| DOI: | 10.1002/2014GL062079
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| 论文题名: | Stress drops of repeating earthquakes on the San Andreas Fault at Parkfield |
| 作者: | Abercrombie R.E.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9456
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| EISSN: | 1944-9187
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| 出版年: | 2014
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| 卷: | 41, 期:24 | | 起始页码: | 8784
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| 结束页码: | 8791
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| 语种: | 英语
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| 英文关键词: | earthquake
; Parkfield
; San Andreas Fault
; stress drop
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| Scopus关键词: | Drops
; Faulting
; Strike-slip faults
; Empirical green's functions
; Frequency band width
; Highly-correlated
; Parkfield
; Repeating earthquake
; San Andreas fault
; Stress drop
; Temporal variation
; Earthquakes
; correlation
; earthquake event
; earthquake magnitude
; observatory
; San Andreas Fault
; stress change
; temporal variation
; California
; Parkfield
; United States
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| 英文摘要: | I calculate well-resolved corner frequencies and stress drops for 25 earthquakes (1989-2006) in the three repeating sequences targeted by the San Andreas Fault Observatory at Depth, using borehole data and multiple, highly correlated empirical Green's functions (EGFs). The earthquakes in the largest magnitude (M ~ 2.1) cluster exhibit source spectra well-fit by a circular source model. The corner frequencies correlate with those from the regional study by Allmann and Shearer (), suggesting that the interevent variability is resolvable. The earthquakes have stress drops between 25 and 65 MPa, with a gradual increase before the 2004 M6 earthquake, followed by an immediate decrease, then a rapid return to previous levels. The spectra of the cluster of M ~ 1.9 earthquakes include high-frequency energy not fit by simple source models and so stress drops are unreliable, and probably underestimated (1-20 MPa). There is no correlation with previous studies, and interevent variation is not resolvable. The earthquakes in the smallest magnitude cluster (M ~ 1.8) have the highest corner frequencies, but similar stress drops (4-120 MPa). The stress drops exhibit the same temporal variation as the first cluster, but there is poor correlation with Allmann and Shearer (), probably because their frequency bandwidth is too limited. Key Points Stress drop decreases following 2004 M6 earthquake but quickly reboundsIndependent studies agree for well-recorded simple eventsMore complex sources exhibit larger scatter both within and between studies ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84921881918&doi=10.1002%2f2014GL062079&partnerID=40&md5=9a678d6e960473d39290a33e799445f8
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6720
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Earth and Environment, Boston University, Boston, MA, United States
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| Recommended Citation: | |
Abercrombie R.E.. Stress drops of repeating earthquakes on the San Andreas Fault at Parkfield[J]. Geophysical Research Letters,2014-01-01,41(24).
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