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"name": "Chan, Joanne H.",
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"name": "Catchings, Rufus D.",
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{
"name": "Goldman, Mark R.",
"nameType": "Personal",
"givenName": "Mark R.",
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},
{
"name": "Criley, Coyn J.",
"nameType": "Personal",
"givenName": "Coyn J.",
"familyName": "Criley",
"affiliation": [],
"nameIdentifiers": []
},
{
"name": "Sickler, Robert R.",
"nameType": "Personal",
"givenName": "Robert R.",
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{
"name": "DeLong, Steve B.",
"nameType": "Personal",
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],
"titles": [
{
"title": "2017 seismic imaging of the West Napa Fault Zone, St. Helena, California"
}
],
"publisher": "U.S. Geological Survey",
"container": {},
"publicationYear": 2018,
"subjects": [
{
"subject": "Seismology, Earthquake Hazards, Refraction seismology, Reflection Seismology, Geophysics, West Napa Fault, St. Helena"
}
],
"contributors": [],
"dates": [
{
"date": "2017-04-11",
"dateType": "Collected"
},
{
"date": "2018",
"dateType": "Issued"
}
],
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{
"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. Reference: Subcommittee of the SEG Engineering and Groundwater Geophysics Committee, Pullan, S. E., Chairman, 1990, Recommended standard for seismic (/radar) data files in the personal computer environment: Geophysics, vol. 55, no. 9, p. 1260-1271.",
"descriptionType": "Abstract"
}
],
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