globalchange  > 气候减缓与适应
DOI: 10.1002/grl.50354
论文题名:
Evidence for fluid-triggered slip in the 2009 Mount Rainier, Washington earthquake swarm
作者: Shelly D.R.; Moran S.C.; Thelen W.A.
刊名: Geophysical Research Letters
ISSN: 0094-9152
EISSN: 1944-8883
出版年: 2013
卷: 40, 期:8
起始页码: 1506
结束页码: 1512
语种: 英语
英文关键词: earthquake swarms ; fluids ; Mount Rainier ; precise earthquake location
Scopus关键词: Earthquake location ; Earthquake swarms ; High-pressure fluids ; Mount Rainier ; Preexisting fracture ; Shallow earthquakes ; Strike-slip motion ; Vertical structures ; Buildings ; Diffusion in liquids ; Fluids ; Fracture ; Strike-slip faults ; Earthquakes ; data acquisition ; earthquake event ; earthquake swarm ; fault zone ; seismic survey ; slip ; stress field ; strike (geology) ; waveform analysis ; weather station ; Cascade Range ; Mount Rainier ; United States ; Washington [United States]
英文摘要: A vigorous swarm of over 1000 small, shallow earthquakes occurred 20-22 September 2009 beneath Mount Rainier, Washington, including the largest number of events ever recorded in a single day at Rainier since seismic stations were installed on the edifice in 1989. Many events were only clearly recorded on one or two stations on the edifice, or they overlapped in time with other events, and thus only ~200 were locatable by manual phase picking. To partially overcome this limitation, we applied waveform-based event detection integrated with precise double-difference relative relocation. With this procedure, detection and location goals are accomplished in tandem, using cross-correlation with continuous seismic data and waveform templates constructed from cataloged events. As a result, we obtained precise locations for 726 events, an improvement of almost a factor of 4. These event locations define a ~850 m long nearly vertical structure striking NNE, with episodic migration outward from the initial hypocenters. The activity front propagates in a manner consistent with a diffusional process. Double-couple-constrained focal mechanisms suggest dominantly near-vertical strike-slip motion on either NNW or ENE striking faults, more than 30° different than the strike of the event locations. This suggests the possibility of en echelon faulting, perhaps with a component of fault opening in a fracture-mesh-type geometry. We hypothesize that the swarm was initiated by a sudden release of high-pressure fluid into preexisting fractures, with subsequent activity triggered by diffusing fluid pressure in combination with stress transfer from the preceding events. Key Points New methods allow high-resolution tracking of earthquake swarms The results suggest the swarm was triggered by diffusing high-pressure fluids Earthquake locations and focal mechanisms suggest fault mesh failure. ©2013. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84877966132&doi=10.1002%2fgrl.50354&partnerID=40&md5=6bff2be394760b8fb6ff708aac67dbc1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6416
Appears in Collections:气候减缓与适应

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作者单位: U.S. Geological Survey, Volcano Science Center, Menlo Park, CA 94025, United States

Recommended Citation:
Shelly D.R.,Moran S.C.,Thelen W.A.. Evidence for fluid-triggered slip in the 2009 Mount Rainier, Washington earthquake swarm[J]. Geophysical Research Letters,2013-01-01,40(8).
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