气候变化领域集成服务门户(CCPortal): Does Retrogression Always Account for the Large Volume of Submarine Megaslides? Evidence to the Contrary From the Tampen Slide, Offshore Norway

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DOI	10.1029/2020JB020655
	Does Retrogression Always Account for the Large Volume of Submarine Megaslides? Evidence to the Contrary From the Tampen Slide, Offshore Norway
	Barrett R.S.; Bellwald B.; Talling P.J.; Micallef A.; Gross F.; Berndt C.; Planke S.; Myklebust R.; Krastel S.
发表日期	2021
ISSN	21699313
卷号	126 期号:2
英文摘要	Submarine landslides can be several orders of magnitude larger than their terrestrial counterparts and can pose significant hazards across entire ocean basins. The landslide failure mechanism strongly controls the associated tsunami hazard. The Tampen Slide offshore Norway is one of the largest landslides on Earth but remains poorly understood due to its subsequent burial beneath up to 450 m of sediments. Here, we use laterally extensive (16,000 km2), high-resolution processed 3-D seismic reflection data to characterize the upper Tampen Slide. We identify longitudinal (downslope, movement-parallel) chutes and ridges that are up to 40 m high, as well as extensional and compressional (cross-slope) ridges. This is the first time that longitudinal ridges of such size have been imaged in a deep marine setting. The first phase of the Tampen Slide involved the simultaneous translation of over 720 km3 of sediments along a single failure plane. This was followed by spreading along the head- and sidewall, and the formation of a retrogressive debris flow and slump, the volumes of which are insignificant compared to the first failure. The process responsible for movement of such a large sediment volume along a single glide plane differs significantly from that of other passive margin megaslides, which typically comprise numerous smaller landslides that fail retrogressively along multiple glide planes. The trigger mechanism (e.g., an earthquake), the presence of mechanically strong obstructions (e.g., volcanic structural high), and the number and location of weak layers may be key factors that determine whether megaslides develop along a single plane or retrogressively. © 2020. The Authors.
英文关键词	failure mechanism; glide plane; longitudinal ridges; submarine landslide; Tampen Slide
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/187336
作者单位	Institute of Geosciences, Christian-Albrechts-University, Kiel, Germany; Volcanic Basin Petroleum Research AS, Oslo, Norway; Departments of Earth Sciences and Geography, Durham University, Durham, United Kingdom; Marine Geology & Seafloor Surveying, Department of Geosciences, University of Malta, Msida, Malta; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Center for Ocean and Society, Kiel Marine Science, Christian-Albrechts-University, Kiel, Germany; Centre for Earth Evolution and Dynamics, University of Oslo, Oslo, Norway; TGS, Asker, Norway
推荐引用方式 GB/T 7714	Barrett R.S.,Bellwald B.,Talling P.J.,et al. Does Retrogression Always Account for the Large Volume of Submarine Megaslides? Evidence to the Contrary From the Tampen Slide, Offshore Norway[J],2021,126(2).
APA	Barrett R.S..,Bellwald B..,Talling P.J..,Micallef A..,Gross F..,...&Krastel S..(2021).Does Retrogression Always Account for the Large Volume of Submarine Megaslides? Evidence to the Contrary From the Tampen Slide, Offshore Norway.Journal of Geophysical Research: Solid Earth,126(2).
MLA	Barrett R.S.,et al."Does Retrogression Always Account for the Large Volume of Submarine Megaslides? Evidence to the Contrary From the Tampen Slide, Offshore Norway".Journal of Geophysical Research: Solid Earth 126.2(2021).