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DOI | 10.1002/2017GL074826 |
Thermal State, Slab Metamorphism, and Interface Seismicity in the Cascadia Subduction Zone Based On 3-D Modeling | |
Ji, Yingfeng1; Yoshioka, Shoichi1,2; Banay, Yuval A.2 | |
2017-09-28 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:18 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan |
英文摘要 | Giant earthquakes have repeatedly ruptured the Cascadia subduction zone, and similar earthquakes will likely also occur there in the near future. We employ a 3-D time-dependent thermomechanical model that incorporates an up-to-date description of the slab geometry to study the Cascadia subduction thrust. Results show a distinct band of 3-D slab dehydration that extends from Vancouver Island to the Seattle Basin and farther southward to the Klamath Mountains in northern California, where episodic tremors cluster. This distribution appears to include a region of increased dehydration in northern Cascadia. The phenomenon of heterogeneous megathrust seismicity associated with oblique subduction suggests that the presence of fluid-rich interfaces generated by slab dehydration favors megathrust seismogenesis in the northern part of this zone. The thin, relatively weakly metamorphosed Explorer, Juan de Fuca, and Gorda Plates are associated with an anomalous lack of thrust earthquakes, and metamorphism that occurs at temperatures of 500-700 degrees C near the Moho discontinuity may represent a key factor in explaining the presence of the associated episodic tremor and slip (ETS), which requires a young oceanic plate to subduct at a small dip angle, as is the case in Cascadia and southwestern Japan. The 3-D intraslab dehydration distribution suggests that the metamorphosed plate environment is more complex than had previously been believed, despite the existence of channeling vein networks. Slab amphibolization and eclogitization near the continental Moho depth is thus inferred to account for the resultant overpressurization at the interface, facilitating the generation of ETS and the occurrence of small to medium thrust earthquakes beneath Cascadia. |
英文关键词 | Cascadia thermal regime slab dehydration 3-D model |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413148100016 |
WOS关键词 | FORE-ARC MANTLE ; SEISMOGENIC ZONE ; EPISODIC TREMOR ; EARTHQUAKE ; BENEATH ; RUPTURE ; MARGIN ; JAPAN ; DEHYDRATION ; MAGNITUDE |
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/25870 |
专题 | 气候变化 |
作者单位 | 1.Kobe Univ, Res Ctr Urban Safety & Secur, Kobe, Hyogo, Japan; 2.Kobe Univ, Grad Sch Sci, Dept Planetol, Kobe, Hyogo, Japan |
推荐引用方式 GB/T 7714 | Ji, Yingfeng,Yoshioka, Shoichi,Banay, Yuval A.. Thermal State, Slab Metamorphism, and Interface Seismicity in the Cascadia Subduction Zone Based On 3-D Modeling[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(18). |
APA | Ji, Yingfeng,Yoshioka, Shoichi,&Banay, Yuval A..(2017).Thermal State, Slab Metamorphism, and Interface Seismicity in the Cascadia Subduction Zone Based On 3-D Modeling.GEOPHYSICAL RESEARCH LETTERS,44(18). |
MLA | Ji, Yingfeng,et al."Thermal State, Slab Metamorphism, and Interface Seismicity in the Cascadia Subduction Zone Based On 3-D Modeling".GEOPHYSICAL RESEARCH LETTERS 44.18(2017). |
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