The dataset is consisted of travel-time records () in SEG2 format recorded using multi-station MASW and AM arrays near 10 seismographic stations located in California. A table in the spreadsheet summarizes the data collection.

In May 2019, the U.S. Geological Survey acquired high resolution P- and S-wave seismic data near six seismic network recording stations in San Bernardino County, California: Southern California Seismic Network CI.CLT Calelectic, CI.MLS Mira Loma, CI.CJM Cajon Mountain and CI.HLN Highland; California Strong Motion Instrumentation Program station CE.23542; and US National Strong-Motion Network station NP.5326 (Figure 1). The primary goals of the seismic survey were to better understand the potential for amplified ground shaking, to evaluate lateral variability in shear-wave velocity, and to calculate Vs30 at these sites. We deployed up to 67 DTCC SmartSolo 3-component seismometer systems ("nodes") at 2-m spacing along six linear arrays and collocated P- and S-wave sources at ~1-m offset from the nodes. We generated active-source P-waves using a 3.5-kg sledgehammer and steel plate combination. Active-source S-waves were generated by horizontally striking an aluminum block with a 3.5-kg sledgehammer. SmartSolo nodes are standalone seismometers with 3-component sensors (5-Hz corner frequency and sensitivity of 76.7 volts/meter/second), battery, and built-in GPS to record location and time. The nodes recorded seismic data continuously at a 0.5-ms sampling rate, and shot timing was recorded by GPS event capture hardware to precisely determine the shot times. For some individual surveys, the nodes were buried a few inches below the ground surface to reduce noise. This report provides the metadata needed to utilize the seismic data. Acknowledgements: We thank Garet Huddleston, Dan Langermann, Carolyn Stieban, Zhenning Ma, Luther Strayer, and Chris Green for assistance in data acquisition. Reference: Barry, K.M., Cavers, D.A. and Kneale, C.W., 1975, Recommended standards for digital tape formats: Geophysics, vol. 40, no. 2, p. 344-352.

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, SercelTM 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, SercelTM 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-60TM seismographs 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: Keith Galvin, Koichi Hayashi, Dan Langermann, Tony Martin, Devin McPhillips, Ian Richardson, David Saucedo-Green, Luther Strayer, Nathan Suits, and Alan Yong 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.

The dataset is consisted of travel-time records in SEG2 format recorded using multi-station arrays near 6 seismographic stations located in southern California. A table in the spreadsheet (vs30data.SCE.FINAL01.xlsx) summarizes the data collection. Included in the dataset are figures showing incremental results supporting the resultant modeled shear-wave velocity (Vs) profile and estimated time-averaged Vs in the upper 30 m of the subsurface (Vs30). Incremental results include plots of the picks of fundamental mode dispersion curve, the modeled Vs profile and estimated Vs30, and the empirical and theoretical dispersion curves.

On August 24, 2021, the U.S. Geological Survey conducted a high-resolution seismic survey between two strong-motion recording stations located at the Veterans Affairs Medical Center (VAMC) in the City of Menlo Park, San Mateo County, California. The stations are National Strong Motion Project Station (NSMP) 1849 in VAMC building 332 and NSMP Station 1870 in VAMC building 334. The primary goals of the seismic survey are to better understand the potential for amplified ground shaking, to evaluate lateral variability in shear-wave velocity, and to calculate time-averaged shear-wave velocity in the upper 30 m of the subsurface (Vs30) at this site using refraction tomography and multichannel analysis of surface waves (MASW) methods.

In May 2015, we acquired high-resolution seismic profiles near six strong motion instruments located in Napa and Solano Counties, California. These strong motion instruments recorded horizontal peak accelerations (PGAs) from 0.329g to 0.611g, which were among the highest recorded in the Napa area during the 24 August 2014 Mw 6.0 South Napa Earthquake. Our goal is to measure the seismic velocities of the underlying geologic material at each strong motion site using P- and S-wave refraction tomography and analysis of surface waves, especially in the upper 30 m of the subsurface.

Included here is a link to seismic waveform data collected at San Emidio, Nevada in 2022. The seismic instruments used were provided by EarthScope Consortium through the EarthScope Primary Instrument Center at New Mexico Tech. Data collected are available here through EarthScope at the link below. Detailed information on instrumentation, deployment, data collection, and data quality are provided in the attached paper. In the spring of 2022, the WHOLESCALE team deployed 450 SmartSolo seismic instruments at the San Emidio geothermal field in Nevada. The deployment was executed in three phases: stakes were placed in the ground at locations using hand-held GPS receivers, seismographs were implanted next to the stakes, and seismographs were turned on to begin recording data in April. Three phases were necessary due to the combination of limits on the seismographs' battery life and personnel availability. This was the first project to use the low-power A-to-D mode instead of the standard high-resolution mode, which allowed a trade of a decrease in the digitizer's effective number of bits (from 21.8 to 21.5) for a 30% increase in battery life. After approximately one month of observation, the seismographs were turned off, removed from the ground, and cleaned on May 6th (157 sites), May 7th (157 sites), and May 8th (136 sites). The data files were downloaded onto portable hard drives. The seismographs were then shipped to the PASSCAL Instrument Center where they were converted from the original (raw) SmartSolo (DLD) format to the more standard SAC at UW and also at the PASSCAL data Instrument Center. Methods and results of evaluating data quality are included in the attached paper and Word document.

Included here is a link to seismic waveform data collected at San Emidio, Nevada in 2022. The seismic instruments used were provided by EarthScope Consortium through the EarthScope Primary Instrument Center at New Mexico Tech. Data collected are available here through EarthScope at the link below. Detailed information on instrumentation, deployment, data collection, and data quality are provided in the attached paper. In the spring of 2022, the WHOLESCALE team deployed 450 SmartSolo seismic instruments at the San Emidio geothermal field in Nevada. The deployment was executed in three phases: stakes were placed in the ground at locations using hand-held GPS receivers, seismographs were implanted next to the stakes, and seismographs were turned on to begin recording data in April. Three phases were necessary due to the combination of limits on the seismographs' battery life and personnel availability. This was the first project to use the low-power A-to-D mode instead of the standard high-resolution mode, which allowed a trade of a decrease in the digitizer's effective number of bits (from 21.8 to 21.5) for a 30% increase in battery life. After approximately one month of observation, the seismographs were turned off, removed from the ground, and cleaned on May 6th (157 sites), May 7th (157 sites), and May 8th (136 sites). The data files were downloaded onto portable hard drives. The seismographs were then shipped to the PASSCAL Instrument Center where they were converted from the original (raw) SmartSolo (DLD) format to the more standard SAC at UW and also at the PASSCAL data Instrument Center. Methods and results of evaluating data quality are included in the attached paper and Word document.