Preliminary crustal structure of the coast of Guerrero, Mexico, using the minimum apparent velocity of refracted waves

The seismic velocity structure beneath the coast of Guerrero, Mexico was determined using the minimum apparent velocities of refracted waves. The data used in the analysis is a selection of local earthquakes recorded by the Guerrero Seismic Network installed at the end of 1987 to monitor the seismic...

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Detalles Bibliográficos
Autores: Suárez, Gerardo, Ligorría, Juan Pablo, Ponce, Lautaro
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:1992
País:México
Institución:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
Repositorio:Geofísica Internacional
Idioma:español
OAI Identifier:oai:revistagi.geofisica.unam.mx:article/1294
Acceso en línea:http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1294
Access Level:acceso abierto
Palabra clave:Guerrero
Subducción
Corteza
Estructura de velocidad
Subduction
Crust
Velocity structure
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spelling Preliminary crustal structure of the coast of Guerrero, Mexico, using the minimum apparent velocity of refracted wavesPreliminary crustal structure of the coast of Guerrero, Mexico, using the minimum apparent velocity of refracted wavesSuárez, GerardoLigorría, Juan PabloPonce, LautaroGuerreroSubducciónCortezaEstructura de velocidadGuerreroSubductionCrustVelocity structureThe seismic velocity structure beneath the coast of Guerrero, Mexico was determined using the minimum apparent velocities of refracted waves. The data used in the analysis is a selection of local earthquakes recorded by the Guerrero Seismic Network installed at the end of 1987 to monitor the seismicity of this seismic gap. The earthquakes were selected on the basis of the quality of their hypocentral location and to insure a homogeneous and complete sampling of the velocity structure of the study area. The results show that the crust in this subduction zone is composed of four layers with the following velocities and thicknesses: Vt=5.8, V2=6.5, V3=7.1 and V4=7.4 km/s; h1=10, h2=8.4 and h3=5.0 krn. No raypaths refracted from the Moho discontinuity were observed, although we included events far from the center of the network. The absence of a mantle refraction in this area may be interpreted as evidence that the lower crust of the overriding continental plate lies directly on top of the upper crust of the subducting Cocos plate without any intervening mantle layer. Detailed mapping of the megathrust seismic zone indicates that the approximate depth of the deepest crustal layer of the upper plate is similar to that of the interplate seismogenic contact.Se muestra la estructura de velocidades sísmicas en la costa de Guerrero, México, determinada a partir de las velocidades aparentes mínimas de ondas refractadas. Los datos utilizados en el análisis fueron ·registrados por la Red Telemétrica de Guerrero, instalada a fines de 1987 para monitorear la actividad de la brecha de Guerrero. Los sismos fueron Seleccionados con base en la calidad de su localizaci6n y para asegurar un muestreo homogéneo de la estructura de velocidad en la zona. Los resultados muestran que en la zona de subducci6n la corteza está compuesta de cuatro capas con las siguientes velocidades y espesores: Vt=5.8, V2=6.5, V3=7.1 y V4=7.4 km/s; ht=10, h2=8.4 y h3=5.0 km. No se observaron refracciones provenientes de la discontinuidad de Mohorovicic, a pesar de que se incluyeron eventos alejados del centro de la red. Esto sugiere que en la regi6n la corteza continental inferior descansa directamente sobre la placa de Cocos. Un mapeo detallado de la zona de contacto interplaca indica que esta se encuentra aproximadamente a la misma profundidad que el espesor total de la corteza continental.Universidad Nacional Autónoma de México. Instituto de Geofísica1992-07-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://revistagi.geofisica.unam.mx/index.php/RGI/article/view/129410.22201/igeof.00167169p.1992.31.3.1294Geofisica Internacional; Vol. 31 No. 3 (1992): July 1, 1992; 247-252Geofísica Internacional; Vol. 31 Núm. 3 (1992): Julio 1, 1992; 247-2522954-436X0016-716910.22201/igeof.00167169p.1992.31.3reponame:Geofísica Internacionalinstname:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICOinstacron:UNAMspahttp://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1294/1280https://creativecommons.org/licenses/by-nc-sa/4.0/info:eu-repo/semantics/openAccessoai:revistagi.geofisica.unam.mx:article/12942024-08-16T17:32:07Z
