Skip Links

USGS - science for a changing world

Fact Sheet 236-95

Introduction to Potential Fields: Magnetics

Link to Report PDF (39 kB)Download Publication
FS 236-95
PDF (39 kB)
Right-Click to 'Save As' or 'Download'

Aeromagnetic anomaly maps show variations in the Earth’s magnetic field that are caused mainly by magnetic minerals in crustal rocks. These anomalies vary with amount and type of magnetic material and the geometry and depth of the magnetic body. Igneous and metamorphic rocks frequently are magnetic enough to cause anomalies, whereas sedimentary rocks commonly are nonmagnetic. Aeromagnetic anomaly maps are important tools for mapping surficial and buried rocks, for determining geologic structure, and for discovering some types of mineral deposits. Regional geologic features may become evident after individual aeromagnetic surveys are compiled and plotted at the same scale in a consistent way.


Version 1.0

Posted 1998

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Acrobat Reader or similar software is required to view it. Download the latest version of Acrobat Reader, free of charge or go to for free tools that allow visually impaired users to read PDF files.

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
URL: http:// /fs/fs-0236-95/index.html
Page Contact Information: Contact USGS
Page Last Modified: Tuesday, 29-Nov-2016 17:52:56 EST