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ISSN : 1226-525X(Print)
ISSN : 2234-1099(Online)
Journal of the Earthquake Engineering Society of Korea Vol.30 No.2 pp.79-87
DOI : https://doi.org/10.5000/EESK.2026.30.2.79

Development of a Correction Model to Enhance EXSIM-Estimated Horizontal Spectral Accelerations for Southeastern Korea

Seo Hwanwoo1)*, Ha Jeong-Gon2), Kim Minkyu3)
1)Postdoctoral Researcher, Structural and Seismic Safety Research Division, Korea Atomic Energy Research Institute 2)Senior Researcher, Structural and Seismic Safety Research Division, Korea Atomic Energy Research Institute 3)Principal Researcher, Structural and Seismic Safety Research Division, Korea Atomic Energy Research Institute

Abstract

This study develops a correction model to improve the accuracy of horizontal spectral accelerations estimated by stochastic extended finite-fault simulation (EXSIM) in southeastern Korea. EXSIM predictions for five earthquakes (M4.3-5.5) recorded at eight stations reveal frequency-dependent residuals, with a tendency to underpredict spectral accelerations at frequencies ≥ 3 Hz. These discrepancies are correlated with eight variables: moment magnitude, stress drop, hypocentral distance, azimuth, average shear wave velocity up to 30 m in depth, relative elevation, and slope. To address these discrepancies, a multiple linear regression model is developed using eight variables that reflect earthquake source characteristics, wave-propagation paths, and site-specific conditions, including azimuth and topographic effects not fully accounted for in the original EXSIM. Application of this correction model substantially improves predictive performance, reducing root-mean-square error by 18.8% to 81.0% for the test sets. The corrected response spectra show good overall agreement with observations, including high-frequency spectral peaks. This approach enables the construction of reliable ground-motion databases. It enhances the accuracy of EXSIM predictions for scenario earthquakes, providing a practical tool for seismic hazard assessment in regions with sparse observational data.

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    Reference

    Journal Abbreviation J. Earthq. Eng. Soc. Korea
    Frequency Bimonthly
    Doi Prefix 10.5000/EESK
    Year of Launching 1997
    Publisher Earthquake Engineering Society of Korea
    Indexed/Tracked/Covered By