dc.title.none.fl_str_mv Preliminary crustal structure of the coast of Guerrero, Mexico, using the minimum apparent velocity of refracted waves
Preliminary crustal structure of the coast of Guerrero, Mexico, using the minimum apparent velocity of refracted waves
title Preliminary crustal structure of the coast of Guerrero, Mexico, using the minimum apparent velocity of refracted waves
spellingShingle Preliminary crustal structure of the coast of Guerrero, Mexico, using the minimum apparent velocity of refracted waves
Suárez, Gerardo
Guerrero
Subducción
Corteza
Estructura de velocidad
Guerrero
Subduction
Crust
Velocity structure
title_short Preliminary crustal structure of the coast of Guerrero, Mexico, using the minimum apparent velocity of refracted waves
title_full Preliminary crustal structure of the coast of Guerrero, Mexico, using the minimum apparent velocity of refracted waves
title_fullStr Preliminary crustal structure of the coast of Guerrero, Mexico, using the minimum apparent velocity of refracted waves
title_full_unstemmed Preliminary crustal structure of the coast of Guerrero, Mexico, using the minimum apparent velocity of refracted waves
title_sort Preliminary crustal structure of the coast of Guerrero, Mexico, using the minimum apparent velocity of refracted waves
dc.creator.none.fl_str_mv Suárez, Gerardo
Ligorría, Juan Pablo
Ponce, Lautaro
author Suárez, Gerardo
author_facet Suárez, Gerardo
Ligorría, Juan Pablo
Ponce, Lautaro
author_role author
author2 Ligorría, Juan Pablo
Ponce, Lautaro
author2_role author
author
dc.subject.none.fl_str_mv Guerrero
Subducción
Corteza
Estructura de velocidad
Guerrero
Subduction
Crust
Velocity structure
topic Guerrero
Subducción
Corteza
Estructura de velocidad
Guerrero
Subduction
Crust
Velocity structure
description The seismic velocity structure beneath the coast of Guerrero, Mexico was determined using the minimum apparent velocities of refracted waves. The data used in the analysis is a selection of local earthquakes recorded by the Guerrero Seismic Network installed at the end of 1987 to monitor the seismicity of this seismic gap. The earthquakes were selected on the basis of the quality of their hypocentral location and to insure a homogeneous and complete sampling of the velocity structure of the study area. The results show that the crust in this subduction zone is composed of four layers with the following velocities and thicknesses: Vt=5.8, V2=6.5, V3=7.1 and V4=7.4 km/s; h1=10, h2=8.4 and h3=5.0 krn. No raypaths refracted from the Moho discontinuity were observed, although we included events far from the center of the network. The absence of a mantle refraction in this area may be interpreted as evidence that the lower crust of the overriding continental plate lies directly on top of the upper crust of the subducting Cocos plate without any intervening mantle layer. Detailed mapping of the megathrust seismic zone indicates that the approximate depth of the deepest crustal layer of the upper plate is similar to that of the interplate seismogenic contact.
publishDate 1992
dc.date.none.fl_str_mv 1992-07-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1294
10.22201/igeof.00167169p.1992.31.3.1294
url http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1294
identifier_str_mv 10.22201/igeof.00167169p.1992.31.3.1294
dc.language.none.fl_str_mv spa
language spa
dc.relation.none.fl_str_mv http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1294/1280
dc.rights.none.fl_str_mv https://creativecommons.org/licenses/by-nc-sa/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidad Nacional Autónoma de México. Instituto de Geofísica
publisher.none.fl_str_mv Universidad Nacional Autónoma de México. Instituto de Geofísica
dc.source.none.fl_str_mv Geofisica Internacional; Vol. 31 No. 3 (1992): July 1, 1992; 247-252
Geofísica Internacional; Vol. 31 Núm. 3 (1992): Julio 1, 1992; 247-252
2954-436X
0016-7169
10.22201/igeof.00167169p.1992.31.3
reponame:Geofísica Internacional
instname:UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
instacron:UNAM
instname_str UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO
instacron_str UNAM
institution UNAM
reponame_str Geofísica Internacional
collection Geofísica Internacional
repository.name.fl_str_mv
repository.mail.fl_str_mv
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