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3-D travel-time tomography of southernmost Baja California Peninsula

Huesca-Pérez, Eduardo and Gutierrez-Reyes, Edahí and Valenzuela, Raúl W. and Husker, Allen and Mayer, Sergio (2021) 3-D travel-time tomography of southernmost Baja California Peninsula. Journal of South American Earth Sciences, 105 . Art. No. 102966. ISSN 0895-9811. doi:10.1016/j.jsames.2020.102966. https://resolver.caltech.edu/CaltechAUTHORS:20210610-074421045

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Abstract

A three-dimensional P and S-wave travel-time tomography, as well as Vp/Vs ratio images, were obtained for the southernmost tip of the Baja California Peninsula in Mexico. The area analyzed include Los Cabos block and part of the Gulf coast. The tomography obtained reveals in detail the heterogeneities of the crustal seismic velocity structure of the Los Cabos block. Results show an overall low velocity structure for both P- and S-waves under the Baja California peninsula down to a depth of ~25 km around the peninsular axis, particularly under Sierra La Laguna and near the Gulf of California (GoC) coast. Low P- and S-wave velocities are also present under the Gulf near the coast whereas fast velocities are observed under the Gulf away from the shoreline. Low and high Vp/Vs ratios are observed to alternate throughout the study area. The low seismic velocities may be explained because the crust in Los Cabos block is highly fractured and fluid-saturated, and has a high heat flux which is manifested as geothermal activity (e.g. hot springs observed all along the block). These low body wave velocities coincide with the existence of an asthenospheric mantle sandwiched by the continental crust of the Los Cabos block and a stalled subducted slab reported by Di Luccio et al. (2014). This mantle strip may be chemically depleted or dry inhibiting the development of active post-subduction volcanism.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.jsames.2020.102966DOIArticle
ORCID:
AuthorORCID
Huesca-Pérez, Eduardo0000-0002-6928-6866
Gutierrez-Reyes, Edahí0000-0001-9065-4144
Husker, Allen0000-0003-1139-0502
Additional Information:© 2020 Elsevier Ltd. Received 29 July 2020, Revised 14 October 2020, Accepted 14 October 2020, Available online 24 October 2020. We are grateful to the CICESE staff and Alfredo Aguirre for station maintenance and to Loic Peiffer for his geochemical assistance to understand the nature of hot springs in the Los Cabos block, as this was fundamental to interpret the results. Also to Roberto Ortega for helping to improve this manuscript. We want to thank Cicese, Unidad La Paz for their financial support (internal project 691115) and Conacyt (project 97). We also want to thank two anonumous reviewers for their comments that helped to strength the findings of this study. Some figures were made using the Generic Mapping Tools (GMT) package (Wessel and Smith 1998). Author statement: Eduardo Huesca-Pérez: he is the corresponding author, performed the tomographic computations, wrote and modified the manuscript and interpreted the results. Edahí Guitierrez-Reyes: he wrote the 3D ray path tracing software and updated a 2D original tomography software to 3D. Raúl W. Valenzuela: he helped to the conceptualization of ideas and writing and editing. Allen Husker: He helped with the formal analysis of results, and conceptualization of ideas; also he helped with writing and editing. Sergio Mayer: Data Curation, he located hypocenters and maintains the data set and update the catalogue. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Funders:
Funding AgencyGrant Number
Cicese, Unidad La Paz691115
Consejo Nacional de Ciencia y Tecnología (CONACYT)97
Subject Keywords:Composition and structure of the continental crust; Structure of the earth; North America; Seismic tomography
DOI:10.1016/j.jsames.2020.102966
Record Number:CaltechAUTHORS:20210610-074421045
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210610-074421045
Official Citation:Eduardo Huesca-Pérez, Edahí Gutierrez-Reyes, Raúl W. Valenzuela, Allen Husker, Sergio Mayer, 3-D travel-time tomography of southernmost Baja California Peninsula, Journal of South American Earth Sciences, Volume 105, 2021, 102966, ISSN 0895-9811, https://doi.org/10.1016/j.jsames.2020.102966.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:109460
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Jun 2021 16:34
Last Modified:10 Jun 2021 16:34

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