Application of Surface-Wave Analysis for Mineral Exploration: A Case Study from Central Sweden
M. Papadopoulou, F. Da Col, L.V. Socco, E. Bäckström, M. Schön, P. Marsden and A. Malehmir
Event name: 2nd Conference on Geophysics for Mineral Exploration and Mining
Session: Progress in Seismic Imaging of Mineral Deposits I
Publication date: 09 September 2018
Info: Extended abstract, PDF ( 2.43Mb )
Near-surface velocity models are important for deep imaging of mineral deposits with seismic exploration. The near-surface can be quite complex from loose, highly heterogeneous materials to stiff, fractured rocks. Surface-wave analysis can be an effective method to image the shallow subsurface of such challenging environments. Here, we propose a workflow that includes several processing and inversion steps. Initially, for the optimization of the processing parameters, we assess the presence of sharp lateral variations with a method based on the measured energy of Rayleigh waves. Then, using a moving window of receivers, we extract Rayleigh-wave dispersion curves along the acquisition line as the maxima of the f-k spectrum. Finally, the dispersion curves are inverted using a laterally constrained inversion scheme. The proposed methodology has been tested on legacy data from a mining field.