ABSTRACT
Finding an underground opening is one of the most challenging exploration targets for a geophysicist. In addition to locating caves for exploration or scientific research, mapping hidden karst is necessary when engineering projects are planned in rock formations known to contain caves, because karstic voids and doline collapses can compromise the integrity of building foundations, dams, and bridges. Clay-filled voids in paleokarst can also jam rock-boring machines. Proper use of geophysical exploration for karstic voids can often help geotechnical engineers develop an effective programme of test borings and grouting, since if the bore spacing is greater than the cavity dimensions it is possible to miss it completely.
