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Inversion of Rayleigh-wave Dispersion Curves for Near-surface Shear-wave Velocities in Chuncheon Area
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  • Journal title : Geophysics and Geophysical Exploration
  • Volume 15, Issue 1,  2012, pp.1-7
  • Publisher : Korean Society of Earth and Exploration Geophysicists
  • DOI : 10.7582/GGE.2012.15.1.001
 Title & Authors
Inversion of Rayleigh-wave Dispersion Curves for Near-surface Shear-wave Velocities in Chuncheon Area
Kim, Ki-Young; Kim, Woo-Jung; Park, Yeong-Hwan;
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 Abstract
To evaluate methods of determining near-surface shear-wave velocities (), we derived dispersion curves of Rayleigh waves generated by both passive and active sources in Chuncheon, Korea. Microtremors were recorded for 5 minutes in each of four triangular arrays with radii of 5 ~ 40 m. Those data were analyzed using the Spatial Autocorrelation method. Rayleigh waves were also generated by a hammer source and recorded in the same area for 2 s using 24 4.5-Hz geophones. Multichannel Analysis of Surface Waves was applied to those data. Velocity spectra were derived with relatively high signal-to-noise ratios in the frequency ranges of 7 ~ 19 and 11 ~ 50 Hz for the microtremors and synthetically generated Rayleigh waves, respectively. The resultant dispersion curves were combined as one and then input to inversion to derive shear wave velocities that were compared with a lithology log from a nearby well. Shearwave velocities in the top soil and soft-rock layers are almost constant with values of 221 and 846 m/s, respectively; while the inverse-modeled increases linearly in the gravelly sand, cobbles, and weathered-rock layers. If rock type is classified based on shear-wave velocity, the inversion-derived boundary between weathered-rock and soft rock may be about 5 m deeper than in the well log.
 Keywords
near-surface shear-wave velocities;Rayleigh-wave dispersion;spatial autocorrelation method;multichannel analysis of surface wave;
 Language
Korean
 Cited by
1.
레일리파 분산을 역산하여 구한 횡파속도를 이용한 춘천시의 부지특성,정진훈;김기영;

지구물리와물리탐사, 2014. vol.17. 1, pp.1-10 crossref(new window)
1.
Site Characterization using Shear-Wave Velocities Inverted from Rayleigh-Wave Dispersion in Chuncheon, Korea, Geophysics and Geophysical Exploration, 2014, 17, 1, 1  crossref(new windwow)
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