Matlab code for Figures 5 and 7

USGS Southwest Gravity Program

The U.S. Geological Survey Southwest Gravity Program aims to provide high-precision time-lapse gravity (repeat microgravity) data for hydrologic studies in the southwestern US. Recent projects include monitoring recharge underneath ephemeral-stream channels, monitoring aquifer-storage change in unconfined and compressible aquifers, measuring preferential storage change at an artificial-recharge facility, and estimating specific yield through the correlation of gravity and water-level change in wells. Projects range in scale from the site-specific (individual recharge basins) to alluvial basin (e.g., the Tucson and Avra Valley groundwater basins). Southwest Gravity Program Data Releases Fact sheet about hydrologic...

Tags: Geophysics, Gravity, Hydrology, Southwest Gravity Program, Time-lapse data

Drift corrections

These plots show the daily modeled drift corretion.

Tides

Estimated Earth tide and ocean loading (combined), from a local continuous (superconducting) gravimeter.

Observed data

These files are in the format required for Gravnet (Hwang, 2002), except the date in the "fix" files should be removed. Time is UTC. The default Burris Earth tide model was replaced with a local combined tide and ocean loading model. dg: tide and drift-corrected gravity differences fix: absolute gravity values, transferred from the A-10 measurement height (71.7 cm) to the gravimeter location using a site-specific gradient.