Application of resistivity and magnetometry geophysical techniques for near-surface investigations in karstic terranes in Ireland

Extensive glacial surficial deposits in Ireland prevent the identification of man, v karst features. Surface magnetic and resistivity geophysical measurements have been used to identify unknown karstie./eatures. Two dimensional resistivity imaging has located an unknown 210-meter-long, 70-meter-wide and 25-meter-deep collapse feature in eastern Ireland beneath the surficial sediments. A resistivity survey over the Cloyne cave system in County Cork has identified the position of an unknown cave. A magnetic investigation of an infilled paleokarst collapse structure produced a 40 nano Tesla anomaly and illustrates that the technique can be employed in Ireland to locate unknown ones.