Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/s41561-018-0061-4 |
Corrugated megathrust revealed offshore from Costa Rica | |
Edwards, Joel H.1; Kluesner, Jared W.2; Silver, Eli A.1; Brodsky, Emily E.1; Brothers, Daniel S.2; Bangs, Nathan L.3; Kirkpatrick, James D.4; Wood, Ruby1; Okamoto, Kristina1 | |
2018-03-01 | |
发表期刊 | NATURE GEOSCIENCE
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ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:3页码:197-+ |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Canada |
英文摘要 | Exhumed faults are rough, often exhibiting topographic corrugations oriented in the direction of slip; such features are fundamental to mechanical processes that drive earthquakes and fault evolution. However, our understanding of corrugation genesis remains limited due to a lack of in situ observations at depth, especially at subducting plate boundaries. Here we present three-dimensional seismic reflection data of the Costa Rica subduction zone that image a shallow megathrust fault characterized by corrugated, and chaotic and weakly corrugated topographies. The corrugated surfaces extend from near the trench to several kilometres down-dip, exhibit high reflection amplitudes (consistent with high fluid content/pressure) and trend 11-18 degrees oblique to subduction, suggesting 15 to 25 mm yr(-1) of trench-parallel slip partitioning across the plate boundary. The corrugations form along portions of the megathrust with greater cumulative slip and may act as fluid conduits. In contrast, weakly corrugated areas occur adjacent to active plate bending faults where the megathrust has migrated up-section, forming a nascent fault surface. The variations in megathrust roughness imaged here suggest that abandonment and then reestablishment of the megathrust up-section transiently increases fault roughness. Analogous corrugations may exist along significant portions of subduction megathrusts globally. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000426311500013 |
WOS关键词 | SCALE GLACIAL LINEATIONS ; EARTHQUAKE ; MOTION ; SURFACES ; RIDGE ; SLIP ; DIP |
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/35122 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Calif Santa Cruz, Dept Earth & Planetary Sci, Santa Cruz, CA 95064 USA; 2.US Geol Survey, Pacific Coastal & Marine Sci Ctr, Santa Cruz, CA USA; 3.Univ Texas Austin, Inst Geophys, Austin, TX USA; 4.McGill Univ, Earth & Planetary Sci, Montreal, PQ, Canada |
推荐引用方式 GB/T 7714 | Edwards, Joel H.,Kluesner, Jared W.,Silver, Eli A.,et al. Corrugated megathrust revealed offshore from Costa Rica[J]. NATURE GEOSCIENCE,2018,11(3):197-+. |
APA | Edwards, Joel H..,Kluesner, Jared W..,Silver, Eli A..,Brodsky, Emily E..,Brothers, Daniel S..,...&Okamoto, Kristina.(2018).Corrugated megathrust revealed offshore from Costa Rica.NATURE GEOSCIENCE,11(3),197-+. |
MLA | Edwards, Joel H.,et al."Corrugated megathrust revealed offshore from Costa Rica".NATURE GEOSCIENCE 11.3(2018):197-+. |
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