气候变化领域集成服务门户(CCPortal): Slab Dehydration in Sumatra: Implications for Fast and Slow Earthquakes and Arc Magmatism

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DOI	10.1029/2020GL090576
	Slab Dehydration in Sumatra: Implications for Fast and Slow Earthquakes and Arc Magmatism
	Ji, Yingfeng; Yan, Ruyu; Zeng, Deng; Xie, Chaodi; Zhu, Weiling; Qu, Rui; Yoshioka, Shoichi
通讯作者	Ji, YF (通讯作者)
发表日期	2021
ISSN	0094-8276
EISSN	1944-8007
卷号	48 期号:3
英文摘要	The catastrophic 2004 Sumatra-Andaman Mw9.1 earthquake associated with destructive tsunamis has characterized Sumatra as one of the most dangerous convergence zones. Nevertheless, the effects of the thermohydrous state on the strongly coupled megathrust of the incoming plate remain enigmatic. By using a three-dimensional (3-D) thermomechanical model to compute the temperature variation and the complicated phase transition process of the water-bearing descending plate which generates unstable thrust slips, we find that Sumatran earthquakes at varying depths are likely under the control of the inter or intraplate hydrothermal regime, which occurs in or close to the petrological metamorphism transition area. The slab dehydration of the water-rich mid-ocean-ridge basalts (MORB) and the ultramafic rocks in the oceanic lithosphere releases a large amount of fluid to the continental wedge and further facilitates arc magmatism. The fluids are prone to upwelling following the subduction channel along the plate interface and thus contribute to the clustering of earthquakes updip of the dehydration front beneath offshore Sumatra. Brittle failure and dehydration embrittlement at depth, along with the temperature differences caused by variant slab geometry, are conjectured to greatly influence the occurrence of fast and slow earthquakes in Sumatra.
英文关键词	earthquakes; numerical simulation; petrological metamorphism; slab dehydration; Sumatra subduction zone; thermal regime
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000620058900051
来源期刊	GEOPHYSICAL RESEARCH LETTERS
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/260328
推荐引用方式 GB/T 7714	Ji, Yingfeng,Yan, Ruyu,Zeng, Deng,et al. Slab Dehydration in Sumatra: Implications for Fast and Slow Earthquakes and Arc Magmatism[J]. 中国科学院青藏高原研究所,2021,48(3).
APA	Ji, Yingfeng.,Yan, Ruyu.,Zeng, Deng.,Xie, Chaodi.,Zhu, Weiling.,...&Yoshioka, Shoichi.(2021).Slab Dehydration in Sumatra: Implications for Fast and Slow Earthquakes and Arc Magmatism.GEOPHYSICAL RESEARCH LETTERS,48(3).
MLA	Ji, Yingfeng,et al."Slab Dehydration in Sumatra: Implications for Fast and Slow Earthquakes and Arc Magmatism".GEOPHYSICAL RESEARCH LETTERS 48.3(2021).