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LANDSTREAMERS AND SURFACE WAVES: TESTING AND RESULTS
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 19th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, Apr 2006, cp-181-00105
Abstract
Surface wave data acquisition by landstreamer with flat baseplates produces nearly identical dispersion curves to that from planted geophones. Dependence on geophone frequency and good<br>coupling is negligible and repeatability is fair. ‘Pseudo’ 2D profiling using 1D inversion at high shot density produces accurate subsurface images. However, ‘pushing’ a spread over the termination of a soft-layer pinchout can lead to overestimation of its lateral extent by up to 20% of the spread length. Shorter spreads show less lateral scattering but large shot-geometry dependence, and the response is dominated by the material under the shot / nearer-offset channels.