{"accessLevel": "public", "bureauCode": ["010:12"], "contactPoint": {"@type": "vcard:Contact", "fn": "Joanne H Chan", "hasEmail": "mailto:jchan@usgs.gov"}, "description": "In April 2017, the U.S. Geological Survey acquired high resolution P- and S-wave seismic data across the suspected trace of the West Napa Fault zone in St. Helena, California. We acquired seismic reflection, refraction, and guided-wave data along a 215-m-long profile across the expected trend of the West Napa Fault zone.  To acquire the reflection and refraction data, we co-located shots and geophones, spaced every 2 m along the profile.  We used 109 SercelTM L40A P-wave (40-Hz vertical-component) geophones with a sensitivity of 22.34 volts/meter/second to record 108 P-wave shots, and 109 SercelTM L28-LBH S-wave (4.5-Hz horizontal-component) geophones with a sensitivity of 31.3 volts/meter/second to record 108 S-wave shots. We generated P-wave data using one of two active sources depending on site accessibility: a 226-kg accelerated weight drop (AWD) and a 3.5-kg sledgehammer and steel plate combination. S-wave sources were generated by horizontally striking an aluminum block with a 3.5-kg sledgehammer. We acquired fault zone guided wave data by generating P- (AWD) and S-wave (angle AWD) energy approximately 225 m north of the P- and S-wave recording arrays. All data were recorded using two 60-channel Geometrics Stratavisor NX-60TM seismographs with a 24-bit analog-to-digital converter with a roll-along descaling factor (Subcommittee of the SEG Engineering and Groundwater Geophysics Committee, 1990); the seismographs were connected to the P- and S-wave geophones via refraction cables. Each shot was recorded for two seconds, with data recording starting 100 ms before the actual time of the shot.  Data were recorded at a sampling rate of 0.5 ms, or 2000 samples per second. This report provides the metadata needed to utilize the seismic data. \nReference:  \nSubcommittee of the SEG Engineering and Groundwater Geophysics Committee, Pullan, \nS. E., Chairman, 1990, Recommended standard for seismic (/radar) data files in the \npersonal computer environment: Geophysics, vol. 55, no. 9, p. 1260-1271.", "distribution": [{"@type": "dcat:Distribution", "accessURL": "https://doi.org/10.5066/P9LKXZKP", "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.5ad94505e4b0e2c2dd27aa1a.xml", "format": "XML", "mediaType": "text/xml", "title": "Original Metadata"}], "identifier": "http://datainventory.doi.gov/id/dataset/USGS_5ad94505e4b0e2c2dd27aa1a", "keyword": ["USGS:5ad94505e4b0e2c2dd27aa1a", "earthquakes", "faulting (geologic)", "hazards", "seismic reflection methods", "seismic refraction methods", "seismology"], "modified": "2020-08-27T00:00:00Z", "publisher": {"@type": "org:Organization", "name": "U.S. Geological Survey"}, "spatial": "-122.53153107168, 38.420005674318, -122.24039337638, 38.634873230994", "theme": ["geospatial"], "title": "2017 seismic imaging of the West Napa Fault Zone, St. Helena, California"}