Repeat microgravity data from Mesilla Valley, New Mexico, 2016-2017
Dates
Publication Date
2017
Time Period
2016-01-19
Time Period
2016-04-14
Time Period
2016-06-28
Time Period
2017-01-31
Citation
Kennedy, J.R., Robertson, A.J., Carruth, R.L., and Rinehart, A.J., 2017, Repeat microgravity data from Mesilla Valley, New Mexico, 2016-2017: U.S. Geological Survey data release, https://doi.org/10.5066/F7BV7F3Q.
Summary
Note: this data release has been depecrated. Find the updated version here: https://doi.org/10.5066/P94SN60M. This dataset represents the network-adjusted results of relative- and absolute-gravity surveys in Mesilla and Las Cruces, New Mexico. Relative-gravity surveys were carried out using a Zero Length Spring, Inc. 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 [...]
This dataset represents the network-adjusted results of relative- and absolute-gravity surveys in Mesilla and Las Cruces, New Mexico. Relative-gravity surveys were carried out using a Zero Length Spring, Inc. 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 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 Gravnet (Hwang, C., Wang, C., Lee, L., 2002. Adjustment of relative gravity measurements using weighted and datum-free constraints. Comput. Geosci. 28, 1005–1015). Additional information about the network adjustment is provided under Data Quality. Data pre- and post-processing were carried out using GSadjust (https://github.com/jkennedy-usgs/GSadjust).
Data are provided in shapefile and tabular (csv) format. The shapefile contains one entry per station per date. The csv file contains one row per station, with multiple columns for gravity, and gravity change converted to water-storage change.
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Mesilla_AdjustedGravity_2016-2017_tabular.xml Original FGDC Metadata
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Purpose
Data were collected to evaluate aquifer-storage change. Using the horizontal infinite-slab approximation, gravity data (in units of acceleration, for example, m/s^2), are converted to a thickness of free-standing water, regardless of the depth to or porosity of the interval at which storage-change occurs. Data are not corrected for soil-moisture variation (that is, estimated storage changes include all storage change between the land surface and the aquifer).
