Electrical resistivity tomography (ERT) data collected near Summerset, South Dakota, between July 28 and August 5, 2025

The U.S. Geological Survey, in cooperation with the City of Summerset, South Dakota, performed electrical resistivity tomography (ERT) surveys between July 28 and August 5, 2025. ERT data were collected using an Advanced Geosciences Incorporated SuperSting with 2 passive cables with 14 electrodes per cable. In total, ERT data were collected along 13 transects using 2 passive cables and electrodes spacings of either 1, 2, or 3 meters. Transect lengths varied from 27 to 81 meters. Real time kinematic (RTK) surveys were completed before ERT data collection to obtain latitude, longitude, and elevation of each electrode location. Elevation data collected during RTK surveys were uploaded to EarthImager2D software from Advanced Geosciences, Inc. (https://www.agiusa.com/agi-earthimager-2d) along with apparent resistivity data for inversion. EarthImager2D software allows users to remove noisy measurements either automatically or manually and invert apparent resistivity data to generate two-dimensional profiles of electrical resistivity. Inverted resistivity profiles were generated for all 13 transects. The unprocessed and processed data for each transect are provided as zipped folders (.zip) and annotated accordingly in the metadata. RTK data are provided in a comma separated values (.csv) file.