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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.89-100
DOI : https://doi.org/10.5000/EESK.2026.30.2.89

Non-ergodic Calibration of NGA-East Ground Motion Models and Uncertainty Reduction Based on Seismic Records in South Korea

Kim Yoon-Ah1)*, Ha Jeong-Gon2), Kim Min Kyu3)
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 establishes a structured development procedure for a non-ergodic ground motion model (GMM) and applies it to Korean seismic records to evaluate uncertainty reduction. The proposed framework includes data screening based on signal-to-noise ratio, residual computation relative to NGA-East predictions, identification of systematic trends, and stepwise correction of site, magnitude, and distance effects. A total of 368 records from 16 earthquakes (Mw ≥ 4.0) observed at 53 stations were analyzed. The residuals exhibited clear VS30-dependent trends, particularly at short periods (–0.2 s). Period-dependent VS₃₀ correction terms were derived through linear regression, with additional corrections for magnitude and distance applied when sufficient data were available. Spectral comparisons for the 2016 Gyeongju and 2017 Pohang earthquakes demonstrated improved agreement after calibration. The stepwise corrections resulted in a consistent reduction of total standard deviation across periods, with the largest decrease observed near 0.1 s. These results indicate that the proposed development procedure provides a practical pathway for transitioning from ergodic to partially non-ergodic modeling and effectively reduces aleatory uncertainty for Korean seismic hazard applications.

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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