Application of a heuristic method for the estimation of s-wave velocity structure

The assessment of local site effects is one of the most important subjects in Engineering Seismology. In order to perform an assessment, it is necessary to determine the S-wave velocity structure of the site. Additionally, in some basins, it is very important to know the deep sedimentary structure,...

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Autores:
Alfaro Castillo, Andrés José
Tipo de recurso:
Article of journal
Fecha de publicación:
2006
Institución:
Universidad Nacional de Colombia
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Universidad Nacional de Colombia
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spa
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oai:repositorio.unal.edu.co:unal/34034
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https://repositorio.unal.edu.co/handle/unal/34034
http://bdigital.unal.edu.co/24114/
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Atribución-NoComercial 4.0 Internacional
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spelling Atribución-NoComercial 4.0 InternacionalDerechos reservados - Universidad Nacional de Colombiahttp://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Alfaro Castillo, Andrés Joséca3e4a53-a65e-466d-93a9-cb5898b1d6a13002019-06-27T23:10:35Z2019-06-27T23:10:35Z2006https://repositorio.unal.edu.co/handle/unal/34034http://bdigital.unal.edu.co/24114/The assessment of local site effects is one of the most important subjects in Engineering Seismology. In order to perform an assessment, it is necessary to determine the S-wave velocity structure of the site. Additionally, in some basins, it is very important to know the deep sedimentary structure, due to the amplification phenomena of low frequency waves. There are several techniques to achieve this purpose; probably the most inexpensive technique is using the vertical component of microtremors measured with an array of seismographs. The phase velocity of Rayleigh waves is inverted to an S-wave velocity (Vs) profile  using optimization techniques. Most of the time, least square methods have been applied in the inversion.Recently, heuristic methods have also been used for the estimation of the S-wave velocity structure from microtremor.In this study seven arrays of microtremors in the city of Tsukuba city were performed, located to the NE edge of Kanto Basin, in order to estimate the deep S-wave velocity structure. The spatial autocorrelationmethod SPAC was used to determine phase velocity dispersion curves in the frequency range from 0.3-2.5 Hz. The determination of Vs profiles reached a depth of 750 m. Two methods were used to estimate the Swavevelocity structure: Inversion method and a heuristic method via the combination of Downhill Simplex Algorithm with a Very Fast Simulated Annealing Method. Comparisons with Vs from the existent resultsfrom PS-logging tests at the center of the array showed the reliability of the heuristic method.application/pdfspaUNIVERSIDAD NACIONAL DE COLOMBIAhttp://revistas.unal.edu.co/index.php/esrj/article/view/21229Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research JournalEarth Sciences Research JournalEarth Sciences Research Journal; Vol. 10, núm. 1 (2006); 41-51 Earth Sciences Research Journal; Vol. 10, núm. 1 (2006); 41-51 2339-3459 1794-6190Alfaro Castillo, Andrés José (2006) Application of a heuristic method for the estimation of s-wave velocity structure. Earth Sciences Research Journal; Vol. 10, núm. 1 (2006); 41-51 Earth Sciences Research Journal; Vol. 10, núm. 1 (2006); 41-51 2339-3459 1794-6190 .Application of a heuristic method for the estimation of s-wave velocity structureArtículo de revistainfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501http://purl.org/coar/resource_type/c_2df8fbb1http://purl.org/coar/version/c_970fb48d4fbd8a85Texthttp://purl.org/redcol/resource_type/ARTORIGINAL21229-72100-1-PB.pdfapplication/pdf12754994https://repositorio.unal.edu.co/bitstream/unal/34034/1/21229-72100-1-PB.pdfd0dd5c194989147b44a2ba2fbb3f5982MD51THUMBNAIL21229-72100-1-PB.pdf.jpg21229-72100-1-PB.pdf.jpgGenerated Thumbnailimage/jpeg7599https://repositorio.unal.edu.co/bitstream/unal/34034/2/21229-72100-1-PB.pdf.jpg91e3895d8ea55f641ae604e8d4235cf9MD52unal/34034oai:repositorio.unal.edu.co:unal/340342022-12-29 23:03:17.564Repositorio Institucional Universidad Nacional de Colombiarepositorio_nal@unal.edu.co
dc.title.spa.fl_str_mv Application of a heuristic method for the estimation of s-wave velocity structure
title Application of a heuristic method for the estimation of s-wave velocity structure
spellingShingle Application of a heuristic method for the estimation of s-wave velocity structure
title_short Application of a heuristic method for the estimation of s-wave velocity structure
title_full Application of a heuristic method for the estimation of s-wave velocity structure
title_fullStr Application of a heuristic method for the estimation of s-wave velocity structure
title_full_unstemmed Application of a heuristic method for the estimation of s-wave velocity structure
title_sort Application of a heuristic method for the estimation of s-wave velocity structure
dc.creator.fl_str_mv Alfaro Castillo, Andrés José
dc.contributor.author.spa.fl_str_mv Alfaro Castillo, Andrés José
description The assessment of local site effects is one of the most important subjects in Engineering Seismology. In order to perform an assessment, it is necessary to determine the S-wave velocity structure of the site. Additionally, in some basins, it is very important to know the deep sedimentary structure, due to the amplification phenomena of low frequency waves. There are several techniques to achieve this purpose; probably the most inexpensive technique is using the vertical component of microtremors measured with an array of seismographs. The phase velocity of Rayleigh waves is inverted to an S-wave velocity (Vs) profile  using optimization techniques. Most of the time, least square methods have been applied in the inversion.Recently, heuristic methods have also been used for the estimation of the S-wave velocity structure from microtremor.In this study seven arrays of microtremors in the city of Tsukuba city were performed, located to the NE edge of Kanto Basin, in order to estimate the deep S-wave velocity structure. The spatial autocorrelationmethod SPAC was used to determine phase velocity dispersion curves in the frequency range from 0.3-2.5 Hz. The determination of Vs profiles reached a depth of 750 m. Two methods were used to estimate the Swavevelocity structure: Inversion method and a heuristic method via the combination of Downhill Simplex Algorithm with a Very Fast Simulated Annealing Method. Comparisons with Vs from the existent resultsfrom PS-logging tests at the center of the array showed the reliability of the heuristic method.
publishDate 2006
dc.date.issued.spa.fl_str_mv 2006
dc.date.accessioned.spa.fl_str_mv 2019-06-27T23:10:35Z
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dc.relation.ispartof.spa.fl_str_mv Universidad Nacional de Colombia Revistas electrónicas UN Earth Sciences Research Journal
Earth Sciences Research Journal
dc.relation.ispartofseries.none.fl_str_mv Earth Sciences Research Journal; Vol. 10, núm. 1 (2006); 41-51 Earth Sciences Research Journal; Vol. 10, núm. 1 (2006); 41-51 2339-3459 1794-6190
dc.relation.references.spa.fl_str_mv Alfaro Castillo, Andrés José (2006) Application of a heuristic method for the estimation of s-wave velocity structure. Earth Sciences Research Journal; Vol. 10, núm. 1 (2006); 41-51 Earth Sciences Research Journal; Vol. 10, núm. 1 (2006); 41-51 2339-3459 1794-6190 .
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