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Geoelectric and Seismic Data acquired in the Precambrian Granite Gravel Aquifer, Llano Uplift, Central Texas, May 2017 - August 2018

Metadata Updated: July 6, 2024

This data release contains geophysical data and well and borehole driller's logs acquired at a small field site in the Llano Uplift of central Texas. The field site is underlain by the unconfined Precambrian Granite Gravel aquifer and the Precambrian Town Mountain Granite bedrock from which the Granite Gravel Aquifer was derived through chemical and mechanical weathering. The data set consists of five types of data in the quantities indicated: (1) 1 time-domain electromagnetic sounding, (2) 441 self-potential measurements, (3) 2 electrical resistivity tomography profiles, (4) 2 seismic refraction tomography profiles, and (5) 4 driller's logs (obtained from 2 wells and 2 shallow boreholes). The data were collected primarily from within a 100-meter (m) by 100-m survey area to characterize the geoelectric and seismic properties of the Granite Gravel Aquifer. Emphasis was placed upon evaluating the successes of time-domain electromagnetic sounding and seismic refraction tomography to map the water-table and bedrock depths, respectively, in the shallow subsurface. This emphasis provided the catalyst for a more extensive geophysical characterization of the aquifer to provide enough contrasting data to reduce uncertainty in the interpretations made from the electromagnetic and seismic data. Geophysical properties of the aquifer were measured and correlated to driller's logs from local wells and boreholes to interpret the water-table and bedrock depths beneath the survey area. Correlations between geophysical data and driller's logs enabled a hydrogeophysical characterization of the Granite Gravel Aquifer and Town Mountain Granite beneath the survey area at the field site.

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 July 6, 2024

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date July 6, 2024
Publisher U.S. Geological Survey
Identifier USGS:59f0ad86e4b0220bbd9ade2d
Data Last Modified 20220824
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 7996be59-202f-4478-90d8-be8b3f08782b
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -98.384813,30.648555,-98.381485,30.650761
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash d9ef2ab292f991eee4354b8f1f234164c4dd66d5da5f83875826bbe570190621
Source Schema Version 1.1
Spatial {"type": "Polygon", "coordinates": -98.384813, 30.648555, -98.384813, 30.650761, -98.381485, 30.650761, -98.381485, 30.648555, -98.384813, 30.648555}

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