Crustal Structure below the Valley of Mexico Estimated from Receiver Functions

Brief Report| December 01, 2010 Crustal Structure below the Valley of Mexico Estimated from Receiver Functions V. M. Cruz-Atienza; V. M. Cruz-Atienza Departamento de Sismología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica s/n, Ciudad Universitaria, 04510, México D.F.cruz@geofisica.unam.mxarturo@geofisica.unam.mx Search for other works by this author on: GSW Google Scholar A. Iglesias; A. Iglesias Departamento de Sismología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica s/n, Ciudad Universitaria, 04510, México D.F.cruz@geofisica.unam.mxarturo@geofisica.unam.mx Search for other works by this author on: GSW Google Scholar J. F. Pacheco; J. F. Pacheco Observatorio Vulcanológico y Sismológico de Costa Rica, Universidad Nacional de Costa Rica, Apartado 2346-3000, Heredia, Costa Ricajpacheco@una.ac.cr Search for other works by this author on: GSW Google Scholar N. M. Shapiro; N. M. Shapiro Département de Sismologie, Institut de Physique du Globe de Paris, Boite 89—4 place Jussieu, 75252 Paris cedex 05, Francenshapiro@ipgp.jussieu.fr Search for other works by this author on: GSW Google Scholar S. K. Singh S. K. Singh Departamento de Sismología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica s/n, Ciudad Universitaria, 04510, México D.F.krishnamex@yahoo.com Search for other works by this author on: GSW Google Scholar Author and Article Information V. M. Cruz-Atienza Departamento de Sismología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica s/n, Ciudad Universitaria, 04510, México D.F.cruz@geofisica.unam.mxarturo@geofisica.unam.mx A. Iglesias Departamento de Sismología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica s/n, Ciudad Universitaria, 04510, México D.F.cruz@geofisica.unam.mxarturo@geofisica.unam.mx J. F. Pacheco Observatorio Vulcanológico y Sismológico de Costa Rica, Universidad Nacional de Costa Rica, Apartado 2346-3000, Heredia, Costa Ricajpacheco@una.ac.cr N. M. Shapiro Département de Sismologie, Institut de Physique du Globe de Paris, Boite 89—4 place Jussieu, 75252 Paris cedex 05, Francenshapiro@ipgp.jussieu.fr S. K. Singh Departamento de Sismología, Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica s/n, Ciudad Universitaria, 04510, México D.F.krishnamex@yahoo.com Publisher: Seismological Society of America First Online: 14 Jul 2017 Online ISSN: 1943-3573 Print ISSN: 0037-1106 Bulletin of the Seismological Society of America (2010) 100 (6): 3304–3311. https://doi.org/10.1785/0120100051 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation V. M. Cruz-Atienza, A. Iglesias, J. F. Pacheco, N. M. Shapiro, S. K. Singh; Crustal Structure below the Valley of Mexico Estimated from Receiver Functions. Bulletin of the Seismological Society of America 2010;; 100 (6): 3304–3311. doi: https://doi.org/10.1785/0120100051 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract Receiver functions (RFs) from two permanent stations (CUIG and ZAIG) of the Mexican broadband network were calculated to infer the crustal structure at both sites. The data were stacked to allow uncertainty estimations and inverted using two global optimization algorithms: simulated annealing and genetic algorithms. Strong and systematic azimuthal dependence was observed in the stacked functions at CUIG site, which is located in the Mexican volcanic belt (MVB). Assuming a one-dimensional five-layer model per azimuthal stack, these variations were explained with the same upper crustal structure including a superficial ∼2 km-thick low-velocity layer associated with the MVB and a well-defined Conrad interface around 15 km depth, different depths for the Moho discontinuity, and variations in both the S-wave velocity and Poisson's ratio for the upper mantle. Our inversion of observed RFs at CUIG and theoretical considerations suggest an eastward crustal thickening of at least 5 km below the Valley of Mexico. We tested the sensitivity of the modeling procedure by applying it to the recordings at ZAIG station. In this case, no azimuthal dependence was noticed in the stacked functions. After a simultaneous inversion of three different azimuthal stacks, a single four-layer model satisfactorily explained all data, thus revealing a flat one-dimensional crustal model below the Mexican Mesa Central, where ZAIG station is located. These results support the resolution and robustness of the applied method at both sites. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.