Spatiotemporal Seismotectonic Implications for the Izu-Bonin-Mariana Subduction Zone from b-Values

doi:10.1785/0220190356

IOCAS-IR > 海洋地质与环境重点实验室

	Spatiotemporal Seismotectonic Implications for the Izu-Bonin-Mariana Subduction Zone from b-Values
	Gui, Zhou 1; Bai, Yongliang 1; Wang, Zhenjie 1; Dong, Dongdong 2; Wu, Shiguo 3; Li, Tongfei 4
	2020-05-01
发表期刊	SEISMOLOGICAL RESEARCH LETTERS
ISSN	0895-0695
卷号	91 期号:3 页码:1679-1693
通讯作者	Bai, Yongliang(yongliang.bai1986@gmail.com)
摘要	Studies on the physical properties of the entire Izu-Bonin-Mariana (IBM) subduction zone contribute to comprehensive seismotectonic understanding and earthquake potential assessment, especially given previous controversial conclusions. Determining seismic bvalue is a method that has been used for other regions and is adopted here to study the spatiotemporal variations along the IBM system. Based on the frequency-magnitude distribution relation log(10) (N) = a-bM, b-values are mapped within the subduction zone using earthquakes with M-w >= 2 after 2005. The b-value anomalies in cross sections indicate detailed seismotectonic characteristics against the regional geological background. The common characteristics from north to south: (1) regional high b-values at shallow depths in the overriding are associated with relatively low temperatures in thermal model, the bottom half of which correspond with highly serpentinized mantle wedge; and (2) low b-values at intermediate depths are associated with high temperatures along the primarily heated hydrated slab. In the Izu-Bonin segment, low b-values around the slab deflection at deep depths respond to stress buildup and shearing instability of meta-stable olivine in primarily heated hydrated slabs. In the Mariana segment, high b-values beneath the volcanic region at depths from the surface to 50 km and between 50 and 100 km are associated with extension and volcanism and the melting region, respectively. Temporal b-value variations indicate regional changes before and after large events for further seismic risk analysis. Stress drops of large intermediate and deep earthquakes are negligible to local stress state in strong flexure of the incoming slab. The rupture zone around the Pagan region at an approximate depth of 200 km and the region around the rifting-spreading transition in the northern Mariana trough at depths between 180 and 350 km are areas for potential large earthquakes.
DOI	10.1785/0220190356
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[U1701245] ; Fundamental Research Funds for the Central Universities of China[18CX02064A] ; Open Fund of the State Key Laboratory of Earthquake Dynamics[LED2019B01] ; Qingdao National Laboratory for Marine Science and Technology Foundation[QNLM2016ORP0401]
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000530707300034
出版者	SEISMOLOGICAL SOC AMER
引用统计
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/167428
专题	海洋地质与环境重点实验室
通讯作者	Bai, Yongliang
作者单位	1.China Univ Petr East China, Coll Oceanog & Space Informat, Qingdao, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China 3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China 4.Wuhan Ctr Geol Survey CGS, Wuhan, Peoples R China
推荐引用方式 GB/T 7714	Gui, Zhou,Bai, Yongliang,Wang, Zhenjie,et al. Spatiotemporal Seismotectonic Implications for the Izu-Bonin-Mariana Subduction Zone from b-Values[J]. SEISMOLOGICAL RESEARCH LETTERS,2020,91(3):1679-1693.
APA	Gui, Zhou,Bai, Yongliang,Wang, Zhenjie,Dong, Dongdong,Wu, Shiguo,&Li, Tongfei.(2020).Spatiotemporal Seismotectonic Implications for the Izu-Bonin-Mariana Subduction Zone from b-Values.SEISMOLOGICAL RESEARCH LETTERS,91(3),1679-1693.
MLA	Gui, Zhou,et al."Spatiotemporal Seismotectonic Implications for the Izu-Bonin-Mariana Subduction Zone from b-Values".SEISMOLOGICAL RESEARCH LETTERS 91.3(2020):1679-1693.

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