Basement Mapping with Single-Station and Array Ambient Vibration Data: Delineating Faults under Boumerdes City, Algeria

Hellel, Mustapha; Oubaiche, El Hadi; Chatelain, Jean‐Luc; Machane, Djamel; Bensalem, Rabah; Guillier, Bertrand; Cheikhlounis, Ghani

doi:10.1785/0220110142

Cited by 21 publications

(4 citation statements)

References 30 publications

(8 reference statements)

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“…Investigaciones recientes (ej. : Hellel et al 2012) han utilizado el método de Nakamura como complemento en la investigación de fallamientos y profundidad de estratos hasta el lecho rocoso. Considerando que existe una relación teórica entre la velocidad de la onda de corte Vs y el periodo o frecuencia del suelo f, donde la Vs representa en cierta medida la rigidez de los estratos que atraviesa, es decir que suelos más rígidos tendrán velocidades mayores que suelos menos rígidos, y que adicionalmente la profundidad del estrato nos da una idea de la masa involucrada se podrían interpretar estas variaciones bruscas de frecuencia como: 1) los estratos a un lado y al otro de la línea tienen velocidades de onda de corte diferentes, y 2) Exista una variación del estrato de suelo sísmicamente activo, siendo de mayor profundidad en la zona al Oeste de la línea de trazo (frecuencias bajas) y de menor profundidad en la zona al Este de la línea de trazo (altas frecuencias).…”

Section: Resultsunclassified

Microzonificaciónsísmica basada en efectos de sitio para el área metropolitana de Mendoza

Giolo

Frau²,

Guillier³

et al. 2020

AJEA

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El ordenamiento territorial de una región debe contemplar distintos aspectos que hacen a las características del entorno y al hábitat humano inserto en ella. Algunos de los peligros potenciales asociados a la actividad sísmica son la licuación de suelos, deslizamiento de tierras, caída de rocas, efectos de sitio debido a terremotos, variaciones topográficas, tsunamis entre otros. En particular la respuesta de sitio puede ser evaluada por métodos teóricos o empíricos. Los métodos teóricos permiten un análisis más detallado de los diferentes estratos de suelo y los métodos empíricos se basan en el registro de vibraciones producidas por terremotos u otras causas en sitios de diferentes condiciones geológicas. Entre los métodos experimentales para considerar efectos locales, han tenido gran aceptación en las últimas décadas los basados en vibraciones ambientales. En el presente trabajo se escoge un área de gran densidad poblacional en la Ciudad de Mendoza, Argentina para realizar una microzonificación sísmica en base a frecuencias naturales de suelo que se obtienen mediante el procedimiento del cociente espectral H/V. De esta manera se pretende identificar las áreas expuestas al fenómeno de amplificación sísmica cuando sobrevenga un terremoto de mediana o elevada magnitud. Este estudio permitirá contar con información de utilidad para la organización del uso del suelo y la planificación urbana.

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Section: Resultsunclassified

Microzonificaciónsísmica basada en efectos de sitio para el área metropolitana de Mendoza

Giolo

Frau²,

Guillier³

et al. 2020

AJEA

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“…CityShark II has been successfully used in various types of ambient vibration studies: buildings (Figure 9 and [6][7][8][9][10][11]), arrays (Figure 10 and [12][13][14][15]), landslides [15] and single-station (H/V) (Figure 3 and [16][17][18][19][20][21][22]).…”

Section: Resultsmentioning

confidence: 99%

Ambient Vibration Recording for Single-Station, Array and Building Studies Made Simple: CityShark II

Chatelain¹,

Guillier²,

Guéguen³

et al. 2012

IJG

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This article describes an improved data acquisition system from a previous system dedicated to one-sensor site studies, aimed at recording ambient vibrations (microtremors). A multi-channel and/or remote triggering system is proposed. The system was conceived by IRD-Leas, France, and used at ISTerre, France, for research activities. The size, weight of this high quality system and its autonomy (no need to be connected to a laptop) make it a real portable device. The system acquires data with 24-bit delta-sigma ADCs in the 10 - 1000 sps range at 10 - 20 bit resolution on up to 18 channels in the multi-channel version. The input stage dynamics is available at ±2.5 V or ±5 V. The dynamic range varies, for example, from 108 dB at 100 sps to 90 dB at 250 sps. Gain is selectable from 1 (0 dB) to 8192 (78 dB) by powers of two (6 dB). Its very low level of internal noise allows recording of very low tension signals without missing code. Continuous recording and GPS may also be implemented in the system. While primarily dedicated to ambient vibration recordings, this system can be connected to any type of device delivering an output tension in the ±5 V range

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“…Mapping of the subsurface structures using ambient vibration wave-field measurements is a common practice in geophysical prospecting (e.g. Fäh 1997;Bard 1998;Roten et al 2006;Hellel et al 2012). It has become increasingly attractive in a broad range of seismological disciplines at different scales, because of the relatively simple and efficient data acquisition (e.g.…”

Section: Introductionmentioning

confidence: 99%

Fault zone signatures from ambient vibration measurements: a case study in the region of Visp (Valais, Switzerland)

et al. 2013

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Investigations of tectonic features, such as faults, are important challenges for geologists and engineers. Although direct investigational methods, such as boreholes and trenches, have the potential to provide accurate data, these direct methods are usually expensive and time consuming, and give only punctual insights into subsurface structures. Geophysical methods, for example electric surveys and ground penetrating radar, are less expensive and faster to implement. However, these geophysical methods may be difficult or sometimes even impossible to apply in regions with rough topography or regions which are highly urbanized. In this study, we propose an easy-to-use and affordable method to detect fault zones based on ambient vibration observations. We apply this method in the region between Visp and Unterstalden (canton Valais, Switzerland) on a small fault branch, which has no explicit surface expression, and which is linked to a major fault zone, the Simplon Fault Zone. The assumption is that the fault of interest is surrounded by damage zone consisting of fractured rock, and that this results in lateral changes of both seismic velocity and attenuation. The objective was, first, to identify such lateral changes in the observed seismic wave-field, and second, to map any anomalies and combine them with the available geological information. In this way, we were able to follow the fault trace even without a clear surface expression of the fault. Our observations showed the existence of a signature in the power spectra of the seismic noise that may correspond to a damage zone. Such signature is observed along the trace of the expected fault.

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Basement Mapping with Single-Station and Array Ambient Vibration Data: Delineating Faults under Boumerdes City, Algeria

Cited by 21 publications

References 30 publications

Microzonificaciónsísmica basada en efectos de sitio para el área metropolitana de Mendoza

Microzonificaciónsísmica basada en efectos de sitio para el área metropolitana de Mendoza

Ambient Vibration Recording for Single-Station, Array and Building Studies Made Simple: CityShark II

Fault zone signatures from ambient vibration measurements: a case study in the region of Visp (Valais, Switzerland)

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