Geophysical Surveys and Modelling for Recognizing of Gypsum Karst

Geophysical surveys are often used for examination of karst phenomena in limestone. This paper presents the research on gypsum karst which occurrence is much rarer. Non-invasive terrain surveys were carried out over known karst cavity in order to visualize karst phenomena developed around the void. Two geophysical methods that seems to be predestined for karst examination were selected, i.e. microgravimetry and georadar. For the interpretation of measured data numerical modelling was applied. Geophysical interpenetration depicted the presence of weathered material in the near surface zone and fractures and loose zones located over the karst cavity.