Parent Layer: Gravity Contours

Name: Tooele_CompleteBouguerGravityAnomalyPoints

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Type: Feature Layer

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Description: Explanation of PACES Gravity DatasetA set of gravity data is provided for the Dugway Proving Ground map area that was obtained from the Pan American Center for Earth and Environmental Sciences (PACES) at the University of Texas El Paso. We accessed this data from their website in 2012 (PACES, 2012). This is a compilation of data provided from various sources to PACES. Gravity measurement locations are indicated as points. The gravity measurements were adjusted to obtain Bouguer gravity anomalies. The map presents the Complete Bouguer gravity anomaly (CBGA) which is the gravity field anomaly after accounting for variations due to elevation, terrain and latitude; interpolated using a 5 km grid in order to average out inherent, yet minute, differences in the PACES gravity data and contoured at an interval of 1 milliGal (mGal). Local spatial variations in the CBGA field (after correcting for deep crustal structure) reflect the distribution of densities in the mid- to upper crust. Densities often can be related to rock type, and abrupt spatial changes in density commonly mark lithologic or structural boundaries. Lower gravity anomalies generally reflect less dense valley fill deposits (mass deficiency), while higher anomalies reflect higher density pre-Cenozoic rocks (mass excess) exposed within mountain ranges of the map area.

Copyright Text: Pan American Center for Earth and Environmental Sciences (PACES) at the University of Texas El Paso. PACES has played a significant role in the compilation of gravity data in southwestern North America. This effort has been conducted in close cooperation with the U. S. Geological Survey, the National Geospatial-Intelligence Agency (formerly the National Image and Mapping Agency), National Oceanic and Atmospheric Administration, industry and academic colleagues. Together, we have developed the GeoNet gravity database portal that provides access to our new database for the U. S. The U. S. Geological Survey Open File report that describes this effort is available at this link: Open-File Report 02-463. The version now available is a major update to existing databases and is now also terrain corrected. This effort is also a key part of our NSF-supported projects to develop a geoscience cyberinfrastructure (GEON and SWGeoNet), and also features a tutorial "Getting Started: Using and Understanding Gravity Data". The new terrain corrected United States gravity database is available through the GeoNet link below. The terrain corrections were calculated by Mike Webring of the U. S. Geological Survey using a digital elevation model and a technique based on the approach of Donald Plouff. The reduction of these data has been updated with modern geodetic datums and a higher precision digital elevation model. In the present version, latitude and longitude values are referenced to NAD83 (North American Datum 83; horizontal datum) and elevation values in meter are referenced to NGVD88 (Vertical datum).

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  Label: Complete Bouguer Gravity Anomaly
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Fields:

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