DOI: 10.1002/2013GL058886
论文题名: Modeling the seismic cycle in subduction zones: The role and spatiotemporal occurrence of off-megathrust earthquakes
作者: Van Dinther Y. ; Mai P.M. ; Dalguer L.A. ; Gerya T.V.
刊名: Geophysical Research Letters
ISSN: 0094-10348
EISSN: 1944-10079
出版年: 2014
卷: 41, 期: 4 起始页码: 1194
结束页码: 1201
语种: 英语
英文关键词: dynamic Coulomb wedge theory
; off-megathrust seismicity
; seismic cycle
; seismo-thermo-mechanical modeling
; subduction zone
; tsunami
Scopus关键词: Hazards
; Seismology
; Tsunamis
; Analytical predictions
; Hazard Assessment
; off-megathrust seismicity
; Quasi-static stress
; seismic cycle
; Stress transfer
; Subduction zones
; Viscoelasto plastics
; Dynamics
; earthquake epicenter
; earthquake trigger
; geometry
; hazard assessment
; numerical model
; seismic anisotropy
; seismology
; spatiotemporal analysis
; subduction zone
; two-dimensional modeling
英文摘要: Shallow off-megathrust subduction events are important in terms of hazard assessment and coseismic energy budget. Their role and spatiotemporal occurrence, however, remain poorly understood. We simulate their spontaneous activation and propagation using a newly developed 2-D, physically consistent, continuum, viscoelastoplastic seismo-thermo-mechanical modeling approach. The characteristics of simulated normal events within the outer rise and splay and normal antithetic events within the wedge resemble seismic and seismological observations in terms of location, geometry, and timing. Their occurrence agrees reasonably well with both long-term analytical predictions based on dynamic Coulomb wedge theory and short-term quasi-static stress changes resulting from the typically triggering megathrust event. The impact of off-megathrust faulting on the megathrust cycle is distinct, as more both shallower and slower megathrust events arise due to occasional off-megathrust triggering and increased updip locking. This also enhances tsunami hazards, which are amplified due to the steeply dipping fault planes of especially outer rise events. Key Points Simulated spontaneous outer rise and wedge events agree geometrically with nature Stress transfer and dynamic Coulomb wedge theory explain their occurrence They increase megathrust event recurrence and complexity, and tsunami hazard ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84894557917&doi=10.1002%2f2013GL058886&partnerID=40&md5=cc6817ea526d7da6d271831490534799
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/7612
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Swiss Seismological Service, ETH Zürich, Zürich, Switzerland
Recommended Citation:
Van Dinther Y.,Mai P.M.,Dalguer L.A.,et al. Modeling the seismic cycle in subduction zones: The role and spatiotemporal occurrence of off-megathrust earthquakes[J]. Geophysical Research Letters,2014-01-01,41(4).