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Magnetic field (earth)
The magnetic region surrounding earth. It is generated by the dipolar characteristic of earth's core whereby earth itself acts as a great spherical magnet with poles near, but not exactly at, the North and South poles.
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Magnetic anomaly maps (8 items)
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Results 1 - 14 of 14 listed by similarity [list alphabetically]
PDF Monitoring the Earth's dynamic magnetic field [New Window]
Describes the reasons why USGS monitors Earth's magnetic field and the history of that monitoring effort.
National Geomagnetism Program [New Window]
Overview of USGS programs related to geomagnetism including observatories, data, program services, links to models, charts, and movies, program contacts, Intermagnet, Geomag, publications, and bibliographies.
Magnetic and gravity anomaly maps of West Virginia [New Window]
Colored map in two parts and text in PDF files requiring Adobe Acrobat Reader 3.0 to view.
Geomagnetic charts [New Window]
Links to charts of the Earth's magnetic field in different projections showing declination, inclination, and total, horizontal and vertical intensities plus references and note on limitations.
Geomagnetic models [New Window]
Description of magnetic models with link to on-line calculation, freeware calculator (DOS and Windows), descriptions of model types, and references.
PDF Introduction to potential fields: Magnetics [New Window]
Explanation of the Earth's magnetic field and how USGS measures it. Defines magnetic anomaly, induced and remanent magnetism in rocks, and describes magnetic anomaly maps.
Washington aeromagnetic maps and data [New Window]
Colored geomagnetic and gravity maps and related data and graphical plots for the state of Washington.
An interpretation of the 1977 Airborne Electromagnetic (AEM) survey, Fort Huachuca vicinity, Cochise County, Arizona [New Window]
Complex report on the interpretation of aeromagnetic data to study hydrogeology of the San Pedro basin, Cochise County, Arizona determining geologic structure, basin fill and depth to water. Online version of a CD-ROM publication.
Menlo Park Rock Magnetics Laboratory [New Window]
Description of the work on paleomagnetism at the USGS Rock Magnetics Laboratory in Menlo Park, California with an overview of geomagnetic polar reversals, paleosecular variation, intensity, magnetic susceptibility, and rock magnetism analysis.
Teacher's guide to the San Francisco Bay area geophysics maps (U.S. Geological Survey GP-1006 and GP-1007) [New Window]
This publication (Open-File Report 95-479) is a teacher's guide to two U.S. Geological Survey maps that show gravity and magnetic data in contour form superimposed on a LANDSAT satellite image of the San Francisco Bay area.
Coastal and Marine Geology (CMG) InfoBank [New Window]
Access to InfoBank, an online data catalog, to browse or retrieve coastal and marine geology program information, images, and data on gravity, bathymetry, seismic activity, magnetics, samples, facilities, cruises and equipment.
Geophysical products [New Window]
Links to products of magnetic, gravity, magnetotelluric, and multi-discipline reports and surveys of regions in the U.S. and Antarctica plus geophysical software tools. Some products are in PDF format.
Paleomagnetism analyses [New Window]
Links to laboratory capabilities within the USGS for paleomagnetism and paleomagnetic and rock magnetic procedures for dating and determination of magnetic direction and polarity in samples with links to techniques, equipment, and contacts.
Western Region geophysical investigations by the Geophysical Unit of Menlo Park, Calif. (GUMP) [New Window]
Overview of the research group Geophysical Unit of Menlo Park (GUMP) with links to studies, models, and maps on gravity and geomagnetism in Nevada, California, Oregon, Washington and the U.S.


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