气候变化领域集成服务门户(CCPortal): Crustal and Upper Mantle Shear Wave Velocity Structure of Botswana: The 3 April 2017 Central Botswana Earthquake Linked to the East African Rift System

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DOI	10.1029/2019GL085598
	Crustal and Upper Mantle Shear Wave Velocity Structure of Botswana: The 3 April 2017 Central Botswana Earthquake Linked to the East African Rift System
	Fadel I.; Paulssen H.; van der Meijde M.; Kwadiba M.; Ntibinyane O.; Nyblade A.; Durrheim R.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:4
英文摘要	Rayleigh wave group and phase velocity measurements obtained from ambient noise and earthquake data at 51 broadband stations were used to construct the first 3-D crustal and upper mantle shear wave velocity model of Botswana. The model shows low crustal velocities associated with the Passarge and Nosop sedimentary basins, whereas the Kaapvaal, Zimbabwe, Maltahohe, and Congo Cratons are recognized by high mantle velocities. The lowest upper mantle shear wave velocity, beneath northeastern Botswana, is associated with the southwestern branch of the East African Rift System. This low-velocity mantle anomaly appears to be linked to the crust of the Okavango Rift Zone and the location of the 3 April 2017 Mw 6.5 earthquake in central Botswana. We suggest that fluids or melt at the base of the crust from the southward continuation of the East African Rift Zone triggered the intraplate earthquake in an extensional tectonic setting. © 2020. The Authors.
英文关键词	Acoustic noise; Acoustic wave velocity; Earthquakes; Geologic models; Seismology; Shear waves; Structural geology; Surface waves; Wave propagation; Ambient noise; Continental rift; craton; Extensional tectonics; Intraplate earthquakes; Shear wave velocity models; Shear wave velocity structure; Surface-wave tomography; Shear flow; ambient noise; craton; earthquake event; phase velocity; Rayleigh wave; S-wave; seismology; spatiotemporal analysis; upper mantle; wave group; Botswana; Congo; East African Rift; East African Rift; Okavango Rift Zone; Zimbabwe
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170660
作者单位	Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente, Enschede, Netherlands; Geology Department, Faculty of Science, Helwan University, Cairo, Egypt; Department of Earth Sciences, Utrecht University, Utrecht, Netherlands; Botswana Geoscience Institute, Lobatse, Botswana; Department of Geosciences, Pennsylvania State University, University Park, PA, United States; School of Geosciences, The University of the Witwatersrand, Johannesburg, South Africa
推荐引用方式 GB/T 7714	Fadel I.,Paulssen H.,van der Meijde M.,et al. Crustal and Upper Mantle Shear Wave Velocity Structure of Botswana: The 3 April 2017 Central Botswana Earthquake Linked to the East African Rift System[J],2020,47(4).
APA	Fadel I..,Paulssen H..,van der Meijde M..,Kwadiba M..,Ntibinyane O..,...&Durrheim R..(2020).Crustal and Upper Mantle Shear Wave Velocity Structure of Botswana: The 3 April 2017 Central Botswana Earthquake Linked to the East African Rift System.Geophysical Research Letters,47(4).
MLA	Fadel I.,et al."Crustal and Upper Mantle Shear Wave Velocity Structure of Botswana: The 3 April 2017 Central Botswana Earthquake Linked to the East African Rift System".Geophysical Research Letters 47.4(2020).