Time-averaged shear-wave velocity to 30 m depth about the Fallon, NV FORGE site. Title: CGS Map Sheet 48: Shear-wave Velocity in Upper 30m of Surficial Geology (Vs30) Edition: v3.0 Geospatial Data Presentation Form: vector digital data Other Citation Details: Reference: Wills, C.J., C.I. The new VS30 method is a simplification of the Spectral Analysis of … The reference value of V s30 was calculated by simple continuation or velocity continuation. The seismic codes of many countries base their site classifications on the Vs30 parameter, i.e., the average shear-wave velocity in the first 30 m of subsoil. 1. USGS has compiled measured VS30 funded by the USGS and other governmental agencies for 4389 sites in the United States. VS30 can be measured using invasive methods, such as boreholes, or non-invasive methods, such as multichannel analysis of surface waves (MASW). Near-Surface Shear Wave Velocity Versus Depth Profiles, V 30 Owing to cost considerations, as well as logistical … Risks of Solely Relying on VS30 in Ground Motion Response Studies Estimation of Time-Averaged Shear Wave Velocity (SWV) to 30 m ... Vs30 measurements (the average shear-velocity down to 30 m) are correlated against topographic slope to develop two sets of coefficients for deriving Vs30: one for active tectonic regions that possess dynamic topographic relief, and one for stable continental regions where changes in topography are more subdued. Shear-wave velocity, VS, is an important parameter for evaluating dynamic behavior of soil. Downhole suspension logging was used to record the Vs values. The shear wave velocity was computed based on the length of the wave path ( Ltt) that corresponds to the tip-to-tip distance between the transmitter and receiver, and the travel time (Δ t ), as follows: (13.1) V s = L t t Δ t. The tip-to-tip distance was determined using a digital caliper. Philippines Shear Wave Velocity (Vs30) - Datasets - OasisHUB CGS Map Sheet 48: Shear-wave Velocity in Upper 30m of Surficial Geology (Vs30) Authoritative Private Member. The 1D shear-wave velocity profiles generated for energy the source points positioned at each end of Line 1 in Figure 2 compare very well and show similar patterns of velocity layering for the upper feet130 below ground surface (BGS). Regional Correlations of VS30 and Velocities Averaged Over Depths Less Than and Greater Than 30 Meters by David M. Boore, Eric M. Thompson, and Héloïse Cadet Abstract Using velocity profiles from sites in Japan, California, Turkey, and Europe, we find that the time-averaged shear-wave velocity to 30 m (VS30), used as a proxy for site amplification in recent ground-motion … Abstract. Seismic Investigation: Additional Objectives • Obtain a shear wave velocity (Vs) profile to a depth of at least 30 m 0 0 6005004003002001000 Shear Wave Velocity (m/s) 30 m • Vs reflects the shear modulus (G) of the soil according to: 50 10 (G) of the soil according to: G = *Vs2 • Vs used to obtain simplified 100 epth(ft) 30 20 Depth( p Seismic Site Classification via …

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