L06-page15 - • Vertical gradient is a maximum of about...

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15 • Essentially a correction for variations in field with latitude and longitude. • If survey is conducted over a large area, correct for changing magnetic field relative to location: • Usually use an IGRF map • Between 30 and 60 degrees north or south (North-South gradient is about 2 to 5 nT/km – East-west grad is 0 to 2 nT/km) Normal Field Correction
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Unformatted text preview: • Vertical gradient is a maximum of about 0.03nT/m at poles and 0.01 nT/m at equator. • Elevation correction • Generally not required for ground surveys • Only in airborne when large elevation changes experienced • Terrain correction • Only comes into play near the base of steep slopes of high k material Elevation and Terrain Corrections...
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This note was uploaded on 01/07/2012 for the course PHYSICS 384 taught by Professor Wei during the Spring '09 term at SUNY Stony Brook.

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