Case studies of electrical and electromagnetic methods applied to mapping active faults beneath the thick quaternary

Suzuki, Koichi; Toda, Shinji; Kusunoki, Kenichi; Fujimitsu, Yasuhiro; Mogi, Tohru; Jomori, Akira

doi:10.1016/s0165-1250(00)80005-x

Cited by 36 publications

(29 citation statements)

References 13 publications

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“…The study is focused on fault detection from electrical tomography images, which are increasingly used in paleoseismology for positioning faults and for studying tectonic deformations in shallow layers (Suzuki et al, 2000;Demanet et al, 2001b, Louis et al, 2002Wise et al, 2003;Nguyen et al, 2003). These interpretation methods are applied on several synthetic models and on an experimental data set acquired during the European project PALEOSIS (Camelbeeck, 2000).…”

Section: Introductionmentioning

confidence: 99%

Image processing of 2D resistivity data for imaging faults

Nguyen

Garambois

Jongmans

et al. 2005

Journal of Applied Geophysics

102

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Section: Introductionmentioning

confidence: 99%

Image processing of 2D resistivity data for imaging faults

Nguyen

Garambois

Jongmans

et al. 2005

Journal of Applied Geophysics

102

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“…Faults might also be imaged in ERTs either as sharp resistivity contrasts (due to the juxtaposition of materials with distinct electrical responses) or by f lexed patterns in the resistivity fields, produced by the offsets within a unit along the fault plane (Colella et al, 2004;Galli et al, 2013;Suzuki et al, 2000).…”

Section: Resistivity/structure Relationshipsmentioning

confidence: 99%

Shallow architecture of Fuegian Andes lineaments based on Electrical Resistivity Tomography (ERT). Evidences of transverse extensional faulting in the central Beagle Channel area

Tassone

Menichetti

Cerredo

et al. 2017

andgeo

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ABSTRACT. The southern foothills of the Fuegian Andes are bounded by the Beagle Channel (BC), a conspicuous E-W longitudinal basin, controlled by a large transcurrent fault system, which extends from the Atlantic to the Pacific Ocean. The northern shore of the Beagle Channel's central segment is characterized by several E-W oriented valleys, parallel to the main basin, which are interspersed with a series of oblique NW trending lineaments that extend across the mountain belt. A geoelectrical survey was carried out in order to investigate the shallow architecture of such sets of linear morphologies. The principal E-W lineament system was characterized by conspicuous sub-vertical resistivity contrasts, interpreted as fractured zones associated with fault strands of the main strike-slip Beagle Channel system, whereas the oblique NW-SE trending set of lineaments revealed slightly different resistivity patterns, with vertical displacements and less abrupt contrasts. These resistivity patterns, in combination with the widespread occurrence of normal faulting in the area, allowed to infer an extensional control over the oblique depressions. These morphological features were related to oblique transverse faults that segment two sub parallel E-W fault systems. The oblique faults were probably developed along inherited structural anisotropies and can be extended well beyond the BC shoreline to the NW. Both geophysical and field evidence suggest a post-glacial deformation along the area. RESUMEN. Arquitectura somera de lineamientos en los Andes Fueguinos basada en estudios de Tomografía de Resistividad Eléctrica (TER). Evidencias de fallamiento transverso extensional en el área central del canal deBeagle. La cordillera Fueguina está limitada al sur por el canal de Beagle, una gran fosa longitudinal que se extiende desde el océano Atlántico al este, hasta el Pacífico al oeste y está desarrollada sobre un sistema de fallamiento regional transcurrente. La costa norte del segmento central del Canal está caracterizada por la intersección de valles paralelos a la fosa principal con una serie de lineamientos morfológicos oblicuos de orientación NW-SE, los cuales se extienden a través del sistema montañoso. Se llevó a cabo un relevamiento de Tomografía de Resistividad Eléctrica con el objetivo de investigar la arquitectura somera de los diferentes juegos de lineamientos observados en el sector y dilucidar el control estructural que determina su geometría. Los resultados muestran que el sistema de lineamientos E-W está caracterizado por un patrón de resistividades con marcados contrastes de disposición subvertical interpretadas como

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“…Geophysical surveys can assist in the location of active structures in the subsurface, and integrating the results from multiple geophysical methods can provide detailed information on the nearsurface conditions. From these, ground penetrating radar (GPR), seismic and electromagnetic or resistivity methods have been shown to be particularly useful (e.g., Benson and Mustoe 1995;Suzuki et al 2000;McBride and Stephenson 2003;Wise et al 2003;Khesin 2004;Nguyen et al 2007; Abstract The Concud Fault is a ~14-km-long active fault that extends close to Teruel, a city with about 35,000 inhabitants in the Iberian Range (NE Spain). It shows evidence of recurrent activity during Late Pleistocene time, posing a significant seismic hazard in an area of moderate-to-low tectonic rates.…”

Section: Introductionmentioning

confidence: 99%