| DOI: | 10.1038/ngeo2335
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| 论文题名: | Complexity of the deep San Andreas Fault zone defined by cascading tremor |
| 作者: | Shelly D.R.
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| 刊名: | Nature Geoscience
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| ISSN: | 17520894
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| 出版年: | 2015
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| 卷: | 8, 期:2 | | 起始页码: | 145
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| 结束页码: | 151
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| 语种: | 英语
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| Scopus关键词: | fault slip
; fault zone
; microplate
; plate boundary
; rupture
; seismic wave
; wave propagation
; California
; San Andreas
; United States
|
| 英文摘要: | Weak seismic vibrations - tectonic tremor - can be used to delineate some plate boundary faults. Tremor on the deep San Andreas Fault, located at the boundary between the Pacific and North American plates, is thought to be a passive indicator of slow fault slip. San Andreas Fault tremor migrates at up to 30 m s -1, but the processes regulating tremor migration are unclear. Here I use a 12-year catalogue of more than 850,000 low-frequency earthquakes to systematically analyse the high-speed migration of tremor along the San Andreas Fault. I find that tremor migrates most effectively through regions of greatest tremor production and does not propagate through regions with gaps in tremor production. I interpret the rapid tremor migration as a self-regulating cascade of seismic ruptures along the fault, which implies that tremor may be an active, rather than passive participant in the slip propagation. I also identify an isolated group of tremor sources that are offset eastwards beneath the San Andreas Fault, possibly indicative of the interface between the Monterey Microplate, a hypothesized remnant of the subducted Farallon Plate, and the North American Plate. These observations illustrate a possible link between the central San Andreas Fault and tremor-producing subduction zones. © 2015 Macmillan Publishers Limited. All rights reserved |
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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/106257
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| Appears in Collections: | 气候减缓与适应
科学计划与规划
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作者单位: | US Geological Survey, 345 Middlefield Road MS910, Menlo Park, CA, United States
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| Recommended Citation: | |
Shelly D.R.. Complexity of the deep San Andreas Fault zone defined by cascading tremor[J]. Nature Geoscience,2015-01-01,8(2)
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