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Title: Application of Resistivity and Seismic Refraction Tomography for Landslide Stability Assessment in Vallcebre, Spanish Pyrenees
Author: Himi, Mahjoub
Anton, Mickel
Sendrós Brea-Iglesias, Alex
Abancó i Martínez de Arenzana, Clàudia
Ercoli, Maurizio
Lovera Carrasco, Raúl
Deidda, Gian Piero
Urruela, Aritz
Rivero Marginedas, Lluís
Casas i Ponsatí, Albert
Keywords: Esllavissades
Tomografia sísmica
Seismic tomography
Issue Date: 14-Dec-2022
Publisher: MDPI
Abstract: Geophysical surveys are a noninvasive reliable tool to improve geological models without requiring extensive in situ borehole campaigns. The usage of seismic refraction tomography (SRT), electrical resistivity tomography (ERT) and borehole data for calibrating is very appropriate to define landslide body geometries; however, it is still only used occasionally. We present here the case of a Spanish Pyrenees slow-moving landslide, where ERT, SRT and lithological log data were integrated to obtain a geological three-dimensional model. The high contrasts of P-wave velocity and electrical resistivity values of the upper materials (colluvial debris and clayey siltstone) provided accurate information on the geometry of the materials involved in the landslide body, as well as the sliding surface. Geophysical prospecting allowed us to identify the critical sliding surface over a large area and at a reduced cost and, therefore, gives the geophysical method an advantage over borehole data. The three-dimensional model was used to carry out stability analyses of a landslide in 2D and 3D, which, coherently with previous studies, reveal that the lower part is more unstable than the upper units.
Note: Reproducció del document publicat a:
It is part of: Remote Sensing, 2022, vol. 14, num. 24, p. 6333
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ISSN: 2072-4292
Appears in Collections:Articles publicats en revistes (Mineralogia, Petrologia i Geologia Aplicada)

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