DOI: 10.1038/ngeo1770
论文题名: The long precursory phase of most large interplate earthquakes
作者: Bouchon M. ; Durand V. ; Marsan D. ; Karabulut H. ; Schmittbuhl J.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期: 4 起始页码: 299
结束页码: 302
语种: 英语
Scopus关键词: earthquake epicenter
; earthquake rupture
; instrumentation
; intraplate process
; plate boundary
; risk factor
; seismic anisotropy
; Pacific Ocean
; Pacific Ocean (North)
英文摘要: Many earthquakes are preceded by foreshocks. However, the mechanisms that generate foreshocks and the reason why they occur before some earthquakes and not others are unknown. Here we use seismic catalogues from the best instrumented areas of the North Pacific to analyse the foreshock sequences preceding all earthquakes there between 1999 and 2011, of magnitude larger than 6.5 and at depths shallower than 50 km. The data set comprises 31 earthquakes at plate boundaries, and 31 in plate interiors. We find that there is a remarkable contrast between the foreshock sequences of interplate compared with intraplate earthquakes. Most large earthquakes at plate interfaces in the North Pacific were preceded by accelerating seismic activity in the months to days leading up to the mainshock. In contrast, foreshocks are much less frequent in intraplate settings. We suggest that at plate boundaries, the interface between the two plates begins to slowly slip before the interface ruptures in a large earthquake. This relatively long precursory phase could help mitigate earthquake risk at plate boundaries. © 2013 Macmillan Publishers Limited. All rights reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106823
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Centre National de la Recherche Scientifique, Université Joseph Fourier, Grenoble, ISTerre, BP 53, 38041 Grenoble, France; Université de Savoie, ISTerre, 73376 Le Bourget du Lac, France; Kandilli Observatory and Earthquake Research Institute, Bogaziçi University, KOERI, 81220 Cengelköy, Istanbul, Turkey; Centre National de la Recherche Scientifique, Université de Strasbourg, EOST, 5 rue Descartes, 67084 Strasbourg, France
Recommended Citation:
Bouchon M.,Durand V.,Marsan D.,et al. The long precursory phase of most large interplate earthquakes[J]. Nature Geoscience,2013-01-01,6(4)