globalchange  > 气候减缓与适应
DOI: 10.1038/s41561-017-0013-4
论文题名:
Past seismic slip-to-the-trench recorded in Central America megathrust
作者: Vannucchi P.; Spagnuolo E.; Aretusini S.; Di Toro G.; Ujiie K.; Tsutsumi A.; Nielsen S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:12
起始页码: 935
结束页码: 940
语种: 英语
Scopus关键词: coseismic process ; geological structure ; Miocene ; Ocean Drilling Program ; offshore application ; ooze ; plate boundary ; Pleistocene ; seismic reflection ; subduction zone ; thrust ; Tohoku earthquake 2011 ; trench ; Central America ; Costa Rica
英文摘要: The 2011 Tōhoku-Oki earthquake revealed that co-seismic displacement along the plate boundary megathrust can propagate to the trench. Co-seismic slip to the trench amplifies hazards at subduction zones, so its historical occurrence should also be investigated globally. Here we combine structural and experimental analyses of core samples taken offshore from southeastern Costa Rica as part of the Integrated Ocean Drilling Program (IODP) Expedition 344, with three-dimensional seismic reflection images of the subduction zone. We document a geologic record of past co-seismic slip to the trench. The core passed through a less than 1.9-million-year-old megathrust frontal ramp that superimposes older Miocene biogenic oozes onto late Miocene-Pleistocene silty clays. This, together with our stratigraphic analyses and geophysical images, constrains the position of the basal decollement to lie within the biogenic oozes. Our friction experiments show that, when wet, silty clays and biogenic oozes are both slip-weakening at sub-seismic and seismic slip velocities. Oozes are stronger than silty clays at slip velocities of less than or equal to 0.01 m s-1, and wet oozes become as weak as silty clays only at a slip velocity of 1 m s-1. We therefore suggest that the geological structures found offshore from Costa Rica were deformed during seismic slip-to-the-trench events. During slower aseismic creep, deformation would have preferentially localized within the silty clays. © 2017 The Author(s).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105664
Appears in Collections:气候减缓与适应
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作者单位: Department of Earth Sciences, Royal Holloway, University of London, Egham, United Kingdom; Dipartimento di Scienze della Terra Università di Firenze, Firenze, Italy; Sezione di Sismologia e Tettonofisica, Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy; School of Earth, Atmospheric and Environmental Sciences, Manchester University, Manchester, United Kingdom; Dipartimento di Geoscienze, Università di Padova, Padova, Italy; Department of Geosciences, University of Tsukuba, Tsukuba, Japan; Graduate School of Science, Kyoto University, Kyoto, Japan; Department of Earth Sciences, University of Durham, Durham, United Kingdom

Recommended Citation:
Vannucchi P.,Spagnuolo E.,Aretusini S.,et al. Past seismic slip-to-the-trench recorded in Central America megathrust[J]. Nature Geoscience,2017-01-01,10(12)
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