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Land Magnetometer Training Course

Magnetic Theory ½ day Hardware (G858/AP) ¼ day Software (MagMap / MagPick) ¼ day Hardware setup (858 and GPS) ½ day Survey ½ day Processing ½ day Review ½ day. Land Magnetometer Training Course. Geometrics, Inc. Premier Manufacturer of Land Magnetometers.

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Land Magnetometer Training Course

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  1. Magnetic Theory ½ day • Hardware (G858/AP) ¼ day • Software (MagMap / MagPick) ¼ day • Hardware setup (858 and GPS) ½ day • Survey ½ day • Processing ½ day • Review ½ day Land Magnetometer Training Course

  2. Geometrics, Inc.Premier Manufacturer of Land Magnetometers

  3. GEOMETRICS MAGNETOMETERS-tools for exploration Applications: • Map Geology for Mining, Oil/Gas Exploration • Environmental Survey for Tanks, Barrels • Locate Utilities, Pipelines • Military Uses, UXO-EOD, De-mining • Archaeology • Used in Land-Marine-Airborne Surveys

  4. GEOMETRICS: a 30-year history of building magnetometers • 1969: G-801 & G-803 marine and airborne proton magnetometers • 1971: G-806 land and marine proton magnetometer • 1973: G-816 portable proton magnetometer • 1977: G-826 portable digital magnetometer • 1981: G-856 portable memory magnetometer • 1983: G-811 marine magnetometer • 1991: G-822L military magnetometer • 1992: G-825 military diver-held magnetometer • 1992: G-822A airborne cesium magnetometer • 1995: G-858 portable cesium magnetometer • 1996: G-880 marine cesium magnetometer • 1997: G-823A airborne cesium magnetometer with counter • 1998: G-881 marine light-weight cesium magnetometer • 2003: G-882 marine cesium magnetometer • 2005: G-859 cesium mining magnetometer • 2009: UAV, AUV testing • 2013: G-860 land cesium magnetometer • 2014: G-862RBS cesium base station

  5. Magnetometer Configurations

  6. UXO Magnetometer Configurations

  7. Sensor Noise – Spin analysis

  8. Sensor Noise – Tumble Analysis

  9. Sensor Noise – Various Motions

  10. Earth’s Magnetic Field Diagram

  11. Earth’s Magnetic Field – Solar effects Earth’s Magnetic Field:detection of magnetic anomalies • Earth’s dipole (N-S) magnetic field is produced by internal iron core dynamo effect. Charged particles from the sun cause a bow shock wave in the magnetosphere which leads to Diurnal Variations • Earth’s dipole magnetic field is perturbed by relatively localized contrasts in magnetization. • Magnetization contrasts are caused by ferrous debris, vessels, pipelines, communication cables, magnetic minerals (predominantly magnetite). • With magnetometers, one can measure the total field to detect the magnetic anomalies associated with contrasts.

  12. Earth’s Total Magnetic Field

  13. Earth’s Magnetic Inclination

  14. Diurnal Variations

  15. Optional Diurnal / Base Station Monitor Use either G-858 or G-856 Magnetometers Monitor Magnetic Diurnal Variations Magnetometer in fixed location Synchronized clocks 1-30 second sample rate Use for correction of survey data Produce more accurate magnetic maps

  16. Sensor Dead Zone Diagram

  17. Sensor Diagrams - CSAZ

  18. Sensor Dead Zone – 0 Degree Tilt

  19. Sensor Dead Zone – 45 Degree Tilt

  20. Results of Survey profile width

  21. Anomaly patterns as a result of Inclination

  22. Anomaly width versus depth

  23. Depth estimate

  24. Nomogram

  25. Anomalies of common objects

  26. Vertical Gradient Applications

  27. Wearing the G-858

  28. Gradiometer Transverse Layout G-858 CESIUM GRADIOMETER WITH agGPS-114/132 STEERING

  29. Standard Survey Acquisition Swath Spacing

  30. GPS Differential Corrections Coast Guard Beacon OmniStar (On shore only without special license) Racal (On shore only without special license) RTCM RTK Known Antenna and Satellite positions and frequencies

  31. Data Processing Software – Magmap 2000

  32. Software capabilities • Import G-858 magnetometer (1 or 2 sensors) • Convert GPS Lat / Long to UTM XY coordinates • Correct for GPS offset from Magnetometer sensor • Perform Spike filtering • Import G-858 or G-856 base station data • Merge Base Station data with survey Data • Export in Surfer or Geosoft format

  33. MagMap 2000 Destripping tool

  34. Surfer Software Capabilities • Windows based program for professional displays • Grid and contour G-858 data • Display sample locations on contour map • Various types of displays for interpretation • Export Windows Metafile and ASCII grid files for MagAID

  35. Surfer Displays – Ft. Ross

  36. Stanford Base Map

  37. Surfer 3 dimensional display

  38. Stanford shaded relief

  39. Stanford Magnetic Contour Map

  40. RAW DATA MANUAL SMOOTHING 3 POINT RUNNING AVERAGE MagPick – Filtering theory

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