High-resolution seismic data acquired at six Southern California Seismic Network (SCSN) recording stations in 2017

Dates

Publication Date: 2021-09-29
Start Date: 2017-08-01
End Date: 2017-08-07

Citation

Chan, J.H., Catchings, R.D., Goldman, M.R., Criley, C.J., and Sickler, R.R., 2021, High-resolution seismic data acquired at six Southern California Seismic Network (SCSN) recording stations in 2017: U.S. Geological Survey data release, http://doi.org/10.5066/P990O55F.

Summary

In August 2017, the U.S. Geological Survey acquired high-resolution P- and S-wave seismic data near six Southern California Seismic Network (SCSN) recording stations in southern California: CI.OLI Olinda; CI.SRN Serrano; CI.MUR Murrieta; CI.LCG La Cienega; CI.RUS Rush; and CI.STC Santa Clara (Figure 1). These strong-motion recording stations are located inside Southern California Edison electrical substations, critical infrastructures that provide essential services to millions of customers. The primary goals of the seismic survey were to understand the potential for amplified ground shaking and to evaluate lateral variability in shear-wave velocity at these sites. We deployed up to 88 geophones at 2-m or 4-m spacing along seven [...]

Summary

In August 2017, the U.S. Geological Survey acquired high-resolution P- and S-wave seismic data near six Southern California Seismic Network (SCSN) recording stations in southern California: CI.OLI Olinda; CI.SRN Serrano; CI.MUR Murrieta; CI.LCG La Cienega; CI.RUS Rush; and CI.STC Santa Clara (Figure 1). These strong-motion recording stations are located inside Southern California Edison electrical substations, critical infrastructures that provide essential services to millions of customers. The primary goals of the seismic survey were to understand the potential for amplified ground shaking and to evaluate lateral variability in shear-wave velocity at these sites.

We deployed up to 88 geophones at 2-m or 4-m spacing along seven linear profiles surrounding the stations and collocated P- and S-wave sources at ~1-m offset from the geophones. We generated P waves using three types of active sources: a 226-kg vertical accelerated weight-drop (AWD), a 3.5-kg sledgehammer and steel plate combination, and a 2.7-kg hammer and steel plate combination. Active-source S-waves were generated by horizontally striking an aluminum block with a 3.5-kg sledgehammer and by striking a 45°-angle aluminum block with a 45°-angle AWD. We first deployed vertical-component geophones (40-Hz, Sercel^TM L40A, sensitivity of 22.34 volts/meter/second) to record P-wave shots, after which the vertical-component geophones were replaced with horizontal-component geophones (4.5-Hz, Sercel^TM L28-LBH, sensitivity of 31.3 volts/meter/second) to record S-wave shots. All data were recorded using up to two 60-channel Geometrics Stratavisor NX-60^TMseismographs with 24-bit analog-to-digital converters. The seismographs were connected to the geophones via refraction cables. Each shot was recorded at a 0.5-ms sampling rate for two seconds, with data recording starting 100 ms before the actual time of the shot. Ambient noise data were recorded with vertical-component geophones at a 2-ms sampling rate for 120 seconds. This report provides the metadata needed to utilize the seismic data.

Acknowledgements: We thank Keith Galvin, Koichi Hayashi, Dan Langermann, Tony Martin, Devin McPhillips, Ian Richardson, David Saucedo-Green, Luther Strayer, Nathan Suits, and Alan Yong for assistance in data acquisition.

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.

Contacts

Point of Contact :: Joanne H Chan, Rufus D Catchings
Process Contact :: Mark R Goldman
Originator :: Joanne H Chan, Rufus D Catchings, Mark R Goldman, Coyn J Criley, Robert R Sickler
Metadata Contact :: Joanne H Chan, Mark R Goldman
Publisher :: U.S. Geological Survey
Participant :: Keith Galvin, Koichi Hayashi, Daniel S Langermann, Tony Martin, Devin F. McPhillips, Ian Richardson, David Saucedo-Green, Luther Strayer, Nathan Suits, Alan K Yong
Distributor :: U.S. Geological Survey - ScienceBase
SDC Data Owner :: Earthquake Hazards Program
USGS Mission Area :: Natural Hazards

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LA2017_Metadata.xml “Metadata” Original FGDC Metadata	View	25.06 KB	application/fgdc+xml
LA2017Map.png “Google Earth image of our study area ”		10.58 MB	image/png
LA17.setup.csv “Acquisition parameter”		121.91 KB	text/csv
LA17.locations.csv “Geophone station locations”		16.71 KB	text/csv
LA2017_83174.zip “SEG-2 binary seismic data recorded by seismograph 83174”		932.02 MB	application/zip
“SEG-2 binary seismic data recorded by seismograph 83313”		3.21 GB	application/zip
LA17.stationID.csv “Station ID”		78 Bytes	text/csv
LA2017_summary_FINAL.docx “Summary”		2.79 MB	application/vnd.openxmlformats-officedocument.wordprocessingml.document

Related External Resources

Type: Related Primary Publication

Chan, J.H., Catchings, R.D., Goldman, M.R., Criley, C.J., and Sickler, R.R., 2024, Evaluation of 2-D shear-wave velocity models and VS30at six strong-motion recording stations in southern California using multichannel analysis of surface waves and refraction tomography: Open-File Report, https://doi.org/10.3133/ofr20241016.	https://doi.org/10.3133/ofr20241016

Purpose

The primary goals of the seismic survey were to understand the potential for amplified ground shaking and to evaluate lateral variability in shear-wave velocity at these sites.

High-resolution seismic data acquired at six Southern California Seismic Network (SCSN) recording stations in 2017

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