Seismic refraction tomography in San Luis, headward Coca River erosion zone

In the context of the headward erosion of the Coca River, we have carried out a seismic tomography experiment in the San Luis town at the river bank. San Luis is located directly over the eroded debris avalanche, but this resists mass movement, probably due to the presence of volcanic breccia deposi...

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Autores: Araujo, Sebastián, Guzmán, Oswaldo, Guamán, Anderson, Espín, Ronny, García, Isabel, Chulde, Edgar
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:Ecuador
Recursos:Universidad Regional Amazónica
Repositorio:Repositorio Universidad Regional Amazónica
OAI Identifier:oai:repositorio.ikiam.edu.ec:RD_IKIAM/669
Acesso em linha:https://doi.org/10.1016/j.jappgeo.2023.104981
http://repositorio.ikiam.edu.ec/jspui/handle/RD_IKIAM/669
Access Level:acceso abierto
Palavra-chave:Seismic
tomography
Erosion
Coca River
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spelling Seismic refraction tomography in San Luis, headward Coca River erosion zoneAraujo, SebastiánGuzmán, OswaldoGuamán, AndersonEspín, RonnyGarcía, IsabelChulde, EdgarSeismictomographyErosionCoca RiverIn the context of the headward erosion of the Coca River, we have carried out a seismic tomography experiment in the San Luis town at the river bank. San Luis is located directly over the eroded debris avalanche, but this resists mass movement, probably due to the presence of volcanic breccia deposits. We have developed a procedure to attack seismic tomography’s regularization problem. This procedure consists in using regularization by smoothing. The smoothing parameter is chosen whit the L-curve criterion and gives the optimal solution. To draw the L-curve, we have varied the vertical and horizontal smoothing parameters and plotted the root mean square error of the model versus the three norms between the a priori and the resulting models. We have tested the Euclidean, taxicab, and infinity norms in our procedure to better detail the optimal solution. We have tested the regularization strategy in a synthetic model with a similar dimension to the problem in our survey. The results of tomography allow describing the geology strata structure below the village. Two stratigraphic units resulting from debris avalanche deposits are overlayed in a bedrock unit that seems to give structural strength to prevent river erosion in San Luis. We have identified this bedrock with the volcanic breccia at 20 m depth. The breccia P wave seismic velocity obtained with the tomography is 1.2 km/s. The parameters of velocity and structure resulting from our seismic survey allow a hazard diagnostic and future solutions for the San Luis settlement.Scopus2023-05-02T18:08:54Z2023-05-02T18:08:54Z2023info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfSebastián Araujo, Oswaldo Guzmán, Anderson Guamán, Ronny Espín, Isabel García, Edgar Chulde, Seismic refraction tomography in San Luis, headward Coca River erosion zone, Journal of Applied Geophysics, Volume 212, 2023, 104981, ISSN 0926-9851, https://doi.org/10.1016/j.jappgeo.2023.104981. (https://www.sciencedirect.com/science/article/pii/S0926985123000587)https://doi.org/10.1016/j.jappgeo.2023.104981http://repositorio.ikiam.edu.ec/jspui/handle/RD_IKIAM/669enPRODUCCIÓN CIENTÍFICA-ARTÍCULO CIENTÍFICO;A-IKIAM-000459info:eu-repo/semantics/openAccessreponame:Repositorio Universidad Regional Amazónicainstname:Universidad Regional Amazónicainstacron:IKIAM2023-05-03T08:00:22Zoai:repositorio.ikiam.edu.ec:RD_IKIAM/669Institucionalhttps://repositorio.ikiam.edu.ec/Universidad públicahttps://www.ikiam.edu.ec/https://repositorio.ikiam.edu.ec/oaiEcuador...opendoar:02023-05-03T08:00:22falseInstitucionalhttps://repositorio.ikiam.edu.ec/Universidad públicahttps://www.ikiam.edu.ec/https://repositorio.ikiam.edu.ec/oai.Ecuador...opendoar:02023-05-03T08:00:22Repositorio Universidad Regional Amazónica - Universidad Regional Amazónicafalse
dc.title.none.fl_str_mv Seismic refraction tomography in San Luis, headward Coca River erosion zone
title Seismic refraction tomography in San Luis, headward Coca River erosion zone
spellingShingle Seismic refraction tomography in San Luis, headward Coca River erosion zone
Araujo, Sebastián
Seismic
tomography
Erosion
Coca River
