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Here are some USGS Web pages with more information on borehole logging and Anywhere:

Borehole geophysics as applied to geohydrology Project summary, photos of logging truck, and bibliographies on log interpretation techniques and instrumentation to record geophysical data in wells and test holes to study ground water hydraulics and evaluate waste disposal sites. (Score: 1.000)

Geophysical Equipment Office of Ground Water (Score: 1.000)

Geophysical Models Office of Ground Water (Score: 1.000)

Introduction to Borehole Geophysics (Score: 1.000)

Borehole Velocity Measurements at Five Sites That Recorded the Cape Mendocino, California Earthquake of 25 April, 1992 (Score: 0.355)

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About borehole logging:

Definition: A survey operation in which instruments are lowered into a borehole to measure the physical characteristics of the borehole environment and the borehole itself as a function of depth. [Adapted from Soc. Professional Well Log Analysts Glossary, link]