The investigation of waste disposals is not an easy task in geophysics. The general approximations, like homogeneous, near horizontal layers are not valid. That’s why besides conventional seismic methods new developments are necessary. On some recultivated old waste disposals the accumulation of organic originated gases (biogases) can endanger buildings, which is an other challenge for geophysics. ELGI has driven a project to try to solve those problems. The first step was to make test measurements on a typical location, and to compare and evaluate the results of different seismic methods. P-, S-wave refraction, reflection, diving wave tomography and surface-wave methods were tested. In deep seismics AVO (Amplitude-Versus-Offset) analysis seems to be the proper tool for direct gas detection, but in shallow cases the poor signal to noise ratio of reflected signals makes its application impossible. In highly inhomogeneous medium new methods needed. The first results are promising, on the test location the gas accumulation could have been detected and evaluated by drilling. In the recent years we want to continue the project to investigate more waste disposals for further testing of our method.


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