Mineral Resources On-Line Spatial Data
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.
This category is also used for geomagnetic field, geomagnetics, geomagnetism, magnetic field, and magnetosphere.
- Magnetic anomaly map of North America [New Window]
- Airborne measurement of the earth's magnetic field over all of North America provides gridded data describing the magnetic anomaly caused by variations in earth materials and structure.
- 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.
- Compiling magnetic databases [New Window]
- Explains the process used to compile and analyze data from diverse magnetic surveys of an area to produce a consistent synoptic data set portraying the magnetic anomalies of the region.
- Aeromagnetic and gravity maps of the central Marysvale volcanic field, southwestern Utah [New Window]
- Maps (no data) depicting aeromagnetic and Bouguer gravity anomaly in the study area. Report discusses rock sample density and magnetic properties, but data are buried in PDF tables.
- Aeromagnetic, gravity anomaly, and derivative maps of the Craig and Dixon Entrance 1°x3° quadrangles of southeastern Alaska [New Window]
- A simplified geologic map, raw gravity and magnetic data, with derivative products including depth-to-source and rock densities, with limited interpretations of the underlying geology, structures, and mineral resources.
- Helicopter electromagnetic and magnetic survey maps and data, East Poplar oil field area, August 2004, Fort Peck Indian Reservation, northeastern Montana [New Window]
- Grids, line data, and imagery derived from them covering the small study area.
- Magnetic and gravity anomaly maps of West Virginia [New Window]
- Aeromagnetic surveys of West Virginia, merged to form seamless grids across the state. Gravity anomaly data are provided as well.
- A helicopter-borne magnetic survey over Dixie Valley geothermal field, Nevada [New Window]
- Gridded data from helicopter study of shallow geologic structures
- A preliminary full spectrum magnetic anomaly grid of the United States with improved long wavelengths for studying continental dynamics [New Window]
- The long-wavelength (50-2,500 km) content of the regional magnetic anomaly compilation was improved by utilizing a nearly homogeneous a nearly homogeneous set of NURE magnetic surveys flown from 1975 to 1981
- Aeromagnetic and aeromagnetic-based geologic maps of the Coastal Belt, Franciscan Complex, northern California [New Window]
- New aeromagnetic point observation data with grids as well