1. 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
Slide

2. Geometrics, Inc. Premier Manufacturer of Land Magnetometers
Slide

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 Magnetic Field – Solar effects
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

18. Sensor Dead Zone Diagram

19. Sensor Diagrams - CSAZ

20. Sensor Dead Zone – 0 Degree Tilt

21. Sensor Dead Zone – 45 Degree Tilt

22. Results of Survey profile width

23. Anomaly patterns as a result of Inclination

24. Anomaly width versus depth

25. Depth estimate

26. Nomogram

27. Anomalies of common objects

28. Vertical Gradient Applications

29. Wearing the G-858

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

31. Standard Survey Acquisition
Swath Spacing

32. 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

33. Data Processing Software – Magmap 2000

34. 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

35. MagMap 2000 Destripping tool

36. 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

37. Surfer Displays – Ft. Ross

38. Stanford Base Map

39. Surfer 3 dimensional display

40. Stanford shaded relief

41. Stanford Magnetic Contour Map

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