P066 Evaluation of the danger of ground surface damage in mining areas based on migrating cavities effect in seismic and gravity surveys Introduction 1 Seismic and gravity surveys were carried out over the mining area of the “Wirek-Polska” coalmine in Chorzów Poland. The surveys covered the area of old shallow workings which still pose the risk of ground surface damage. The study area is built of Carboniferous rocks covered by Quaternary deposits: loamy sands and clays of a few meters thickness. Sandstones mudstones shales and coal seams of series 500 represent the Carboniferous there. The erosion surface of those rocks


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