title_short Seismic refraction tomography in San Luis, headward Coca River erosion zone
title_full Seismic refraction tomography in San Luis, headward Coca River erosion zone
title_fullStr Seismic refraction tomography in San Luis, headward Coca River erosion zone
title_full_unstemmed Seismic refraction tomography in San Luis, headward Coca River erosion zone
title_sort Seismic refraction tomography in San Luis, headward Coca River erosion zone
dc.creator.none.fl_str_mv Araujo, Sebastián
Guzmán, Oswaldo
Guamán, Anderson
Espín, Ronny
García, Isabel
Chulde, Edgar
author Araujo, Sebastián
author_facet Araujo, Sebastián
Guzmán, Oswaldo
Guamán, Anderson
Espín, Ronny
García, Isabel
Chulde, Edgar
author_role author
author2 Guzmán, Oswaldo
Guamán, Anderson
Espín, Ronny
García, Isabel
Chulde, Edgar
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv Seismic
tomography
Erosion
Coca River
topic Seismic
tomography
Erosion
Coca River
description In the context of the headward erosion of the Coca River, we have carried out a seismic tomography experiment in the San Luis town at the river bank. San Luis is located directly over the eroded debris avalanche, but this resists mass movement, probably due to the presence of volcanic breccia deposits. We have developed a procedure to attack seismic tomography’s regularization problem. This procedure consists in using regularization by smoothing. The smoothing parameter is chosen whit the L-curve criterion and gives the optimal solution. To draw the L-curve, we have varied the vertical and horizontal smoothing parameters and plotted the root mean square error of the model versus the three norms between the a priori and the resulting models. We have tested the Euclidean, taxicab, and infinity norms in our procedure to better detail the optimal solution. We have tested the regularization strategy in a synthetic model with a similar dimension to the problem in our survey. The results of tomography allow describing the geology strata structure below the village. Two stratigraphic units resulting from debris avalanche deposits are overlayed in a bedrock unit that seems to give structural strength to prevent river erosion in San Luis. We have identified this bedrock with the volcanic breccia at 20 m depth. The breccia P wave seismic velocity obtained with the tomography is 1.2 km/s. The parameters of velocity and structure resulting from our seismic survey allow a hazard diagnostic and future solutions for the San Luis settlement.
publishDate 2023
dc.date.none.fl_str_mv 2023-05-02T18:08:54Z
2023-05-02T18:08:54Z
2023
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv Sebastián Araujo, Oswaldo Guzmán, Anderson Guamán, Ronny Espín, Isabel García, Edgar Chulde, Seismic refraction tomography in San Luis, headward Coca River erosion zone, Journal of Applied Geophysics, Volume 212, 2023, 104981, ISSN 0926-9851, https://doi.org/10.1016/j.jappgeo.2023.104981. (https://www.sciencedirect.com/science/article/pii/S0926985123000587)
https://doi.org/10.1016/j.jappgeo.2023.104981
http://repositorio.ikiam.edu.ec/jspui/handle/RD_IKIAM/669
identifier_str_mv Sebastián Araujo, Oswaldo Guzmán, Anderson Guamán, Ronny Espín, Isabel García, Edgar Chulde, Seismic refraction tomography in San Luis, headward Coca River erosion zone, Journal of Applied Geophysics, Volume 212, 2023, 104981, ISSN 0926-9851, https://doi.org/10.1016/j.jappgeo.2023.104981. (https://www.sciencedirect.com/science/article/pii/S0926985123000587)
url https://doi.org/10.1016/j.jappgeo.2023.104981
http://repositorio.ikiam.edu.ec/jspui/handle/RD_IKIAM/669
dc.language.none.fl_str_mv en
language_invalid_str_mv en
dc.relation.none.fl_str_mv PRODUCCIÓN CIENTÍFICA-ARTÍCULO CIENTÍFICO;A-IKIAM-000459
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Scopus
publisher.none.fl_str_mv Scopus
dc.source.none.fl_str_mv reponame:Repositorio Universidad Regional Amazónica
instname:Universidad Regional Amazónica
instacron:IKIAM
instname_str Universidad Regional Amazónica
instacron_str IKIAM
institution IKIAM
reponame_str Repositorio Universidad Regional Amazónica
collection Repositorio Universidad Regional Amazónica
repository.name.fl_str_mv Repositorio Universidad Regional Amazónica - Universidad Regional Amazónica
repository.mail.fl_str_mv .
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