Applications
ENVI-MAG Manual B- i
Table of Contents
Table of Contents
Magnetic surveying overview........................................ B1-1
Introduction ...................................................................... B1-1
Basic magnetic theory .................................................... B1-1
What is being measured?................................................. B1-1
Anomalies....................................................................... B1-3
Shape ...................................................................... B1-5
Amplitude ................................................................. B1-6
Variations in the Earth’s magnetic field ............................. B1-7
Diurnal variation ........................................................ B1-7
Micro-pulsations ....................................................... B1-8
Magnetic storms ...................................................... B1-9
Removing magnetic variations .................................. B1-10
Magnetic targets........................................................... B1-11
Induced and Remanent magnetism .................................. B1-12
Survey planning ............................................................... B2-1
Introduction ...................................................................... B2-1
Sampling intervals............................................................ B2-1
Line and Station spacing vs. Anomaly width....................... B2-2
Precision and Accuracy of surveys ................................ B2-3
Noise ............................................................................. B2-3
Tuning............................................................................. B2-4
Survey mode ................................................................... B2-4
WALKMAG................................................................ B2-4
Stop-and-Go ............................................................. B2-5
Gradiometer ............................................................. B2-6
Field observations ........................................................... B2-6
Grid layout and orientation ............................................. B2-7
Applications for
the ENVI-MAG
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