Teleseismic measurements of upper mantle shear wave anisotropy in the Isthmus of Tehuantepec, Mexico

Author:

Soto Gerardo León1,Valenzuela Raúl W2,Arceo R3,Huesca-Pérez Eduardo4ORCID,Rosas Ricardo Vazquez1

Affiliation:

1. Instituto de Investigaciones en Ciencias de la Tierra, Universidad Michoacana de San Nicolás de Hidalgo, 58030 Morelia, Mich., Mexico

2. Departamento de Sismología, Instituto de Geofísica, Universidad Nacional Autónoma de México, 04510. Mexico City, D. F., Mexico

3. Facultad de Ciencias en Física y Matemáticas, Universidad Autónoma de Chiapas, 29050, Tuxtla Gutiérrez, Chiapas., Mexico

4. CONACYT – Centro de Investigación Científica y de Educación Superior de Ensenada, Unidad La Paz, La Paz, Baja California Sur, México

Abstract

Summary Shear wave splitting measurements in the Isthmus of Tehuantepec (IT), southern Mexico, inferred from teleseismic core phases are presented. Measurements were made along a south-to-north profile across the IT. The results show a predominantly trench-normal pattern of fast polarization orientations with averaged delay times up to 2.2 s. Fast orientations near the trench suggest a corner flow in the mantle wedge and an entrained flow in the subslab region. Away the trench, fast orientations are parallel to the Absolute plate Motion, suggesting that the anisotropy in that region is driven by a simple asthenospheric flow. A comparison with splitting measurements made in the Mexican subduction zone shows a 17º clockwise rotation of the fast orientations of between east and west Mexico. This is consistent with the observed change in orientation of 19º clockwise in the Middle America Trench (MAT). This suggests that the rotation of the fast orientations is controlled by the change of orientation in the MAT.

Publisher

Oxford University Press (OUP)

Subject

Geochemistry and Petrology,Geophysics

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