气候变化领域集成服务门户(CCPortal): Postseismic Deformation due to the 2012 M w 7.8 Haida Gwaii and 2013 M w 7.5 Craig Earthquakes and its Implications for Regional Rheological Structure

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DOI	10.1029/2020JB020197
	Postseismic Deformation due to the 2012 M w 7.8 Haida Gwaii and 2013 M w 7.5 Craig Earthquakes and its Implications for Regional Rheological Structure
	Tian Z.; Freymueller J.T.; Yang Z.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	Observations of ∼7 years of postseismic deformation following the 2012 M w 7.8 Haida Gwaii and 2013 M w 7.5 Craig earthquakes in western British Columbia and southeastern Alaska provides insight into the regional rheologic structure and seismological hazards. A stress-driven afterslip-only model cannot alone explain rates or spatial patterns of the far field and later stage postseismic deformation measured by Global Positioning System (GPS). We thus develop an integrated model that fits the observations by combining afterslip on the deeper extension of the faults and distributed viscous flow in the asthenosphere. The best-fit integrated model has a 60-km thick lithosphere overlying a Burgers body asthenosphere with a Maxwell viscosity of 2 × 1019 Pa s (0.8–3 × 1019 Pa s at 95% confidence), with a Kelvin viscosity assumed equal to 10% of that value. These values are in good agreement with rheological models derived from glacial isostatic adjustment data. The early, near-field postseismic deformation from both events is dominated by their corresponding afterslip, however, throughout the Craig postseismic period, the dominant mechanism in the far field is viscoelastic relaxation. For the intermediate region between the two earthquakes, both events contribute to the observed postseismic displacements. Because there was no obvious afterslip following the Haida Gwaii event or known large historical earthquakes on the southernmost part of the QCF, this region continues to have great potential to suffer a large earthquake in the future. © 2021. American Geophysical Union. All Rights Reserved.
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/187342
作者单位	School of Geology Engineering and Geomatics, Chang'an University, Xi'an, China; Department of Earth and Environmental Sciences, Michigan State University, East Lansing, MI, United States
推荐引用方式 GB/T 7714	Tian Z.,Freymueller J.T.,Yang Z.. Postseismic Deformation due to the 2012 M w 7.8 Haida Gwaii and 2013 M w 7.5 Craig Earthquakes and its Implications for Regional Rheological Structure[J],2021,126(2).
APA	Tian Z.,Freymueller J.T.,&Yang Z..(2021).Postseismic Deformation due to the 2012 M w 7.8 Haida Gwaii and 2013 M w 7.5 Craig Earthquakes and its Implications for Regional Rheological Structure.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Tian Z.,et al."Postseismic Deformation due to the 2012 M w 7.8 Haida Gwaii and 2013 M w 7.5 Craig Earthquakes and its Implications for Regional Rheological Structure".Journal of Geophysical Research: Solid Earth 126.2(2021).