DOI: 10.1016/j.epsl.2017.11.020
Scopus记录号: 2-s2.0-85035112310
论文题名: Foreshocks and delayed triggering of the 2016 MW7.1 Te Araroa earthquake and dynamic reinvigoration of its aftershock sequence by the MW7.8 Kaikōura earthquake, New Zealand
作者: Warren-Smith E. ; Fry B. ; Kaneko Y. ; Chamberlain C.J.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 482 起始页码: 265
结束页码: 276
语种: 英语
英文关键词: aftershocks
; dynamic triggering
; foreshocks
; Hikurangi
; matched-filter
; seismicity
Scopus关键词: Faulting
; Geophysics
; Matched filters
; Surface waves
; aftershocks
; Dynamic triggering
; foreshocks
; Hikurangi
; seismicity
; Earthquakes
; aftershock
; earthquake catalogue
; earthquake event
; earthquake trigger
; foreshock
; seismicity
; subduction
; Hikurangi
; Kaikoura
; Marlborough
; New Zealand
; North Island
; Northland
; South Island
英文摘要: We analyze the preparatory period of the September 2016 MW7.1 Te Araroa foreshock–mainshock sequence in the Northern Hikurangi margin, New Zealand, and subsequent reinvigoration of Te Araroa aftershocks driven by a large distant earthquake (the November 2016 MW7.8 Kaikōura earthquake). By adopting a matched-filter detection workflow using 582 well-defined template events, we generate an improved foreshock and aftershock catalog for the Te Araroa sequence (>8,000 earthquakes over 66 d). Templates characteristic of the MW7.1 sequence (including the mainshock template) detect several highly correlating events (ML2.5–3.5) starting 12 min after a MW5.7 foreshock. These pre-cursory events occurred within ∼1 km of the mainshock and migrate bilaterally, suggesting precursory slip was triggered by the foreshock on the MW7.1 fault patch prior to mainshock failure. We extend our matched-filter routine to examine the interactions between high dynamic stresses resulting from passing surface waves of the November 2016 MW7.8 Kaikōura earthquake, and the evolution of the Te Araroa aftershock sequence. We observe a sudden spike in moment release of the aftershock sequence immediately following peak dynamic Coulomb stresses of 50–150 kPa on the MW7.1 fault plane. The triggered increase in moment release culminated in a MW5.1 event, immediately followed by a ∼3 h temporal stress shadow. Our observations document the preparatory period of a major subduction margin earthquake following a significant foreshock, and quantify dynamic reinvigoration of a distant on-going major aftershock sequence amid a period of temporal clustering of seismic activity in New Zealand. © 2017 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110115
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: GNS Science, P.O. Box 30-368, Lower Hutt, 5040, New Zealand; Institute of Geophysics, School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand
Recommended Citation:
Warren-Smith E.,Fry B.,Kaneko Y.,et al. Foreshocks and delayed triggering of the 2016 MW7.1 Te Araroa earthquake and dynamic reinvigoration of its aftershock sequence by the MW7.8 Kaikōura earthquake, New Zealand[J]. Earth and Planetary Science Letters,2018-01-01,482