DOI: 10.1785/0120190121
论文题名: Variability of etas parameters in global subduction zones and applications to mainshock–aftershock hazard assessment
作者: Zhang L. ; Werner M.J. ; Goda K.
刊名: Bulletin of the Seismological Society of America
ISSN: 371106
出版年: 2020
卷: 110, 期: 1 语种: 英语
Scopus关键词: Earthquake effects
; Hazards
; Aftershock distributions
; Epidemic-type aftershock sequences
; Finite size effect
; Individual sequences
; Megathrust earthquakes
; Subduction interface
; Synthetic catalogs
; Tohoku earthquakes
; Parameter estimation
; aftershock
; earthquake catalogue
; earthquake event
; earthquake magnitude
; earthquake trigger
; hazard assessment
; seismic hazard
; subduction zone
; thrust fault
英文摘要: Megathrust earthquake sequences can impact buildings and infrastructure due to not only the mainshock but also the triggered aftershocks along the subduction interface and in the overriding crust. To give realistic ranges of aftershock simulations in regions with limited data and to provide time-dependent seismic hazard information right after a future giant shock, we assess the variability of the epidemic-type aftershock sequence (ETAS) model parameters in subduction zones that have experienced M ≥ 7:5 earthquakes, comparing estimates from long time windows with those from individual sequences. Our results show that the ETAS parameters are more robust if estimated from a long catalog than from individual sequences, given individual sequences have fewer data including missing early aftershocks. Considering known biases of the parameters (due to model formulation, the isotropic spatial aftershock distribution, and finite size effects of catalogs), we conclude that the variability of the ETAS parameters that we observe from robust estimates is not significant, neither across different subduction-zone regions nor as a function of maximum observed magnitudes. We also find that ETAS parameters do not change when multiple M 8.0–9.0 events are included in a region, mainly because an M 9.0 sequence dominates the number of events in the catalog. Based on the ETAS parameter estimates in the long time period window, we propose a set of ETAS parameters for future M 9.0 sequences for aftershock hazard assessment (K0 0:04 0:02, α 2:3, c 0:03 0:01, p 1:21 0:08, γ 1:61 0:29, d 23:48 18:17, and q 1:68 0:55). Synthetic catalogs created with the suggested ETAS parameters show good agreement with three observed M 9.0 sequences since 1965 (the 2004 M 9.1 Aceh–Andaman earthquake, the 2010 M 8.8 Maule earthquake, and the 2011 M 9.0 Tohoku earthquake). © Seismological Society of America. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159718
Appears in Collections: 气候变化与战略
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作者单位: Department of Civil Engineering, University of Bristol, Bristol, United Kingdom; School of Earth Sciences, University of Bristol, Bristol, United Kingdom; Department of Earth Sciences, The University of Western Ontario, London, ON, Canada
Recommended Citation:
Zhang L.,Werner M.J.,Goda K.. Variability of etas parameters in global subduction zones and applications to mainshock–aftershock hazard assessment[J]. Bulletin of the Seismological Society of America,2020-01-01,110(1)