Crustal Structure of the Korean Peninsula Using Surface Wave Dispersion and Numerical Modeling

Abstract

Surface wave dispersion is studied to obtain the 1-D average velocity structure of the crust in the Korean Peninsula by inverting group-and phase-velocities jointly. Group velocities of short-period Rayleigh and Love waves are obtained from crosscorrelations of seismic noise. Multiple-filter analysis is used to extract the group velocities at periods between 0.5 and 20 s. Phase velocities of Rayleigh waves in 10-and 50-s periods are obtained by applying the two-station method to teleseismic data. Dispersion curves of all group and phase velocities are jointly inverted for the 1-D average model of the Korean Peninsula. The resultant model from surface wave analysis can be used as an initial model for numerical modeling of observations of North Korean events for a velocity model appropriated to the Korean Peninsula. The iterative process is focused especially on the surface sedimentary layer in the numerical modeling. The final model, modified by numerical modeling from the initial model, indicates that the crust shear wave velocity increases with depth from 2.16 km/s for a 2-km-thick surface sedimentary layer to 3.79 km/s at a Moho depth of 33 km, and the upper mantle has a velocity of 4.70 km/s.

A Pannon-medence S-hullám-sebességterének vizsgálata

“…Ezért a gyakorlatban a diszperziós görbék meghatározásához használt keresztkorrelációs függvényt több rövidebb keresztkorrelációs függvény összegzésével állítjuk elő. Korrelálhatjuk például a napi szeizmogramokat (Ren et al, 2013), vagy rövidebb, akár 1 órás szakaszokat is (Cho et al, 2011;Seats et al, 2012;Szanyi et al, 2013). Lokális kutatás esetén (pl.…”

Crust and upper mantle structures of the region between Korea and Taiwan by surface wave dispersion study

“…Surface-wave group and phase-velocity investigations are being actively conducted the world over (Cho and Lee, 2006;Cho et al, 2007;Yoo et al, 2007;Nishida et al, 2008;Yang et al, 2010;Cho et al, 2011). The analysis technique provides important information on the properties of the crust and upper mantle in various regions of the Earth.…”