theoretical or methodological issues of seismic wave propagation and seismic methods. Literature shows a wide range of experiments, both in terms of materials used for the production of the physical models but also regarding the models geometry and the recording techniques, which are chosen according to the issue that is being addressed. With a proper choice of granulometries and deposition processes, we managed here to create a two-layer granular physical model with a relatively complex geometry and characterized by 2D structures, property contrast and velocity gradients within layers. We performed several small scale seismic acquisitions using a mechanical source and a laser vibrometer. The acquired seismograms were interpreted by applying the surface-wave method and by extracting P-wave refraction data. We managed to correctly reconstruct the geometry of the model and estimated the parameters controlling the velocity gradients of P and S waves for both layers. The results we got are coherent with the different compaction degree we obtained for the two layers and with previous studies conducted over similar media.

Physical Modelling of Seismic-wave Propagation over a Two Dimensional Granular Medium / Bergamo, Paolo; L., Bodet; Socco, Laura; R., Mourgues; V., Tournat. - ELETTRONICO. - (2012), pp. 1-5. (Intervento presentato al convegno Near Surface Geoscience 2012 – 18th European Meeting of Environmental and Engineering Geophysics tenutosi a Parigi (francia) nel 3-5 Settembre 2012) [10.3997/2214-4609.20143334].

Physical Modelling of Seismic-wave Propagation over a Two Dimensional Granular Medium

BERGAMO, PAOLO;SOCCO, LAURA;
2012

Abstract

theoretical or methodological issues of seismic wave propagation and seismic methods. Literature shows a wide range of experiments, both in terms of materials used for the production of the physical models but also regarding the models geometry and the recording techniques, which are chosen according to the issue that is being addressed. With a proper choice of granulometries and deposition processes, we managed here to create a two-layer granular physical model with a relatively complex geometry and characterized by 2D structures, property contrast and velocity gradients within layers. We performed several small scale seismic acquisitions using a mechanical source and a laser vibrometer. The acquired seismograms were interpreted by applying the surface-wave method and by extracting P-wave refraction data. We managed to correctly reconstruct the geometry of the model and estimated the parameters controlling the velocity gradients of P and S waves for both layers. The results we got are coherent with the different compaction degree we obtained for the two layers and with previous studies conducted over similar media.
2012
978-90-73834-34-7
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2504224
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