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| DOI | 10.1016/j.tecto.2020.228479 |
| Gravity derived crustal thickness model of Botswana: Its implication for the Mw 6.5 April 3, 2017, Botswana earthquake | |
| Chisenga C.; Van der Meijde M.; Yan J.; Fadel I.; Atekwana E.A.; Steffen R.; Ramotoroko C. | |
| 发表日期 | 2020 |
| ISSN | 00401951 |
| 卷号 | 787 |
| 英文摘要 | Botswana experienced a Mw 6.5 earthquake on 3rd April 2017, the second largest earthquake event in Botswana's recorded history. This earthquake occurred within the Limpopo-Shashe Belt, ~350 km southeast of the seismically active Okavango Rift Zone. The region has no historical record of large magnitude earthquakes or active faults. The occurrence of this earthquake was unexpected and underscores our limited understanding of the crustal configuration of Botswana and highlight that neotectonic activity is not only confined to the Okavango Rift Zone. To address this knowledge gap, we applied a regularized inversion algorithm to the Bouguer gravity data to construct a high-resolution crustal thickness map of Botswana. The produced crustal thickness map shows a thinner crust (35–40 km) underlying the Okavango Rift Zone and sedimentary basins, whereas thicker crust (41–46 km) underlies the cratonic regions and orogenic belts. Our results also show localized zone of relatively thinner crust (~40 km), one of which is located along the edge of the Kaapvaal Craton within the MW 6.5 Botswana earthquake region. Based on our result, we propose a mechanism of the Botswana Earthquake that integrates crustal thickness information with elevated heat flow as the result of the thermal fluid from East African Rift System, and extensional forces predicted by the local stress regime. The epicentral region is therefore suggested to be a possible area of tectonic reactivation, which is caused by multiple factors that could lead to future intraplate earthquakes in this region. © 2020 Elsevier B.V. |
| 关键词 | BotswanaCrustal thicknessGravity inversionIntraplate earthquakeMoiyabana Epicentral Region |
| 英文关键词 | Faulting; Structural geology; Bouguer gravity datum; Crustal thickness; Earthquake events; Epicentral region; Historical records; Intraplate earthquakes; Inversion algorithm; Tectonic reactivation; Earthquakes; algorithm; Bouguer anomaly; crustal thickness; data inversion; earthquake epicenter; earthquake event; gravity survey; intraplate process; neotectonics; rift zone; sedimentary basin; tectonic setting; Botswana; Okavango Rift Zone; Calluna vulgaris |
| 语种 | 英语 |
| 来源期刊 | Tectonophysics
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/207732 |
| 作者单位 | State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing (LIESMARS), Wuhan University, Box 129, Luoyu Road, Wuhan, China; Department of Earth Sciences, Ndata School of Climate and Earth Sciences, Malawi University of Science and Technology, P.O. Box 5196, Limbe, Malawi; University of Twente, Faculty for Geo-information Science and Earth Observation (ITC), P.O. Box 6, Enschede, AA 7500, Netherlands; Department of Earth Sciences, College of Earth, Ocean, and Environment, University of Delaware, Newark, Delaware, 19716, United States; Lantmäteriet, Lantmäterigatan 2C, Gävle, 80182, Sweden; Department of Physics and Astronomy, Botswana International University of Science and Technology, Palapye, Botswana |
| 推荐引用方式 GB/T 7714 | Chisenga C.,Van der Meijde M.,Yan J.,et al. Gravity derived crustal thickness model of Botswana: Its implication for the Mw 6.5 April 3, 2017, Botswana earthquake[J],2020,787. |
| APA | Chisenga C..,Van der Meijde M..,Yan J..,Fadel I..,Atekwana E.A..,...&Ramotoroko C..(2020).Gravity derived crustal thickness model of Botswana: Its implication for the Mw 6.5 April 3, 2017, Botswana earthquake.Tectonophysics,787. |
| MLA | Chisenga C.,et al."Gravity derived crustal thickness model of Botswana: Its implication for the Mw 6.5 April 3, 2017, Botswana earthquake".Tectonophysics 787(2020). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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