Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/s41561-017-0007-2 |
Links between sediment consolidation and Cascadia megathrust slip behaviour | |
Han, Shuoshuo1; Bangs, Nathan L.1; Carbotte, Suzanne M.2; Saffer, Demian M.3,4; Gibson, James C.2 | |
2017-12-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:12 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | At sediment-rich subduction zones, megathrust slip behaviour and forearc deformation are tightly linked to the physical properties and in situ stresses within underthrust and accreted sediments. Yet the role of sediment consolidation at the onset of subduction in controlling the downdip evolution and along-strike variation in megathrust fault properties and accretionary wedge structure is poorly known. Here we use controlled-source seismic data combined with ocean drilling data to constrain the sediment consolidation and in situ stress state near the deformation front of the Cascadia subduction zone. Offshore Washington where the megathrust is inferred to be strongly locked, we find over-consolidated sediments near the deformation front that are incorporated into a strong outer wedge, with little sediment subducted. These conditions are favourable for strain accumulation on the megathrust and potential earthquake rupture close to the trench. In contrast, offshore Central Oregon, a thick under-consolidated sediment sequence is subducting, and is probably associated with elevated pore fluid pressures on the megathrust in a region where reduced locking is inferred. Our results suggest that the consolidation state of the sediments near the deformation front is a key factor contributing to megathrust slip behaviour and its along-strike variation, and it may also have a significant role in the deformation style of the accretionary wedge. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416858000019 |
WOS关键词 | OREGON ACCRETIONARY PRISM ; SUBDUCTION ZONE ; LANDWARD VERGENCE ; NANKAI TROUGH ; FORE-ARC ; SEISMIC VELOCITY ; REFLECTION DATA ; FLUID PRESSURE ; PORE PRESSURE ; NEW-ZEALAND |
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/34945 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Texas Austin, Inst Geophys, Jackson Sch Geosci, Austin, TX 78712 USA; 2.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY USA; 3.Penn State Univ, Dept Geosci, University Pk, PA 16802 USA; 4.Penn State Univ, Ctr Geomech Geofluids & Geohazards, University Pk, PA 16802 USA |
推荐引用方式 GB/T 7714 | Han, Shuoshuo,Bangs, Nathan L.,Carbotte, Suzanne M.,et al. Links between sediment consolidation and Cascadia megathrust slip behaviour[J]. NATURE GEOSCIENCE,2017,10(12). |
APA | Han, Shuoshuo,Bangs, Nathan L.,Carbotte, Suzanne M.,Saffer, Demian M.,&Gibson, James C..(2017).Links between sediment consolidation and Cascadia megathrust slip behaviour.NATURE GEOSCIENCE,10(12). |
MLA | Han, Shuoshuo,et al."Links between sediment consolidation and Cascadia megathrust slip behaviour".NATURE GEOSCIENCE 10.12(2017). |
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