Moho determination from GOCE gradiometry data over Ethiopia

Gedamu, Andenet A.; Eshagh, Mehdi; Bedada, Tulu Besha

doi:10.1016/j.jafrearsci.2019.103741

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…Numerous geophysical techniques, such as receiver function analysis (Ahmed et al, 2013(Ahmed et al, , 2022Dugda et al, 2005;Ebinger et al, 2017;Hammond et al, 2011;Keranen et al, 2009;Kibret et al, 2019Kibret et al, , 2022Kibret et al, , 2023Lavayssière et al, 2018;Ogden et al, 2019Ogden et al, , 2023Stuart et al, 2006), inversion of seismic data including tomography (Alemayehu et al, 2023;Chambers et al, 2019;Eshetu et al, 2021;Kounoudis et al, 2023;Petruska & Eilon, 2022), controlled source seismic (Berckhemer et al, 1975;Maguire et al, 2006;Makris & Ginzburg, 1987) and gravity (Cornwell et al, 2006;Gedamu et al, 2020;Globig et al, 2016;Kassa et al, 2021;Lewi et al, 2016;Mahatsente et al, 1999;Mickus et al, 2007;Tedla et al, 2011;Tiberi et al, 2005;Woldetinsae & Götze, 2005), have been used to examine the crustal thickness in the region. According to these studies, crustal thickness varies substantially over the region, ranging from an average maximum depth of about 46 km beneath Northwestern Ethiopian Plateau (NWEP) to about 7 km in the GAR and even to less than 4 km in the RSR (e.g., Ahmed et al, 2013;Hammond et al, 2011;Keranen et al, 2009;Maguire et al, 2006).…”

Section: Crustal Structurementioning

confidence: 99%

Seamless Map of Depth to the Moho Interface in the Afro‐Arabian Region Using Gravity Data Derived From EGM2008

Lewi

2024

Geochem Geophys Geosyst

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The Afro‐Arabian region is one of the few places on land, where rifting processes at divergent plate boundaries can be thoroughly investigated. One of the crucial factors in understanding rifting processes involves assessing the crustal thickness. In this study, gravity data from the Earth Gravitational Model 2008 is used to create a seamless map of the depth to the Moho interface. Unlike many previous investigations that focused on specific localized areas, within the region, results from the current study provide a comprehensive view. The depth obtained from the current investigation aligns well with findings from earlier studies, exhibiting a bias of 0.69 km and a standard deviation of 3.89 km. Within the region, maximum and minimum depths to the Moho interface are observed beneath the northwest Ethiopian Plateau and the Gulf of Aden Rift (GAR), respectively. Analyzing profiles across the Red Sea, Main Ethiopian, and GARs, the study concluded that the Southern Main Ethiopian Rift is in an earlier stage of the rifting process, while the GAR is at an advanced stage. Furthermore, the interpretation of the current findings led to the inference that there might exist two potential plume tails driving the rifting process in the East Africa Rift—one originating from the Afar region and the other from South Kenya. This inference primarily relies on the isostatic compensation stages observed in the various rift systems throughout the region.

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Section: Crustal Structurementioning

confidence: 99%

Seamless Map of Depth to the Moho Interface in the Afro‐Arabian Region Using Gravity Data Derived From EGM2008

Lewi

2024

Geochem Geophys Geosyst

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“…For more than a decade, several methods for estimating Moho undulations using gravity disturbances have been revolutionized (Abrehdary et al., 2017; Abrehdary & Sjöberg, 2019, 2021; Ashagrie et al., 2020; Bagherbandi & Eshagh, 2012; Eshagh, 2014; Eshagh & Hussain, 2016). Among the inversion methods most used by the scientific community, we can include the VMM (Vening Meinesz–Moritz) method (Eshagh, 2016), the direct gravity inversion method (Chen & Tenzer, 2017a), and the Generalized Parker‐Oldenburg method (Chen & Tenzer, 2017b).…”

Section: Introductionmentioning

confidence: 99%

Moho Geometry Estimation Beneath the Gulf of Guinea From Satellite Gravity Data Based on a Regularized Non‐Linear Gravity Inversion

Kamto

Lemotio

Kamguia

2023

Earth and Space Science

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The Gulf of Guinea is a part of the Atlantic Ocean which sinks in a corner toward the center of Africa. It was formed following the separation between the African and South American plates. The Gulf of Guinea contains several geological structures with significant tectonic activities (earthquakes, volcanoes, and mountain building). One of its major geological structures is the Cameroon Volcanic Line in its southern part with several volcanoes, islands and seamounts. However, the continental margins of the Gulf of Guinea are very populated areas and can be considerably affected by tectonic and seismic activities coming from the oceanic domain (Shimazaki, 1976). Many earthquakes and volcanic eruptions have already affected several neighboring regions adjacent to the Gulf of Guinea, causing enormous material and human life losses (Amponsah, 2004;Yarwood & Doser, 1990). These tectonic and seismic activities coming from the oceanic crust could be strongly influenced by deep geodynamics (Sampietro, 2016). Estimating the geometry of the Moho (boundary between the Earth's crust and the uppermost mantle) could greatly contribute for understanding the seismic, tectonic and geodynamic phenomena that dominate the Gulf of Guinea. Also, a precise modeling of Moho undulations has never been the subject of a study at the scale of the Gulf of Guinea.Seismic data are mainly used to estimate the depth of the Moho beneath continental coastal regions and marginal seas. Although the accuracy and effectiveness of seismic tomographic images for geophysical exploration, many regions in the world are still uncovered by seismic data or sometimes, available data are very sparse. Because of this poor coverage of seismic data, global gravitational models can be a good alternative. With the advent of satellite gravity missions like CHAMP (CHAllenging Minisatellite Payload;Reigber et al., 2002), GRACE

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