DOI: 10.1002/2014GL059411
论文题名: Expected seismic shaking in Los Angeles reduced by San Andreas fault zone plasticity
作者: Roten D. ; Olsen K.B. ; Day S.M. ; Cui Y. ; Fäh D.
刊名: Geophysical Research Letters
ISSN: 0094-10134
EISSN: 1944-9865
出版年: 2014
卷: 41, 期: 8 起始页码: 2769
结束页码: 2777
语种: 英语
英文关键词: nonlinear material behavior
; plastic yielding
; San Andreas Fault
; ShakeOut
Scopus关键词: Adhesion
; Computer simulation
; Plasticity
; Strike-slip faults
; Viscoelasticity
; Amplification effects
; Drucker-Prager plasticities
; Long-period ground motions
; Nonlinear material behavior
; Plastic yielding
; San Andreas fault
; ShakeOut
; Visco-elastic mediums
; Earthquakes
; computer simulation
; earthquake magnitude
; earthquake rupture
; fault zone
; ground motion
; kinematics
; nonlinearity
; plasticity
; San Andreas Fault
; sedimentary basin
; California
; Los Angeles Basin
; Los Angeles [California]
; United States
英文摘要: Computer simulations of large (M≥7.8) earthquakes rupturing the southern San Andreas Fault from SE to NW (e.g., ShakeOut, widely used for earthquake drills) have predicted strong long-period ground motions in the densely populated Los Angeles Basin due to channeling of waves through a series of interconnected sedimentary basins. Recently, the importance of this waveguide amplification effect for seismic shaking in the Los Angeles Basin has also been confirmed from observations of the ambient seismic field. By simulating the ShakeOut earthquake scenario (based on a kinematic source description) for a medium governed by Drucker-Prager plasticity, we show that nonlinear material behavior could reduce the earlier predictions of large long-period ground motions in the Los Angeles Basin by up to 70% as compared to viscoelastic solutions. These reductions are primarily due to yielding near the fault, although yielding may also occur in the shallow low-velocity deposits of the Los Angeles Basin if cohesions are close to zero. Fault zone plasticity remains important even for conservative values of cohesions, suggesting that current simulations assuming a linear response of rocks are overpredicting ground motions during future large earthquakes on the southern San Andreas Fault. Key Points We simulate the M 7.8 ShakeOut earthquake scenario for an elastoplastic medium Peak ground velocities are reduced by 30-70% compared to a viscoelastic medium These reductions are mostly caused by plastic yielding in the fault zone ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84899036482&doi=10.1002%2f2014GL059411&partnerID=40&md5=a8d6e33ca57c724483c8c7f4de3ce9d3
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7398
Appears in Collections: 气候减缓与适应
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作者单位: Swiss Seismological Service, ETH Zurich, Zurich, Switzerland
Recommended Citation:
Roten D.,Olsen K.B.,Day S.M.,et al. Expected seismic shaking in Los Angeles reduced by San Andreas fault zone plasticity[J]. Geophysical Research Letters,2014-01-01,41(8).