Crustal structure of Mexico and surrounding regions from seismic ambient noise tomography

Using continuous seismic data from newly available broadband stations in Mexico and Central America we have obtained group and phase velocity maps of fundamental mode Rayleigh wave for the region. These new maps have been calculated for periods between 8 and 60 s from cross-correlations of seismic a...

Full description

Bibliographic Details
Authors: Gaite, Beatriz, Iglesias, Arturo, Villaseñor, Antonio, Herraiz Sarachaga, Miguel, Pacheco, Javier F.
Format: article
Publication Date:2012
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/75916
Online Access:http://hdl.handle.net/10261/75916
Access Level:Open access
Keyword:Tomography
Surface waves and free oscillations
Seismic tomography
North America
id ES_3ade1dce9cd2d8bd4700a689ef9e4f01
oai_identifier_str oai:digital.csic.es:10261/75916
network_acronym_str ES
network_name_str España
repository_id_str
spelling Crustal structure of Mexico and surrounding regions from seismic ambient noise tomographyGaite, BeatrizIglesias, ArturoVillaseñor, AntonioHerraiz Sarachaga, MiguelPacheco, Javier F.TomographySurface waves and free oscillationsSeismic tomographyNorth AmericaUsing continuous seismic data from newly available broadband stations in Mexico and Central America we have obtained group and phase velocity maps of fundamental mode Rayleigh wave for the region. These new maps have been calculated for periods between 8 and 60 s from cross-correlations of seismic ambient noise between 100 broadband stations, and stacked for 30 months from 2006 to 2008. The tomographic inversion of the obtained dispersion measurements has been carried out on a 1°× 1° grid, resulting in maps with resolution better than 250 km in the well-sampled regions of the model. For short periods (8-16 s) dispersion maps show good correlation with surface structural features. Low-velocity anomalies correlate with sedimentary basins around the Gulf of Mexico and Colorado embayment. High-velocity anomalies at short periods correlate with mountain ranges and regions of thin, extended crust such as the Gulf of California. Both the lowest and highest group velocity anomalies at these periods reach values of up to 15 per cent. For periods between 25 and 40 s, velocity anomalies are related to variations in crustal thickness and temperature. The most prominent low velocity anomaly correlates with thick crust and high mantle temperatures associated with the Trans-Mexican Volcanic Belt and the Central American volcanic arc. The most remarkable features for longer periods (40-60 s) are the differences between high-velocity anomalies beneath the Mayan block, the Gulf of Mexico and the cratonic part of the United States and low-velocity anomalies beneath the Chortis block and northern Mexico. The long wavelength features of our model agree well with previous global and continental scale studies. However, because of the increased station density of the data set used, we are able to obtain reliable dispersion maps for shorter periods, and to image smaller scale features.Peer reviewedRoyal Astronomical Society201320132012info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/75916reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1111/j.1365-246X.2011.05339.xinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/759162026-05-22T06:33:51Z
dc.title.none.fl_str_mv Crustal structure of Mexico and surrounding regions from seismic ambient noise tomography
title Crustal structure of Mexico and surrounding regions from seismic ambient noise tomography
spellingShingle Crustal structure of Mexico and surrounding regions from seismic ambient noise tomography
Gaite, Beatriz
Tomography
Surface waves and free oscillations
Seismic tomography
North America
title_short Crustal structure of Mexico and surrounding regions from seismic ambient noise tomography
title_full Crustal structure of Mexico and surrounding regions from seismic ambient noise tomography
title_fullStr Crustal structure of Mexico and surrounding regions from seismic ambient noise tomography
title_full_unstemmed Crustal structure of Mexico and surrounding regions from seismic ambient noise tomography
title_sort Crustal structure of Mexico and surrounding regions from seismic ambient noise tomography
dc.creator.none.fl_str_mv Gaite, Beatriz
Iglesias, Arturo
Villaseñor, Antonio
Herraiz Sarachaga, Miguel
Pacheco, Javier F.
author Gaite, Beatriz
author_facet Gaite, Beatriz
Iglesias, Arturo
Villaseñor, Antonio
Herraiz Sarachaga, Miguel
Pacheco, Javier F.
author_role author
author2 Iglesias, Arturo
Villaseñor, Antonio
Herraiz Sarachaga, Miguel
Pacheco, Javier F.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Tomography
Surface waves and free oscillations
Seismic tomography
North America
topic Tomography
Surface waves and free oscillations
Seismic tomography
North America
description Using continuous seismic data from newly available broadband stations in Mexico and Central America we have obtained group and phase velocity maps of fundamental mode Rayleigh wave for the region. These new maps have been calculated for periods between 8 and 60 s from cross-correlations of seismic ambient noise between 100 broadband stations, and stacked for 30 months from 2006 to 2008. The tomographic inversion of the obtained dispersion measurements has been carried out on a 1°× 1° grid, resulting in maps with resolution better than 250 km in the well-sampled regions of the model. For short periods (8-16 s) dispersion maps show good correlation with surface structural features. Low-velocity anomalies correlate with sedimentary basins around the Gulf of Mexico and Colorado embayment. High-velocity anomalies at short periods correlate with mountain ranges and regions of thin, extended crust such as the Gulf of California. Both the lowest and highest group velocity anomalies at these periods reach values of up to 15 per cent. For periods between 25 and 40 s, velocity anomalies are related to variations in crustal thickness and temperature. The most prominent low velocity anomaly correlates with thick crust and high mantle temperatures associated with the Trans-Mexican Volcanic Belt and the Central American volcanic arc. The most remarkable features for longer periods (40-60 s) are the differences between high-velocity anomalies beneath the Mayan block, the Gulf of Mexico and the cratonic part of the United States and low-velocity anomalies beneath the Chortis block and northern Mexico. The long wavelength features of our model agree well with previous global and continental scale studies. However, because of the increased station density of the data set used, we are able to obtain reliable dispersion maps for shorter periods, and to image smaller scale features.
publishDate 2012
dc.date.none.fl_str_mv 2012
2013
2013
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/75916
url http://hdl.handle.net/10261/75916
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1111/j.1365-246X.2011.05339.x
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Royal Astronomical Society
publisher.none.fl_str_mv Royal Astronomical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869406263224303616
score 15,81155

Similar Items