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

doi:10.1785/0220190356

CORC > 海洋研究所 > 中国科学院海洋研究所 > 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 4; Wu, Shiguo 3; Li, Tongfei 2
刊名	SEISMOLOGICAL RESEARCH LETTERS
	2020-05-01
卷号	91 期号:3 页码:1679-1693
ISSN号	0895-0695
DOI	10.1785/0220190356
通讯作者	Bai, Yongliang(yongliang.bai1986@gmail.com)
英文摘要	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.
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
语种	英语
出版者	SEISMOLOGICAL SOC AMER
WOS记录号	WOS:000530707300034
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/167427]
专题	海洋研究所_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.Wuhan Ctr Geol Survey CGS, Wuhan, Peoples R China 3.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, 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.