Annie E. Tucker Yeonju Kim Lijing Wang Eric A. White Dave M. Rey Fritz J. Jean Samuel Pierce Martin A. Briggs 20260331 csv, ascii, jpg, shapefile Reston, VA U. S. Geological Survey https://doi.org/10.5066/P1LGT6KX This data release documents seismic data collected immediately adjacent to beaver ponds and in their surrounding floodplain environments using active and passive seismic measurements at three sites. These sites are located in the University of Connecticut (UConn) Forest in Storrs, Connecticut; Fenton-Ruby Park in Willington, Connecticut; and in Gunnison County, Colorado. Horizontal-to-vertical spectral ratio (HVSR) measurements were acquired using three-component Tromino seismometers (MoHo, S.R.L.) at non-inundated locations during late summer 2025 (51 total HVSR points). Resonance frequencies were identified from Fourier spectra using GRILLA software (MoHo, S.R.L.). Active 1D Multichannel Analysis of Surface Waves (MASW) test data were collected to estimate 1D seismic shear-wave velocity (Vs) structure at the UConn Forest and Fenton-Ruby Park sites using GRILLA (2 total MASW points). We used literature estimates of Vs for the Gunnison County site. We then converted the resonance frequencies to sediment thickness (depth to bedrock) using a range of plausible sediment shear-wave velocities to demonstrate potential uses of the geophysical data. The average inferred bedrock depth for the UConn Forest was 10.6 +/- 0.8 m; Fenton-Ruby Park was 5.3 +/- 0.9 m; and Gunnison County was 18 +/- 1.9 m. The uncertainty of these example calculations is based on how distinct the HVSR resonance frequency response was, as evaluated automatically with GRILLA software. This work supports investigations of subsurface structure in beaver-influenced valley bottoms. The active and passive seismic data were collected for this study to characterize the depth to bedrock across the three beaver inhabited floodplain sites and to better understand the thickness of the gravel bed and the potential influence of that sediment thickness on the lateral and vertical exchange of groundwater with surface water. 20250729 20250922 ground condition Complete Irregular -106.6203 -72.2245 41.8997 38.9077 ISO 19115 Topic Category geoscientificInformation inlandWaters environment USGS Thesaurus geophysics hydrology groundwater and surface-water interaction hydrogeology regolith thickness HVSR beaver ponds MASW USGS Metadata Identifier USGS:695c132cd4be0212308a7f32 Common geographic areas Connecticut Colorado Connecticut River Basin Gunnison County UConn Forest Fenton River Basin No access constraints. Please see 'Distribution Information' for details. These data are marked with a Creative Common CC0 1.0 Universal License. These data are in the public domain and do not have any use constraints. Users are advised to read the dataset's metadata thoroughly to understand appropriate use and data limitations. Annie E. Tucker USGS - WATER Contractor mailing and physical

NASA AMES-Moffett Field, Moffett Field - Building 19

Moffett Field CA 94035 860-487-7402 aetucker@usgs.gov Data includes raw instrument files, with these data being processed to varied degrees, depending on the specific objectives of the work. These details are all described in the local readme files for each method. Data were reviewed for consistency. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record and local readme file for additional details. No formal positional accuracy tests were conducted. No formal positional accuracy tests were conducted. Data were collected in a variety of ways depending on the method and objective, as described in the .xml metadata file and local readme files for each child item and method. 2025 USA Point Point .001 .001 Decimal degrees WGS_1984 WGS_1984 6378137.0 298.257222101 GS Science Base U.S. Geological Survey mailing address

Denver Federal Center

Building 810

Mail Stop 302

Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also may contain copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Although these data have been processed successfully on a computer system at the USGS, no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Digital Data https://doi.org/10.5066/P1LGT6KX None 20260331 Annie E. Tucker USGS - WATER Contractor mailing and physical

NASA AMES-Moffett Field, Moffett Field - Building 19

Moffett Field CA 94035 860-487-7402 aetucker@usgs.gov FGDC Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998