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1 School of Earth and Environmental
Sciences
Seoul National University
Seoul 151-742, South
Korea
(K.H.C, K.L)
2 Department of Earth and Atmospheric
Sciences
Saint Louis University, 203 ONeil Hall
3642 Lindell
Boulevard
St. Louis, Missouri 63108
(R.B.H.)
3 Department of Geosciences
Penn
State University, Deike Bldg.
University Park, Pennsylvania
16802
(C.J.A)
Cross correlation of seismic-background motions (Campillo and Paul, 2003; Shapiro et al., 2005) is applied to observations from the Korean Meteorological Administration seismic network to estimate the short-period Rayleigh and Love wave dispersion characteristics of the region. Standard processing procedures are applied to the cross correlation, except that signal whitening is used in place of one-bit sampling to equalize power in signals from different times. Multiple-filter analysis is used to extract the group velocities from the estimated Greens functions, which are then used to image the spatially varying dispersion at periods between 0.5 and 20 sec. The tomographic inversion technique used inverts all periods simultaneously to provide a smooth dispersion curve as a function of period in addition to the usual smooth spatial image for a given period. The Gyeongsang Basin in the southeastern part of the peninsula is clearly resolved with lower group velocities.
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