Integrated Use of Surface-Geophysical Methods to Indicate Subsurface Fractures atMilford, New Hampshire

摘要

Four surface-geophysical methods were used to indicate the presence and estimatethe orientations of subsurface fractures at a site in Milford, New Hampshire. The methods used were ground-probing radar, inductive terrain conductivity, direct-current resistivity, and seismic refraction. Three of the four geophysical data sets contain anomalies that are interpreted as representing subsurface fracturing. Interpretation of the individual data sets yields some conflicting results; however, an integrated interpretation indicates one fracture set that trends northeast and possibly a second set that trends northwest. These local fracture orientations are consistent with mapped regional orientations found in previous studies.