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

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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 cross-correlations 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.

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Acknowledgments

This study would not have been possible without the digital data sets provided by the Korea Institute of Geoscience and Mineral Resources (KIGAM) and the Korea Meteorological Administration (KMA). This study was done by support of the Basic Research Project of KIGAM funded by the Ministry of Knowledge Economy of Korea.

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Authors and Affiliations

  1. Petroleum Technology Institute, Korea National Oil Corporation, Anyang, 431-711, South Korea

    Kwang Hyun Cho

  2. School of Earth and Environmental Sciences, Seoul National University, Seoul, 151-742, South Korea

    Sang-Hyun Lee

  3. Korea Institute of Geoscience and Mineral Resources, Daejeon, 305-350, South Korea

    Ik-Bum Kang

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  1. Kwang Hyun Cho
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  2. Sang-Hyun Lee
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Correspondence to Kwang Hyun Cho.

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Cho, K.H., Lee, SH. & Kang, IB. Crustal Structure of the Korean Peninsula Using Surface Wave Dispersion and Numerical Modeling. Pure Appl. Geophys. 168, 1587–1598 (2011). https://doi.org/10.1007/s00024-011-0262-x

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