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.
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.
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.
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.
Coordinated studies of the effect of historical mining for mercury, origin and composition of metals in groundwaters and surface waters, history of volcanic and intrusive activity, and the complex geological history of this area.
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.
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.
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.
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.