Journal
JOURNAL OF APPLIED GEOPHYSICS
Volume 68, Issue 3, Pages 301-313Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jappgeo.2009.02.001
Keywords
Body waves; Seismic refraction tomography; Water table
Funding
- COFIN 2005 [2003049828_002]
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Recently, there has been increased interest in the use of refraction seismic data for the exploration and development of hydrological reservoirs. The aim of this study is to provide a procedure in order to identify groundwater levels by means of seismic refraction profiles. Assuming that the velocity of shear waves increases much less than the velocity of compressional waves in a saturated soil, seismic refraction surveys were performed for the determination of the water table. In order to have a perfect overlay of the tomography 2D grids, P and S wave seismic profiles were obtained with the same geometrical configuration. Based on the propagation of the P and S waves in the unsaturated and saturated media, a Water Seismic Index (WSI) was defined. WSI is related to the local variations of the P and S wave velocities and, in theoretical terms, it is correlated to groundwater level. Preliminary results indicate that there is a good agreement between the depth of the ground water and the WSI parameter. (C) 2009 Elsevier B.V. All rights reserved.
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