Research-Site characterization

Shear-wave velocity estimation using P-wave seismograms

Related articles: 

Jaesung Kim, Byungmin Kim* and Hyungik Cho (2020), Shear wave velocity estimation in Korea using P-wave seismograms, KSCE Journal of Civil Engineering

Sinhang Kang, Byungmin Kim*, Hyungik Cho, Junyoung Lee, Kiseog Kim, Sungjin Bae, and Chang-Guk Sun (2019), Ground motion amplifications in small-size hills: case study of Gokgang-ri, South Korea, during the 2017 ML5.4 Pohang earthquake sequence, Bulletin of the Seismological Society of America, 109 (6): 2626–2643

Byungmin Kim, Youssef M. A. Hashash, Sidao Ni, and Paul Somerville, Jonathan P. Stewart, Ellen M. Rathje, Albert R. Kottke, Walter J. Silva, and Kenneth W. Campbell (2016), Subsurface shear-wave velocity characterization using P-wave seismograms in Central and Eastern North America, Earthquake Spectra, v 32(1), 143-169

The time-averaged shear (S)-wave velocity in the upper 30 meters of sediment (VS30) is a widely used site parameter for ground motion prediction. When unavailable from measurements, VS30 is typically estimated from proxies. We proposed an alternative based on a theoretical relationship between S-wave velocity and the ratio of radial to vertical components of the compressional (P)-wave–dominated portion of the velocity time series. P-waves at the ground surface tend to be weaker in the radial direction than in the vertical direction for soft-soil sites. The ratio of radial to vertical components tends to increase with increasing site stiffness. This method provides less biased and more precise estimates of VS30 than other proxy methods (topographic slope, terrain, and surficial geology). We validated this method using the seismogram and VS data from three regions (i.e., Central and Eastern North America; Japan; and Korea).




Multi-channel Analysis of Surface Waves (MASW)

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Ambient Noise Array Test

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