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H/V Ratio as an Indicator for Cavity Detection : Numerical and Experimental StudyNormal access

Authors: C. Filippi, D. Leparoux, G. Grandjean, A. Bitri and P. Côte
Event name: 80th EAGE Conference and Exhibition 2018
Session: Near Surface - Mining Geophysics
Publication date: 11 June 2018
DOI: 10.3997/2214-4609.201801009
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 1.65Mb )
Price: € 20

In the aim to contribute to identify the capacity of Rayleigh waves for underground cavities detection, we propose a combined approach based on numerical and experimental data obtained in a reduced-scale laboratory. We propose to calculate the H/V ratio of the wave field in presence of a void. First, the study is conducted on a homogeneous model. It shows that the positions of H/V anomalies depend on the cavity depth and are invariant with the diameter of the cavity. The results are then confirmed in an experimental bi-layer model. Thus, the H/V ratio seems to be a robust observable for cavity detection.

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