Abstract
The authors developed a non-destructive method to measure depth of crack appearing on rock surface, which utilizes change in polarity of first motion of diffracted P-wave.The following results were obtained through experiments using mortar specimens:1) Depth of slit and artificial crack as deep as 10 cm could be easily and rapidly determined.2) Depth of water-filled slit could also be measured.3) Angle of inclined slit could be measured.Results of in-situ tests for three types of rock, namely, sandstone, tuff and granodiorite are as follows:1) Depth of crack as deep as 80 cm could be easily and rapidly determined.2) Angle of inclined crack could be measured.3) This method could be applied for cracks which are parallel to the measuring surface.4) Depths of tightly closed cracks could not be determined by this method.5) Depths of all cracks could be determined for granodiorite. For sandstone and tuff, however, depths of about a half of cracks could be determined.
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