The gravity network data (7,298 records) were gathered by various governmental organizations (and academia) using a variety of methods.

This dataset contains absolute-gravity data collected by the USGS Southwest Gravity Program, a collaborative effort of the Arizona, California, and New Mexico Water Science Centers to monitor and model groundwater-storage change. Data were collected following the methods in "Procedures for Field Data Collection, Processing, Quality Assurance and Quality Control, and Archiving of Relative and Absolute-Gravity Surveys", U.S. Geological Survey Techniques and Methods book 2, chapter D4 (https://pubs.er.usgs.gov/publication/tm2D4). All data are reviewed and approved. Additional data, including network-adjusted relative- and absolute-gravity data, may be available in ScienceBase Data Releases (https://www.sciencebase.gov/catalog/item/5910bebae4b0e541a03ac8f8). Last update: 2022-07-08

This dataset represents the network-adjusted results of relative- and absolute-gravity surveys. Relative-gravity surveys were carried out using a Zero Length Spring, Inc. Burris relative-gravity meter. The effect of solid Earth tides and ocean loading were removed from the data. Instrument drift was removed by evaluating gravity change during repeated measurements at one or more base stations. Absolute-gravity surveys were carried out using a Micro-g LaCoste, Inc. A-10 absolute-gravity meter. Vertical gradients between the different measuring heights of the absolute- and relative-gravity meters were measured using a relative-gravity meter and tripod and were used to correlate the measurements between the two instruments. Relative-gravity differences and absolute-gravity data were combined using a least-squares network adjustment as implemented in the software GSadjust (https://github.com/jkennedy-usgs/sgp-gsadjust). Additional information about the network adjustment is provided under Data Quality. Version 2.0 of this dataset included additional data from seven surveys carried out in 2017-2019. Version 3.0 of this dataset included additional data from four additional surveys carried out in 2020-2021. Gravity values for the Dec. 2018 through Dec. 2019 surveys are different than version 2.0 because of updated laser-drift corrections for the absolute-gravity measurements. As of 2021, observed absolute-gravity values are also available in the Southwest Gravity Program Absolute Gravity Database (https://doi.org/10.5066/P984HN6J). Gravity values at all stations in version 3.0 of this data release are reported at land-surface elevation. Previously, absolute-gravity values at stations not included in the network adjustment (HRUN, MSDL, NEST, NMGS, SVIS, WBLF, WGHT, and WTF1) were reported at 100 cm height. Version 4.0 of this dataset includes additional data from three surveys carried out in 2023-2025. No data were collected in 2022. Beginning in 2023, surveys were carried out once per year (from 2016 to 2021, surveys were carried out three times per year). Additional stations were added to the network in 2023. Data are provided in tabular (csv) format. The file contains one row per station, with multiple columns for gravity and gravity standard deviation. Storage change in meters of water can be calculated from gravity change using the Bouguer infinite slab approximation, whereby [change in gravity, in microGal]/41.9 = meters of water. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. First posted - September 22, 2017 Revised - September 9, 2020, ver. 2.0 Revised - March 8, 2023, ver. 3.0 Revised - June 27, 2025, ver. 4.0

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 deviat ...

This dataset represents the network-adjusted results of relative- and absolute-gravity surveys performed from 2019 to 2023 in and near the City of Rio Rancho, New Mexico. Relative surveys were conducted using a Zero Length Spring, Inc. Burris relative-gravity meter. Absolute-gravity surveys were conducted using a Micro-g LaCoste, Inc. A-10 absolute-gravity meter. The effect of solid Earth tides and ocean loading were removed from the data prior to network adjustment. Non-linear instrument drift was removed by evaluating gravity change during repeated measurements at one or more base stations. Vertical gradients between the relative- and absolute-gravity meters were measured at each station where both types of measurement were collected to correlate the measurements of the two instruments. Vertical gradients were measured using a relative-gravity meter and tripod set to the height of the absolute-gravity meter. Relative-gravity differences and absolute-gravity data were combined us ...

The IAGBN aims to distribute gravity points worldwide and construct a network on which gravity observation is based. There are two kinds of points: A is a point set up in regions with stable crustal structure, and B is a point set up in regions where crustal activity is expected. Syowa Station in Antarctica was among the 36 A points. McMurdo Station of the U.S. is the only point in Antarctica other than Syowa Station that is classified as A. Introduced GSI in 1980, the upcast-type absolute gravity meter (GA60) generally called the Sakuma type, was used in this survey. The 36th JARE (1994) conducted observation using FG5 that the GSI introduced in 1992. Because FG5 measures gravity in a free-fall system, it is characterized by the ability to conduct automatic continuous measurement and allow for many measurements.