Collapse hazard assessment in evaporitic materials from ground penetrating radar: a case study |
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Authors: | Tomás Martín-Crespo David Gómez-Ortiz |
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Institution: | (1) área de Geología, Dpto. de CC. de la Naturaleza y Física Aplicada, ESCET, Universidad Rey Juan Carlos, C/Tulipán s/n, 28933 Móstoles (Madrid), Spain |
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Abstract: | Evaporitic materials have been studied by means of ground penetrating radar (GPR) in order to evaluate the collapse hazard.
The obtained 200 MHz GPR profiles show a low signal-noise ratio over the first 3 m depth, where well-defined and continuous
reflectors can be observed. Between 3 and 4.5 m depth, the signal to noise ratio decreases due to attenuation of the electromagnetic
(EM) waves. As a result, reflectors located deeper than 3 m become more discontinuous and poorly defined. GPR profiles show
trails of continuous and subhorizontal reflectors, with a slightly undulated and irregular geometry. Although some of these
reflectors laterally vanish or seem to disappear, sudden interruptions or hyperbolic reflections that could be originated
by the occurrence of cavities have not been detected. These reflectors have been interpreted as corresponding to several evaporitic
layers (gypsum) that constitute the main lithology in the area. Clear interruptions of reflectors have only been observed
in some GPR profiles, and they could be attributed to small (1–2 m long) subvertical faults, with only a few centimetres offset.
These faults may be generated by the accommodation of the evaporitic layers to local collapses affecting deeper materials. |
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Keywords: | Risk assessment Geohazards Ground penetrating radar Spain |
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