Safety and economic consequences of tunneling in unknown/uncharacterized areas are often too large due to possible inflow of water or failure of the surrounding rock mass. To minimize such risk in general core drilling is used to characterize the tunneling sites. Usually, due to the cost there are not enough holes to perform accurate enough estimates. Geophysical chacacteristics of boreholes are commonly used in hard rock but the interpretation techniques still have far to go. Interpretation is usually quantitative, that is locating and correlating anomalous zones. Nevertheless, the data obtained from geophysical logs can in some cases yield information that cannot be obtained from the core alone.


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