DOI: 10.1002/2014GL062982
论文题名: Rupture dynamics and ground motions from earthquakes in 2-D heterogeneous media
作者: Bydlon S.A. ; Dunham E.M.
刊名: Geophysical Research Letters
ISSN: 0094-8848
EISSN: 1944-8579
出版年: 2015
卷: 42, 期: 6 起始页码: 1701
结束页码: 1709
语种: 英语
英文关键词: ground motion
; heterogeneity
; high frequency
; rupture dynamics
; scattering
Scopus关键词: Earthquakes
; Faulting
; Power spectral density
; Scattering
; Spectral density
; Correlation lengths
; Ground motions
; Heterogeneity
; Heterogeneous media
; High frequency HF
; Material heterogeneity
; Near-fault regions
; Rupture velocities
; Incoherent scattering
; amplitude
; fault propagation
; ground motion
; heterogeneity
; rupture
; simulation
; Anas
英文摘要: We perform 2-D simulations of earthquakes on rough faults in media with random heterogeneities (with von Karman distribution) to study the effects of geometric and material heterogeneity on the rupture process and resulting high-frequency ground motions in the near-fault region (out to ∼20km). Variations in slip and rupture velocity can arise from material heterogeneity alone but are dominantly controlled by fault roughness. Scattering effects become appreciable beyond ∼3km from the fault. Near-fault scattering extends the duration of incoherent, high-frequency ground motions and, at least in our 2-D simulations, elevates root-mean-square accelerations (i.e., Arias intensity) with negligible reduction in peak velocities. We also demonstrate that near-fault scattering typically occurs in the power law tail of the power spectral density function, quantified by the Hurst exponent and another parameter combining standard deviation and correlation length. Key Points Fault roughness, not material heterogeneity, dominates rupture process Introduce parameter that can be used to quantify near-fault scattering Scattering affects the duration and amplitude of high-frequency ground motions ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84927785660&doi=10.1002%2f2014GL062982&partnerID=40&md5=aabb8300efb9139fab86e4a96c70679d
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/8464
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Department of Geophysics, Stanford University, Stanford, CA, United States
Recommended Citation:
Bydlon S.A.,Dunham E.M.. Rupture dynamics and ground motions from earthquakes in 2-D heterogeneous media[J]. Geophysical Research Letters,2015-01-01,42(6).