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Título del libro: 83rd Eage Conference And Exhibition 2022
Título del capítulo: Seismic refraction and ambient noise methods to explore the extension of soft materials in a landslide

Autores UNAM:
MARTIN CARDENAS SOTO; JESUS SANCHEZ GONZALEZ; JOSE ANTONIO MARTINEZ GONZALEZ; DAVID ESCOBEDO ZENIL; GERARDO CIFUENTES NAVA; THALIA ALFONSINA REYES PIMENTEL;
Autores externos:

Idioma:

Año de publicación:
2022
Palabras clave:

Acoustic noise; Refraction; Seismology; Surface waves; Tomography; Topography; Velocity; Ambient noise; Ambient noise tomographies; Group velocities; Mexico City; Seismic refraction; Softer materials; Test site; Tomography methods; Velocity tomography; Wave group; Landslides


Resumen:

A portion of the west of Mexico City is a densely populated area located in an abrupt topography, whose volcano-sedimentary materials increase the likelihood of landslides. This study uses Seismic Refraction (RS) and Ambient Noise Tomography (ANT) methods to estimate the extent of landslide-prone materials at a test site. We generate a horizontal Vp tomography image of the substratum and produce surface-wave group velocity tomographies of RS and ANT in the frequency range of 6 to 26 Hz. The best velocities correlation between the two methods is around 24 Hz. The results show the areas of low velocity associated with materials that had been lost their resistance due to the increase in pore pressure (Vs < 100 m/s) and the areas where eventually more landslides will occur (120 < Vs < 200 m/s) if mitigation work is not carried out. The most stable zones correspond to materials with velocity values greater than 250 m/s that overlap a substratum at an average depth of 8 m. In the case of a high risk of landslide, when it is not advisable to perform active source experiments, ANT can provide good results to determine the extension of the sliding materials. Copyright © 2022 by the European Association of Geoscientists & Engineers (EAGE). All rights reserved.


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