Maine Onshore Complete Bouguer Gravity Anomaly Data

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The gravity station data (18,461 records) were compiled by the U. S. Geological Survey. This data base was received on February 23, 1993. Principal gravity parameters include observed gravity, Complete Bouguer Gravity anomalies and Free-air anomalies. The observed gravity values are believed referenced to the International Gravity Standardization Net 1971 (IGSN 71). It is also believed the gravity anomaly computation uses the Geodetic Reference System 1967 (GRS 67) theoretical gravity formula.

NGS Absolute Gravity Data

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The NGS Absolute Gravity data (78 stations) was received in July 1993. Principal gravity parameters include Gravity Value, Uncertainty, and Vertical Gradient. The data are randomly spaced worldwide.

DNAG Gravity Data

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The Decade of North American Geology (DNAG) gravity grid values, spaced at 6 km, were used to produce the Gravity Anomaly Map of North America (1987; scale 1:5,000,000). Considerable caution should be exercised when using these gridded data in regions of sparse coverage (for example, deep oceanic areas). The spatial distribution of the original data from which the grid was generated is shown on sheet 5 of the published map. Note: There are no gridded data values for Mexico.

Maine Bouguer Gravity Grid

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A 2 kilometer Bouguer anomaly grid for the state of Maine. Number of columns is 197 and number of rows is 292. The order of the data is from the lower left to the right and then up one row.

Interior Alaska Bouguer Gravity Anomaly

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A 1 kilometer Complete Bouguer Anomaly gravity grid of interior Alaska. All grid cells within the rectangular data area (from 61 to 66 degrees North latitude and from 144 to 159 degrees West longitude) have interpolated data values. Number of columns is 850 and number of rows is 600. The order of the data is from the lower left to the right and then up one row.

Andes 1997 Gravity Data

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The Central Andes gravity data (6,151 records) were compiled by Professor Gotze and the MIGRA Group. This data base was received in April, 1997. Principal gravity parameters include Free-air Anomalies and Bouguer Anomalies (terrain and mass corrected). The gravity station data have been adjusted to the International Gravity Standardization Net 1971 (IGSN 71). The gravity anomaly computation uses the Geodetic Reference System 1967 (GRS 67) theoretical gravity formula. The data are randomly distributed within the area bounded by 64 - 71 degrees West and 20 - 29 degrees South in the Central Andes of South America.

Interior Alaska Bouguer Gravity Anomaly

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A 1 kilometer Complete Bouguer Anomaly gravity grid of interior Alaska. Only those grid cells within 10 kilometers of a gravity data point have gravity values. Number of columns is 850 and number of rows is 600. The order of the data is from the lower left to the right and then up one row.

Gravity Data for Minnesota

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The gravity station data (55,907 records) were gathered by various governmental organizations (and academia) using a variety of methods. This data base was received in March 1993. Principal gravity parameters include Free-air Anomalies and Simple Bouguer Anomalies (no terrain correction applied). The observed gravity values are referenced to the International Gravity Standardization Net 1971 (IGSN 71) and the gravity anomaly computation uses the Geodetic Reference System 1967 (GRS 67) theoretical gravity formula. The spatial resolution of the data is randomly distributed within the boundaries of Minnesota.

Utah Bouguer Gravity Grid

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A 2.5 kilometer Bouguer anomaly grid for the state of Utah. Number of columns is 196 and number of rows is 245. The order of the data is from the lower left to the right and then up one row.

SEG US Bouguer Gravity Anomaly Grid

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The SEG gravity data are the product of the ad hoc Gravity Anomaly Map (GAM) Committee, sponsored by the Society of Exploration Geophysicists (SEG) and the U.S. Geological Survey (USGS). The committee co-chairmen were Paul L. Lyons and Norbert W. O'Hara.