气候变化领域集成服务门户(CCPortal): Reactivation of an Intraplate Fault by Mine-Blasting Events: Implications to Regional Seismic Hazard in Western Canada

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DOI	10.1029/2020JB019933
	Reactivation of an Intraplate Fault by Mine-Blasting Events: Implications to Regional Seismic Hazard in Western Canada
	Dokht R.M.H.; Smith B.; Kao H.; Visser R.; Hutchinson J.
发表日期	2020
ISSN	21699313
卷号	125 期号:6
英文摘要	Mining activities are well known for being able to induce local seismicity but have not yet been shown to cause earthquakes over large distances. We analyze a particular group of seismic events recorded from 2014 to 2016 in north-central British Columbia (BC) that appear to be triggered by the activities at the Mount Milligan Mine. The spatial distribution of the studied events follows a NW-SE linear trend, with distances up to approximately 100 km from the mining site. To distinguish mining blasts from blasting-related and natural events, we adopt a multivariate decision tree based on each event's origin time, distance from the mine, and the pseudo-spectral acceleration ratios of the three-component waveforms. The calculated dynamic strains from blasts place a distance limit of 20 km for dynamic triggering. However, accounting for the estimated epicentral uncertainty and temporal distribution of the earthquakes' origin times support the existence of blasting-triggered events at larger distances (up to ∼50 km) from the mine, suggesting that a previously unmapped fault segment is close to critical state and may have been reactivated. The inferred fault segment aligns remarkably well with the southern extent of the Rocky Mountain Trench and may impose a significant hazard to nearby communities if the entire fault segment of about 150 km-long ruptures. ©2020 Her Majesty the Queen in Right of Canada Reproduced with the permission of the Minister of Natural Resources Canada.
英文关键词	Dynamic Triggering; Fault Reactivation; Pseudo Spectral Acceleration; Rocky Mountain Trench
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187799
作者单位	Geological Survey of Canada, Pacific Geoscience Centre, Natural Resources Canada, Sidney, BC, Canada; School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada
推荐引用方式 GB/T 7714	Dokht R.M.H.,Smith B.,Kao H.,et al. Reactivation of an Intraplate Fault by Mine-Blasting Events: Implications to Regional Seismic Hazard in Western Canada[J],2020,125(6).
APA	Dokht R.M.H.,Smith B.,Kao H.,Visser R.,&Hutchinson J..(2020).Reactivation of an Intraplate Fault by Mine-Blasting Events: Implications to Regional Seismic Hazard in Western Canada.Journal of Geophysical Research: Solid Earth,125(6).
MLA	Dokht R.M.H.,et al."Reactivation of an Intraplate Fault by Mine-Blasting Events: Implications to Regional Seismic Hazard in Western Canada".Journal of Geophysical Research: Solid Earth 125.6(2020).