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Depth estimation of pre-Kalahari basement in Southern Angola using seismic noise measurements and drill-hole data

2024-08Journal article Open access
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dc.contributor.authorCarvalho, João
dc.contributor.authorAlves, Daniela
dc.contributor.authorBorges, José Fernando
dc.contributor.authorCaldeira, Bento
dc.contributor.authorCordeiro, Domingos
dc.contributor.authorMachadinho, Ana
dc.contributor.authorOliveira, Álvaro
dc.contributor.authorRamalho, Elsa
dc.contributor.authorRodrigues, José Feliciano
dc.contributor.authorLlorente, J.
dc.contributor.authorDitutala, M.
dc.contributor.authorLobón, Jose Luis Garcia
dc.contributor.authorMáximo, J.
dc.contributor.authorCarvalho, Cristina Isabel Paulo
dc.contributor.authorLabaredas, José
dc.contributor.authorIbarra, P.
dc.contributor.authorManuel, José
dc.date.accessioned2024-11-13T16:35:37Z
dc.date.available2024-11-13T16:35:37Z
dc.date.issued2024-08
dc.description.abstractABSTRACT: The remote Southern region of Angola is covered by siliciclastic Kalahari Cenozoic formations that host underground aquifers of great importance to local populations affected by water scarcity problems. These aquifers are well developed where Kalahari sands reach appropriate thicknesses. On the other hand, at the eastern end of this area, regional aeromagnetic data recently acquired suggested the possibility of the continuity of the geological structures of the Lufilian Arc, sited in the nearby Zambia and Congo, southwestwards into Angola under the Kalahari formations. Once the Lufilian Arc is associated with the presence of the so-called Central African Copperbelt, this possibility increased the interest in determining the depth to Pan-African rocks under the Kalahari basin. To estimate the thickness of Kalahari formations in this area of difficult access and poor logistics, an expedited and non-invasive geophysical method was needed. Seismic noise and the single-station Nakamura technique were chosen, but due to the large distance of the study area from the ocean, one of the major sources of seismic noise, a test survey was acquired in the Cuvelai region to assess the signal quality, where the data was calibrated using available drill-holes. >170 points of seismic ambient noise were later acquired and the horizontal/vertical (HVSR) amplitude versus frequency curves were 1D inverted for the best velocity/density model for each station. The results were compared with 1D inverted legacy vertical electrical soundings reprocessed and validated in this work, showing similar depth-to-basement, while interpreted velocities/densities of geological formations were sampled and confirmed with measurements. A depth-to-basement map was produced using seismic information, mechanical soundings, and geological information. Despite the relatively reduced geographical area covered, the map presents valuable information for hydrogeology and mineral exploration purposes and agrees with a previously available coarser map of Kalahari thickness and with observations from geological surveys simultaneously conducted at the time of the seismic surveys.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCarvalho, J., Alves, D., Borges, J., Caldeira, B., Cordeiro, D., Machadinho, A., Oliveira, A., Ramalho, E.C., Rodrigues, J.F., Llorente, J.M., Ditutala, M., García-Lobón, J.L., Máximo, J., Carvalho, C., Labaredas, J., Ibarra, P. & Manuel, J. (2024) Depth estimation of pre-Kalahari basement in Southern Angola using seismic noise measurements and drill-hole data. In: Journal of Applied Geophysics, 2024, vol. 230, article nº 105498. https://doi.org/10.1016/j.jappgeo.2024.105498pt_PT
dc.identifier.doi10.1016/j.jappgeo.2024.105498pt_PT
dc.identifier.eissn1879-1859
dc.identifier.issn0926-9851
dc.identifier.urihttp://hdl.handle.net/10400.9/4383
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationGeosciences Center
dc.relationGeoBioSciences GeoTechnologies and GeoEngineering
dc.relationINSTITUTE OF EARTH SCIENCES
dc.relation.publisherversionhttps://doi.org/10.1016/j.jappgeo.2024.105498pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectGeophysicspt_PT
dc.subjectDrill-holespt_PT
dc.subjectSeismic surveypt_PT
dc.subjectGeological surveyspt_PT
dc.subjectHydrogeophysicspt_PT
dc.subjectKalahari basinpt_PT
dc.subjectAngola (Southern)pt_PT
dc.titleDepth estimation of pre-Kalahari basement in Southern Angola using seismic noise measurements and drill-hole datapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleGeosciences Center
oaire.awardTitleGeoBioSciences GeoTechnologies and GeoEngineering
oaire.awardTitleINSTITUTE OF EARTH SCIENCES
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00073%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04035%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04683%2F2020/PT
oaire.citation.titleJournal of Applied Geophysicspt_PT
oaire.citation.volume230pt_PT
oaire.fundingStream6817 - DCRRNI ID
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oaire.fundingStream6817 - DCRRNI ID
person.familyNameCarvalho
person.familyNameCaldeira
person.familyNameMachadinho
person.familyNameOliveira
person.familyNameRamalho
person.familyNameRodrigues
person.familyNameCarvalho
person.givenNameJoão
person.givenNameBento
person.givenNameAna
person.givenNameÁlvaro
person.givenNameElsa
person.givenNameJosé Feliciano
person.givenNameCristina Isabel Paulo
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person.identifier.ridM-6005-2013
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person.identifier.scopus-author-id56638554400
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
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