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Magnetic Method

The magnetic method uses a magnetometer to measure the earth's magnetic field strength in gamma or nanotesla units. Local variations (anomalies) in the field strength reflect the spatial variation of ferromagnetic materials in the subsurface.

Magnetic surveys are used for locating buried steel drums and tanks, and geologic features such as mineralized bedrock fractures, igneous intrusions, and ore bodies.

Magetic Profile

A total magnetic field and magnetic gradient profile over a buried drain pipe and tank


OFM 57, Magnetic Anomaly Map of New Jersey and Vicinity. Download PDF (349KB)

NJGS DIGITAL GEODATA SERIES DGS04-3 Magnetic Anomalies of New Jersey

For more information on the magnetic method, please refer to Chapter 8 (Geophysical Techniques) of the NJDEP's Field Sampling Procedures Manual, 2005.

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Department of Environmental Protection
Geological and Water Survey
P. O. Box 420
Mail Code:29-01
Trenton, NJ 08625-0420

Phone: (609) 292-1185
FAX: (609) 633-1004