气候变化领域集成服务门户(CCPortal): Mechanical Implications of Creep and Partial Coupling on the World's Fastest Slipping Low-Angle Normal Fault in Southeastern Papua New Guinea

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DOI	10.1029/2020JB020117
	Mechanical Implications of Creep and Partial Coupling on the World's Fastest Slipping Low-Angle Normal Fault in Southeastern Papua New Guinea
	Biemiller J.; Boulton C.; Wallace L.; Ellis S.; Little T.; Mizera M.; Niemeijer A.; Lavier L.
发表日期	2020
ISSN	21699313
卷号	125 期号:10
英文摘要	We use densely spaced campaign GPS observations and laboratory friction experiments on fault rocks from one of the world's most rapidly slipping low-angle normal faults, the Mai'iu fault in Papua New Guinea, to investigate the nature of interseismic deformation on active low-angle normal faults. GPS velocities reveal 8.3 ± 1.2 mm/year of horizontal extension across the Mai'iu fault, and are fit well by dislocation models with shallow fault locking (above 2 km depth), or by deeper locking (from ~5–16 km depth) together with shallower creep. Laboratory friction experiments show that gouges from the shallowest portion of the fault zone are predominantly weak and velocity-strengthening, while fault rocks deformed at greater depths are stronger and velocity-weakening. Evaluating the geodetic and friction results together with geophysical and microstructural evidence for mixed-mode seismic and aseismic slip at depth, we find that the Mai'iu fault is most likely strongly locked at depths of ~5–16 km and creeping updip and downdip of this region. Our results suggest that the Mai'iu fault and other active low-angle normal faults can slip in large (Mw > 7) earthquakes despite near-surface interseismic creep on frictionally stable clay-rich gouges. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	GPS; low-angle normal fault; normal fault; rate-and-state friction; seismic stability; Woodlark Rift
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/187534
作者单位	Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; School of Geography, Environment and Earth Sciences, Victoria University of Wellington, Wellington, New Zealand; GNS Science, Lower Hutt, New Zealand; Faculty of Geosciences, Utrecht University, Utrecht, Netherlands
推荐引用方式 GB/T 7714	Biemiller J.,Boulton C.,Wallace L.,et al. Mechanical Implications of Creep and Partial Coupling on the World's Fastest Slipping Low-Angle Normal Fault in Southeastern Papua New Guinea[J],2020,125(10).
APA	Biemiller J..,Boulton C..,Wallace L..,Ellis S..,Little T..,...&Lavier L..(2020).Mechanical Implications of Creep and Partial Coupling on the World's Fastest Slipping Low-Angle Normal Fault in Southeastern Papua New Guinea.Journal of Geophysical Research: Solid Earth,125(10).
MLA	Biemiller J.,et al."Mechanical Implications of Creep and Partial Coupling on the World's Fastest Slipping Low-Angle Normal Fault in Southeastern Papua New Guinea".Journal of Geophysical Research: Solid Earth 125.10(2020).