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