{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Katie (KT) M. Hulsey", "hasEmail": "mailto:khulsey@usgs.gov"}, "description": "Horizontal-to-Vertical Spectral Ratio (HVSR) passive seismic soundings were collected by the U.S. Geological Survey (USGS) at 27 locations throughout the Illinois River Basin (IRB) in October and November 2022. The USGS collected these data to characterize depth to bedrock in support of the USGS Next Generation Water Observing System (NGWOS) IRB program and for comparison to Airborne Electromagnetic and magnetic survey data. Data were collected by two teams, each equipped with either two Tromino Blu seismometers (https://moho.world/en/tromino/) or one Tromino Blu seismometer and one SmartSolo IGU-16HR seismometer (https://smartsolo.com/). Two soundings were collected simultaneously at each measurement point by instruments positioned near each other. Tromino data were processed using MOHO Grilla HVSR software (https://moho.world/en/moho/), and SmartSolo data were processed using Python functions.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P13WHWZR", "description": "Landing page for access to the data", "format": "XML", "mediaType": "application/http", "title": "Digital Data"}, {"@type": "dcat:Distribution", "description": "The metadata original format", "downloadURL": "https://data.usgs.gov/datacatalog/metadata/USGS.66840f0bd34e0f592272b400.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_66840f0bd34e0f592272b400", "keyword": ["Aquifer characterization", "Geophysics", "HVSR", "Horizontal-to-vertical spectral ratio", "Illinois", "Illinois River basin", "NGWOS", "Passive seismic", "SmartSolo", "Tromino", "USGS:66840f0bd34e0f592272b400", "geoscientificInformation"], "modified": "2025-09-23T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-91.0000, 39.0000, -87.5000, 42.5000", "theme": ["geospatial"], "title": "Horizontal-to-Vertical Spectral Ratio (HVSR) passive seismic data collected at 27 sites for the Next Generation Water Observing System (NGWOS) Illinois River Basin (IRB) Program, 2022"}