01-01,551
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