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Field inventory and monitoring
Repeated observation or sampling at a site, on a scheduled or event basis, for study and analysis. In general, this category excludes sampling programs in which materials are obtained in the field and brought back to a laboratory for study and analysis.
This category is also used for baseline characterization, field monitoring, field observation, inventory, reconnaissance, and river discharge monitoring.
Subtopics:
Acoustic methods (1 items)
Borehole logging (5 items)
Electromagnetic surveying (16 items)
Seismic methods (5 items)
Gravimeter measurement (84 items)
Magnetometer measurement (16 items)



Results 1 - 10 of 120 listed by similarity [list alphabetically]
Field estimates of gravity terrain corrections and Y2K-compatible method to convert from gravity readings with multiple base stations to tide- and long-term drift-corrected observations [New Window]
Fortran code to facilitate correction and interpretation of gravity observations
FD_BH: A program for simulating electromagnetic waves from a borehole antenna [New Window]
Software for simulating electromagnetic waves from a borehole antenna
Field demonstrations of five geophysical methods that could be used to characterize deposits of alluvial aggregate [New Window]
Data from seismic reflection and refraction, electromagnetic sounding, and resistivity profiling in a study area in Indiana. Exact location is not provided.
PDF Geophysical framework of the southwestern Nevada volcanic field and hydrogeologic implications [New Window]
Report describing detailed interpretation of geophysical survey data to draw inferences about subsurface geologic features and likely consequences for the hydrogeologic system.
PDF Introduction to potential fields: gravity [New Window]
Explanation of the Earth's gravitational field, emphasizing how USGS scientists measure gravity and portray these measurements on maps. Explains terminology of gravity anomaly maps and their relationship to the rock types and other geologic features.
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.
Pick_Sw: A program for interactive picking of S-wave data, version 2.00 [New Window]
Software for interactively picking of S-wave data
Preliminary isostatic gravity map of the Sonoma Volcanic field and vicinity, Sonoma and Napa counties, California [New Window]
Gravity station data from three separate surveys
PDF Preliminary potential-field constraints on the geometry of the San Fernando basin, southern California [New Window]
Results of mathematical modeling of gravity and magnetic anomaly data to infer the geologic structure of the area
Principal facts for gravity stations and physical property measurements in the Lake Mead 30'x60' quadrangle, Nevada and Arizona [New Window]
Gravity data were collected in support of geologic mapping of the quadrangle. In addition, older gravity data were reprocessed for consistency and included, as well as 250 measurements of density and magnetic susceptibility.
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