| DOI: | 10.1002/grl.50509
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| 论文题名: | Geometrical effects of a subducted seamount on stopping megathrust ruptures |
| 作者: | Yang H.; Liu Y.; Lin J.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8988
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| EISSN: | 1944-8719
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| 出版年: | 2013
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| 卷: | 40, 期:10 | | 起始页码: | 2011
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| 结束页码: | 2016
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| 语种: | 英语
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| 英文关键词: | barrier
; dynamic rupture
; seamount geometry
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| Scopus关键词: | barrier
; Barrier effects
; Dynamic ruptures
; Earthquake nucleation
; Earthquake rupture
; Effective normal stress
; Geometrical effect
; Realistic geometry
; Earthquakes
; Faulting
; Geometry
; Nucleation
; Transport properties
; Submarine geology
; earthquake damage
; geometry
; nucleation
; numerical model
; seamount
; thrust fault
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| 英文摘要: | We have numerically simulated dynamic ruptures along a "slip- weakening" megathrust fault with a subducted seamount of realistic geometry, demonstrating that seamounts can act as a barrier to earthquake ruptures. Such barrier effect is calculated to be stronger for increased seamount normal stress relative to the ambient level, for larger seamount height-to-width ratio, and for shorter seamount-to-nucleation distance. As the seamount height increases from 0 to 40% of its basal width, the required increase in the effective normal stress on the seamount to stop ruptures drops by as much as ∼20%. We further demonstrate that when a seamount is subducted adjacent to the earthquake nucleation zone, coseismic ruptures can be stopped even if the seamount has a lower effective normal stress than the ambient level. These results indicate that subducted seamounts may stop earthquake ruptures for a wide range of seamount normal stress conditions, including the case of the thrust fault being lubricated by seamount-top fluid-rich sediments, as suggested from observations in the Japan and Sunda Trenches. © 2013 American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84879923588&doi=10.1002%2fgrl.50509&partnerID=40&md5=f9adf15557387a7bb1cfcebbaa8d0b9b
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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/6252
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, United States
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| Recommended Citation: | |
Yang H.,Liu Y.,Lin J.. Geometrical effects of a subducted seamount on stopping megathrust ruptures[J]. Geophysical Research Letters,2013-01-01,40(10).
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