Raw GPR data for: Alluvial dynamics of a formerly glaciated Rocky Mountain headwater valley, Colorado

This dataset includes raw common-offset ground-penetrating radar (GPR) lines crossing the South Fork River Valley, Colorado (please see GPR_Profile_Line_Map.png for a figure detailing the line names and locations). These GPR lines were merged in processing to generated the Profiles (1-4) presented in the manuscript. We used a Sensors and Software DVL and 100 MHz frequency antennas spaced 1 m apart, arranged perpendicular to the direction of travel, with a trace spacing of 0.25 m along a reel tape placed along the transect path. A single Emlid Reach RS2 GPS receiver with an accuracy of 2.5 m was mounted to the GPR frame and recorded the position of each trace. Ringing artifacts from a metal GPS mount occurred on initial transects but the mount was subsequently replaced by a plastic mount. Frequency filtering was unsuccessful at removing instrument noise without removing the real signal observed close to the ground surface. Over 1.5 km of common offset GPR data were collected along the transects. We conducted two common midpoint (CMP) surveys to estimate radar velocities in valley bottom sediments to improve the accuracy of the travel time to depth conversion of cross sectional radargrams. The CMP surveys used a 10 cm move out of each antenna between each trace. Sixty traces were collected in each CMP survey.