Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1002/2017GL074537 |
Submarine landslide and tsunami hazards offshore southern Alaska: Seismic strengthening versus rapid sedimentation | |
Sawyer, Derek E.1; Reece, Robert S.2; Gulick, Sean P. S.3; Lenz, Brandi L.1 | |
2017-08-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:16 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The southern Alaskan offshore margin is prone to submarine landslides and tsunami hazards due to seismically active plate boundaries and extreme sedimentation rates from glacially enhanced mountain erosion. We examine the submarine landslide potential with new shear strength measurements acquired by Integrated Ocean Drilling Program Expedition 341 on the continental slope and Surveyor Fan. These data reveal lower than expected sediment strength. Contrary to other active margins where seismic strengthening enhances slope stability, the high-sedimentation margin offshore southern Alaska behaves like a passive margin from a shear strength perspective. We interpret that seismic strengthening occurs but is offset by high sedimentation rates and overpressure. This conclusion is supported by shear strength outside of the fan that follow an active margin trend. More broadly, seismically active margins with wet-based glaciers are susceptible to submarine landslide hazards because of the combination of high sedimentation rates and earthquake shaking. Shear strength is lower than expected offshore southern Alaska Low shear strength enhances susceptibility to submarine slope failure and tsunami hazards Seismic strengthening is counteracted by the high sedimentation rates from glacially enhanced erosion of coastal mountains Plain Language Summary The southern Alaskan offshore margin is prone to submarine landslides and tsunami hazards due to seismically active plate boundaries and extreme sedimentation rates from glacially enhanced mountain erosion. We examine the submarine landslide potential with new shear strength measurements. We interpret the lower strength is due primarily to the high sedimentation rates and resulting sediment overpressure. This conclusion is supported by comparing shear strength measured outside of the high-sedimentation area, that exhibit expected typical active margin shear strength. This study reveals lower-than-expected sediment strength offshore southern Alaska and is thus more susceptible to submarine landslides and associated tsunami hazards than previously thought. Tsunamis generated off southern Alaska can impact other Pacific coastal locations. More broadly, seismically active margins with wet-based glaciers are susceptible to submarine landslide hazards because of the combination of high sedimentation rates and earthquake shaking. |
英文关键词 | submarine landslides seismic strengthening shear strength surveyor fan Alaska IODP Expedition 341 |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000410658800041 |
WOS关键词 | ST ELIAS OROGEN ; CONTINENTAL-SLOPE ; EARTHQUAKE ; OVERPRESSURE ; STABILITY ; TROUGH ; ZONE ; GULF ; FAN |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28672 |
专题 | 气候变化 |
作者单位 | 1.Ohio State Univ, Sch Earth Sci, Columbus, OH 43210 USA; 2.Texas A&M Univ, Dept Geol & Geophys, College Stn, TX USA; 3.Univ Texas Austin, Jackson Sch Geosci, Austin, TX 78712 USA |
推荐引用方式 GB/T 7714 | Sawyer, Derek E.,Reece, Robert S.,Gulick, Sean P. S.,et al. Submarine landslide and tsunami hazards offshore southern Alaska: Seismic strengthening versus rapid sedimentation[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(16). |
APA | Sawyer, Derek E.,Reece, Robert S.,Gulick, Sean P. S.,&Lenz, Brandi L..(2017).Submarine landslide and tsunami hazards offshore southern Alaska: Seismic strengthening versus rapid sedimentation.GEOPHYSICAL RESEARCH LETTERS,44(16). |
MLA | Sawyer, Derek E.,et al."Submarine landslide and tsunami hazards offshore southern Alaska: Seismic strengthening versus rapid sedimentation".GEOPHYSICAL RESEARCH LETTERS 44.16(2017). |
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