Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Scenario-Based Liquefaction Assessment of the Nakdonggang Delta Area Using Synthetic Ground Motions

인공합성 지반 운동을 활용한 낙동강 삼각주 지역의 지진 시나리오 기반 액상화 평가

  • Oh, Jun Su (Department of Civil Engineering, Changwon National University) ;
  • Kim, Jaehwi (Department of Civil and Natural Resources Engineering, University of Canterbury) ;
  • Jeong, Seokho (Department of Civil Engineering, Changwon National University)
  • 오준수 (창원대학교 토목공학과) ;
  • 김재휘 (University of Canterbury 토목공학과) ;
  • 정석호 (창원대학교 토목공학과)
  • Received : 2024.10.25
  • Accepted : 2024.11.21
  • Published : 2025.01.01
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Abstract

In stable continental regions, selecting appropriate ground motions for seismic design and dynamic response analysis presents significant challenges. This study evaluates the liquefaction potential of the Nakdonggang delta region, South Korea, by generating synthetic ground motion scenarios and applying a scenario-based liquefaction assessment approach. We utilized a hybrid broadband ground motion simulation method proposed by Graves and Pitarka (2010, 2015) to create bedrock ground motions for three hypothetical earthquakes (Mw 6.2 and 6.0) occurring along the Dongrae and Miryang faults. The generated synthetic ground motions were used as input for one-dimensional nonlinear site response analyses, incorporating shear wave velocity profiles derived from surface wave inversion. The simulated ground motions demonstrated higher responses at short periods and relatively weaker responses at long periods compared to the Korean design spectra. This amplification of long-period components was attributed to the dynamic response of deep sedimentary layers, while high-frequency components were generally deamplified due to damping effects in shallow silty layers. Liquefaction susceptibility was assessed using surface ground motions derived from the site response analyses, following the SPT-based simplified method proposed by Idriss and Boulanger (2008). Results indicated high liquefaction potential across most sites for the Dongrae earthquake scenario, while liquefaction was unlikely for all sites under the Miryang-1 scenario. For the Miryang-2 scenario, liquefaction was predicted at some sites. Overall, liquefaction is expected at PGA values of approximately 0.13 g or higher, with sites exhibiting lower shear wave velocities being more vulnerable to liquefaction

Keywords

Acknowledgement

이 논문은 2023~2024년도 국립창원대학교 자율연구과제 연구비 지원으로 수행된 연구결과임.

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