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Geophysical Studies Progress at Site B - Methods and Findings

Explore the geophysical studies progress at Site B, including the use of DC resistivity sounding and electromagnetic profiling methods to map variations in electrical resistivity and conductivity. The study also involves conducting electrical cross-sections and surveys to detect geological features and metallic objects.

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Geophysical Studies Progress at Site B - Methods and Findings

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  1. GEOPHYSICAL STUDIES SITE B GEOPHYSICAL STUDIES PROGRESS OSPER PROJECT SITE B BRUCE SMITH ROBERT BISDORF RAY HUTTON MARK TABACHECK ROBERT HORTON

  2. GEOPHYSICAL METHODS USED • DC RESISTIVITY SOUNDING • obtain variation in electrical resistivity as a function • of depth (to about 40 meters) • ELECTROMAGNETIC PROFILING (EM31) • obtain variation in electrical conductivity as a function • of position (mapping lateral variations) 3 to 6 meters • TOTAL FIELD MAGNETICS (not discussed) geologic mapping detect magnetic metallic objects (oil field pipes etc.) • ELECTROMAGNETIC PROFILE (EM34…not discussed) • depth to 40m but very noisy due to metallic pipes

  3. DC RESISTIVITY

  4. B SITE LOCATIONDC RESISTIVITY SOUNDINGS

  5. DC SOUNDINGS SITE B

  6. ELECTRICAL CROSS SECTION SITE B RESISTIVITY (ohm meters) CONDUCTIVITY (millisiemens) ρ = 1000/σ(ms) σ(ms) = 1000/ρ 100 ohm meters = 10 ms

  7. WEATHERED BEDROCK RESISTIVITY SOUNDING SITE B CONDUCTIVITY 1000 100 10

  8. EM31 CONDUCTIVITY SURVEY Vertical dipoles depth ~4.5m Horizontal dipoles depth ~2.25m

  9. EM31 HMD 2.25m depth map

  10. EM31 VMD 4m depth map

  11. EM31 HMD 4m 1960 Photo

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