|-0.3402823E+39||areas for which no data are available in the grid|
|Range of values|
The compilation of onshore data consisted of nearly one million Bouguer gravity anomaly values computed by using a reduction density of 2.67 grams per cubic centimeter. The offshore data consisted of approximately 800,000 free-air gravity anomaly values. The isostatic calculation was produced from these data USGS employees: Simpson and Jachens
Isostatic residual gravity anomaly maps are produced by subtracting long-wavelength anomalies produced by masses deep within the crust or mantle from the Bouguer anomaly map. The long-wavelength anomalies are assumed to result from isostatic compensation of topographic loads. Isostatic residual gravity anomaly maps therefore reveal more clearly than Bouguer gravity anomaly maps the density distributions within the upper crust that are of interest in many geologic and tectonic studies.
Are there legal restrictions on access or use of the data?
The USGS has made every effort to verify the veracity of this information, but is not liable for any inaccuracies.
|Data format:||Gridded gravity anomaly data in format ArcInfo export (version 7.x) Arc-Info grid format Size: 3.5|
|Data format:||Gridded gravity anomaly data in format GeoTiff (version 6)|
|Data format:||Isostatic gravity anomaly in format OGC WMS (version 1.3.0)|