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Crustal Characteristics in the Subduction Zone of Mexico: Implication of the Tectonostratigraphic Terranes on Slab Tearing

Carciumaru, Dana and Ortega, Roberto and Castellanos, Jorge Castillo and Huesca-Pérez, Eduardo (2020) Crustal Characteristics in the Subduction Zone of Mexico: Implication of the Tectonostratigraphic Terranes on Slab Tearing. Seismological Research Letters, 91 (3). pp. 1781-1793. ISSN 0895-0695. https://resolver.caltech.edu/CaltechAUTHORS:20200228-124022167

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Abstract

During the past years, significant work has been done for studying the crustal anisotropy and state of stress of the Mexican subduction zone. At the same time, there is new evidence of the geometry of the subducted slab proposing subduction tearing. Here, we present a study of the Earth crust using three different methods: azimuthal anisotropy based on ambient noise, shear‐wave splitting of tectonic tremors, and moment tensor inversions of the earthquakes of 7 September 2017 M_w 8.2 Tehuantepec, Mexico. This earthquake initiated a seismic sequence that triggered shallow seismicity and aftershocks. The shallow earthquakes fall into a region where there were few published focal mechanism higher than M_w 4.5. Two slab tearings: in the Michoacán–Guerrero border and in central Oaxaca, best represent the slab geometry of the Mexican subduction zone. At the Michoacán–Guerrero, the subducted slab is subhorizontal, whereas in central Oaxaca the plate is characterized by northeast vergence. We interpret that the mantle’s flow in this part of the subducted slab produces multiple alignments in the crust and differentiates the tectonostratigraphic terranes of the southern region of Mexico.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1785/0220190117DOIArticle
ORCID:
AuthorORCID
Castellanos, Jorge Castillo0000-0002-0103-6430
Additional Information:© 2020 Seismological Society of America. Manuscript received 16 May 2019; Published online 26 February 2020. The authors acknowledge Jean Letort for providing his results of depth profiles. The authors acknowledge five anonymous reviewers for their critical comments that helped us improve the clarity of the article. The group of Universidad Nacional Autónoma de México (UNAM) in the Servicio Sismológico Nacional (SSN) operates the broadband stations; the authors thank them for the maintenance and support. The authors especially acknowledge Enrique Cabral‐Cano who is in charge of the OXNET. The authors acknowledge Victor Hugo Espíndola at UNAM who relocated the earthquakes used for the moment tensor analysis. The authors also thank the Incorporated Research Institutions for Seismology Data Management Center (IRIS‐DMC) for making the data available. The authors’ recognition is extended to the Dirección General de Asuntos del Personal Académico (DGAPA)‐Programa de Apoyo a Proyectos de Investigación e Innovación Tecnológica (PAPIIT) IN105816 and Consejo Nacional de Ciencia y Tecnología (CONACYT) 177676 projects for maintaining the GECO network. Financing support provided by DGAPA‐PAPIIT IN105816, CONACYT 270544, CONACYT 177676, CONACYT CB 133910, CICESE ULP 691115, CICESE ULP 691114, and “Catedras Jovenes Conacyt” Grant Numbers 097 and 2284. Data and Resources: We used data from the National Seismological Service of Universidad Nacional Autónoma de México (UNAM, http://www.ssn.unam.mx, last accessed March 2019) retrieved from the Servicio Sismológico Nacional (SSN) repository at stp.gps.caltech.edu. Enrique Cabral‐Cano provided the OXNET data at UNAM. Data also includes the Universidad Veracruzana (UV), GECO networks that also were obtained from the SSN repository. MesoAmerican Subduction Experiment (MASE) data were obtain from Incorporated Research Institutions for Seismology Data Management Center (IRIS‐DMC; http://www.iris.washington.edu, last accessed March 2019). Figures were made using the Generic Mapping Tools v.4.5.9 (www.soest.hawaii.edu/gmt, last accessed November 2017; Wessel and Smith, 1998). Supplemental material for this article includes a figure of the isodepth contours of Pardo and Suarez (1995) and the same features of Figure 1, and Table S1 (Table_S1.csv) that includes the moment tensor results and the time‐domain waveform inversions of each earthquake of Table S1.
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
Universidad Nacional Autónoma de México (UNAM)IN105816
Consejo Nacional de Ciencia y Tecnología (CONACYT)177676
Consejo Nacional de Ciencia y Tecnología (CONACYT)270544
Consejo Nacional de Ciencia y Tecnología (CONACYT)177676
Universidad Nacional Autónoma de México (UNAM)CB 133910
Universidad Nacional Autónoma de México (UNAM)CICESE ULP 691115
Universidad Nacional Autónoma de México (UNAM)CICESE ULP 691114
Consejo Nacional de Ciencia y Tecnología (CONACYT)097
Consejo Nacional de Ciencia y Tecnología (CONACYT)2284
Issue or Number:3
Record Number:CaltechAUTHORS:20200228-124022167
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200228-124022167
Official Citation:Dana Carciumaru, Roberto Ortega, Jorge Castillo Castellanos, Eduardo Huesca‐Pérez; Crustal Characteristics in the Subduction Zone of Mexico: Implication of the Tectonostratigraphic Terranes on Slab Tearing. Seismological Research Letters ; 91 (3): 1781–1793. doi: https://doi.org/10.1785/0220190117
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:101639
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Feb 2020 22:34
Last Modified:05 May 2020 20:38

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