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DOI | 10.1038/s41561-017-0013-4 |
Past seismic slip-to-the-trench recorded in Central America megathrust | |
Vannucchi, Paola1,2; Spagnuolo, Elena3; Aretusini, Stefano4; Di Toro, Giulio4,5; Ujiie, Kohtaro6; Tsutsumi, Akito7; Nielsen, Stefan8 | |
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 | England; Italy; Japan |
英文摘要 | The 2011 Tohoku-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. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000416858000016 |
WOS关键词 | 2011 TOHOKU EARTHQUAKE ; RUPTURE |
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/34870 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Royal Holloway Univ London, Dept Earth Sci, Egham, Surrey, England; 2.Univ Firenze, Dipartimento Sci Terra, Florence, Italy; 3.Ist Nazl Geofis & Vulcanol, Sez Sismol & Tettonofis, Rome, Italy; 4.Univ Manchester, Sch Earth Atmospher & Environm Sci, Manchester, Lancs, England; 5.Univ Padua, Dipartimento Geosci, Padua, Italy; 6.Univ Tsukuba, Dept Geosci, Tsukuba, Ibaraki, Japan; 7.Kyoto Univ, Grad Sch Sci, Kyoto, Japan; 8.Univ Durham, Dept Earth Sci, Durham, England |
推荐引用方式 GB/T 7714 | Vannucchi, Paola,Spagnuolo, Elena,Aretusini, Stefano,et al. Past seismic slip-to-the-trench recorded in Central America megathrust[J]. NATURE GEOSCIENCE,2017,10(12). |
APA | Vannucchi, Paola.,Spagnuolo, Elena.,Aretusini, Stefano.,Di Toro, Giulio.,Ujiie, Kohtaro.,...&Nielsen, Stefan.(2017).Past seismic slip-to-the-trench recorded in Central America megathrust.NATURE GEOSCIENCE,10(12). |
MLA | Vannucchi, Paola,et al."Past seismic slip-to-the-trench recorded in Central America megathrust".NATURE GEOSCIENCE 10.12(2017). |
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