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Gravity Change from 2014 to 2015, Sierra Vista Subwatershed, Upper San Pedro Basin, Arizona

Metadata Updated: October 29, 2023

Relative-gravity data were collected at 58 stations over ten days between May 27, 2015 and June 25, 2015 using a Zero Length Spring, Inc. Burris relative gravity meter (mention of a particular trade name does not imply endorsement by the U.S. Governement). In total, 179 relative-gravity differences were observed. Relative-gravity-meter drift was removed from the observations by modeling drift as a continuous function of time (Kennedy, 2015; Kennedy and Ferré, 2015). Absolute-gravity data were collected at 14 stations during the week of May 18–22, 2015 using a Micro-g Lacoste, Inc. A-10 absolute gravity meter. Network adjustment was performed using Gravnet software (Hwang, 2002) to provide representative station values as of June 1, 2015. During the adjustment, an iterative procedure was used to identify bad relative-gravity observations as those with high residuals (the difference between the observed value and the network-adjustment-predicted values). The a priori standard deviation of the gravity differences was estimated by summing in quadrature the standard deviation from several samples collected during each occupation; this estimate was revised upward by a factor of 3 based on the a posteriori variance of unit weight and Chi-square test statistic. In total, 16 out of 179 observations were excluded from the adjustment. The residuals are approximately normally distributed with standard deviation of 4.1 µGal. Also included are 2014 values from Kennedy (2015), and the change in gravity from 2014 to 2015 is calculated.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023
Publisher U.S. Geological Survey
Identifier USGS:56895bfce4b0e7594ee76499
Data Last Modified 20200807
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id af2c9040-2461-4726-9e4b-fb3e70ef294a
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -110.34232,31.38844,-110.12208,31.6091
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash 029a0cc68b33fb37f6b819f4c490b73176728ce44e62dca2896bdebf3f93e57a
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -110.34232, 31.38844, -110.34232, 31.6091, -110.12208, 31.6091, -110.12208, 31.38844, -110.34232, 31.38844}

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