globalchange  > 气候变化与战略
DOI: 10.1038/s41561-021-00740-1
论文题名:
Correlation of porosity variations and rheological transitions on the southern Cascadia megathrust
作者: Guo H.; McGuire J.J.; Zhang H.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2021
卷: 14, 期:5
起始页码: 341
结束页码: 348
语种: 英语
英文关键词: autocorrelation ; correlation ; earthquake rupture ; rheology ; S-wave ; seismic hazard ; subduction zone ; transition zone ; Pacific Northwest ; Cascadia
英文摘要: The unknown onshore extent of megathrust earthquake rupture in the Cascadia subduction zone represents a key uncertainty in earthquake hazard for the Pacific Northwest that is governed by the physical state and mechanical properties of the plate interface. The Cascadia plate interface is segmented into an interseismically locked zone located primarily offshore that is expected to rupture in large earthquakes, a region of aseismic slow slip at greater depth, and an intervening transition zone of uncertain rupture potential. Here we image the evolution of the ratio of seismic compressional to shear wave velocities from the locked zone to the transition zone, which is related to changes in fluid content of the plate boundary zone, using a dense onshore–offshore seismic dataset from southernmost Cascadia. The locked zone shows evidence of high fluid content implying a high porosity, yet the downdip transition zone shows an order of magnitude lower porosity. This strong variation is consistent with models that contain a ductile region between the earthquake rupture and slow slip zones that would inhibit onshore propagation of future large earthquake ruptures and hence reduce seismic hazard. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169758
Appears in Collections:气候变化与战略

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作者单位: Laboratory of Seismology and Physics of Earth’s Interior, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China; Department of Geoscience, University of Wisconsin-Madison, Madison, WI, United States; US Geological Survey, Moffett Field, CA, United States; CAS Center for Excellence in Deep Earth Science, Guangzhou, China; Mengcheng National Geophysical Observatory, University of Science and Technology of China, Hefei, China

Recommended Citation:
Guo H.,McGuire J.J.,Zhang H.. Correlation of porosity variations and rheological transitions on the southern Cascadia megathrust[J]. Nature Geoscience,2021-01-01,14(5)
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