Abstract
Rock falls and the collapse of base rock constitute serious problems in road maintenance and disaster prevention. Progressive cracking within base rock is considered to be a practical cause of collapse. In estimating the danger of base rock collapse, it is very important to detect beforehand not only the surface distribution of cracks but also the extent of internal cracking. Ground probing radar (GPR) measurements were carried out on the vertical wall of a welded tuff rock quarry with the objective of studying the applicability of GPR to mapping the distribution and continuity of cracks inside the rock. By using GPR, reflected waves from cracks within the base rock were detected to a depth of about 4 m. By comparing the GPR records with the condition of cracks visible at the rock surface, it was also confirmed that the electromagnetic waves were most strongly reflected by cracks containing water.
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