Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Analysis of Intensity Attenuation Characteristics Using Physics-based Earthquake Ground-motion Simulation with Site Effect in the Southern Korean Peninsula

한반도 남부에서 부지효과를 고려한 물리적 지진동 모델링 기반 진도 감쇠 특성 분석 연구

  • An, So Hyeon (Department of Earth Science Education, Korea National University of Education) ;
  • Kyung, Jai Bok (Department of Earth Science Education, Korea National University of Education) ;
  • Song, Seok Goo (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Cho, Hyung-Ik (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources (KIGAM))
  • 안소현 (한국교원대학교 지구과학교육과) ;
  • 경재복 (한국교원대학교 지구과학교육과) ;
  • 송석구 (한국지질자원연구원 지진연구센터) ;
  • 조형익 (한국지질자원연구원 지진연구센터)
  • Received : 2020.01.31
  • Accepted : 2020.05.07
  • Published : 2020.06.30
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Abstract

This study simulated strong ground motion waveforms in the southern Korean Peninsula, based on the physical earthquake modeling of the Southern California Earthquake Center (SCEC) BroadBand Platform (BBP). Characteristics of intensity attenuation were investigated for M 6.0-7.0 events, incorporating the site effects. The SCEC BBP is software generates broadband (0-10 Hz) ground-motion waveforms for earthquake scenarios. Among five available modeling methods in the v16.5 platform, we used the Song Model. Approximately 50 earthquake scenarios each were simulated for M 6.0, 6.5, and 7.0 events. Representative metrics such as peak ground acceleration (PGA) and peak ground velocity (PGV) were obtained from the synthetic waveforms that were simulated before and after the consideration of site effects (VS30). They were then empirically converted to distribution of instrumental intensity. The intensity that considers the site effects is amplified at low rather than high VS30 zones.

미국 남캘리포니아 지진센터에서 개발한 광대역 강지진동 모사 플랫폼을 이용하여 한반도 중대규모 지진에 대해서 부지 효과를 고려한 강지진동 지진파형 모사를 수행하고 진도 감쇠 특성을 분석하였다. SCEC BBP는 시나리오 지진에 대해 광대역(0-10 Hz)으로 지진 파형을 생성 할 수 있는 소프트웨어 플랫폼이다. 본 연구에서는 5가지 모델링 방법론 중 Song Model을 사용하였다. 규모 6.0, 6.5, 7.0의 지진에 대해서 각각 약 50회의 지진 모델링을 수행하였으며 부지효과(VS30)를 고려하기 전과 후에 계산된 합성 지진 파형으로부터 최대 지반 가속도(PGA), 최대 지반 속도(PGV)와 같은 최대지진동 대표값을 산출하였다. 산출된 최대지진동 대표값은 계기진도 변환식을 이용하여 진도분포로 변환하였다. 부지효과 고려 시에는 VS30속도에 따라 연약지반 또는 충적층 지역에서 진도값이 증폭되어 나타남을 확인하였다.

Keywords

References

  1. Allen, T.I., and Wald, D.J., 2007, Topographic slope as a proxy for seismic site-conditions (VS30) and amplification around the globe, U.S. Geological Survey Open-File Report, 1357, 69p.
  2. Boore, D.M., Stewart, J.P., Seyhan, E., and Atkinson, G.M., 2014, NGA-West2 equations for predicting PGA, PGV, and 5% damped PSA for shallow crustal earthquakes, Earthquake Spectra, 30(3), 1057-1085. https://doi.org/10.1193/070113EQS184M
  3. Bozorgnia, Y., Abrahamson, N. A., Al Atik, L., Ancheta, T. D., Atkinson, G. M., Baker, J. W., Baltay, A., Boore, D. M., Campbell, K. W., Chiou, B. S.-J., Darragh, R., Day, S., Donahue, J., Graves, R. W., Gregor, N., Hanks, T., Idriss, I. M., Kamai, R., Kishida, T., Kottke, A., Mahin, S. A., Rezaeian, S., Rowshandel, B., Seyhan, E., Shahi, S., Shantz, T., Silva, W., Spudich, P., Stewart, J. P., Watson-Lamprey, J., Wooddell, K., and Youngs, R., 2014, NGA-West2 research project, Earthquake Spectra, 30, 973-987. https://doi.org/10.1193/072113EQS209M
  4. Goulet, C.A., Abrahamson. N.A., Somervlle, P.G., Wooddell, K.E., 2015, The SCEC broad band platform validation Exercise: methodology for code validation in the context of seismic-hazard analyses, Seismological Research Letters, 86(1), 17-28. https://doi.org/10.1785/0220140104
  5. Graves, R.W., and Pitarka, A., 2010, Broadband groundmotion simulation using a hybrid approach, Bulletin of the Seismological Society of America, 100(5A), 2095-2123. https://doi.org/10.1785/0120100057
  6. Kim, S.G., 2007, Seismic wave attenuation in the southern Korean peninsula: comparison by the applied method and used data, The Geological Society of Korea, 43(2), 207-217.
  7. Kim, S.K., Song, S.G., and Kyung, J.B., 2019, An analysis of intensity attenuation characteristics by physics-based strong ground-motion simulation, The Journal of The Korean Earth Science Society, 40(1), 56-67. https://doi.org/10.5467/jkess.2018.40.1.56
  8. Kim, U.H., Kim, S.G., Bagg, C.E., 2006, Research on the construction of acceleration observation network and optimization of instrument progress, Earthquake Engineering Society of Korea, 3-107.
  9. Maechling, P.J., Silva, F., Callaghan, S., Jordan, T.H., 2015, SCEC Broadband Platform: System Architecture and Software Implementation, Seismological Research Letters, 86(1), 27-38. https://doi.org/10.1785/0220140125
  10. Park, D.H., Lee, J.M., Baag, C.E., and Kim, J.K., 2001, Stochastic prediction of strong ground motions and attenuation equations in the southeastern korean peninsula, The Geological Society of Korea, 37(1), 21-30.
  11. Park, J.U., Noh, M.H., and Lee, K.H., 1999, Development of attenuation equations of ground motions in the southern part of the Korean peninsula, Earthquake Engineering Society of Korea, 3(1), 21-27.
  12. Song. S.G., 2016, Developing a generalized pseudodynamic source model of $M_w$ 6.5-7.0 to simulate strong ground motions, Geophysical Journal International, 204, 1254-1265. https://doi.org/10.1093/gji/ggv521
  13. Song. S.G., Dalguer, L.A., and Mai, P.M., 2014, Pseudodynamic source modeling with 1-point and 2-point statistics of earthquake source parameters, Geophysical Journal International, 196, 1770-1768. https://doi.org/10.1093/gji/ggt479
  14. Sun, C.G., Chung, C.K., and Kim, D.S., 2007, Determination of mean shear wave velocity to the depth of 30m based on shallow shear wave velocity profile, Earthquake Engineering Society of Korea, 11(1), 45-57. https://doi.org/10.5000/EESK.2007.11.1.045
  15. Takemura, M., Motosaka, M. and Tamanaka, H., 1995, Strong motion seismology in Japan. Journal of Physical Earth, 43, 211-257. https://doi.org/10.4294/jpe1952.43.211
  16. Wald, D.J., Quitoriano, V., Heaton, T.H., and Kanamori, H., 1999, Relationships between peak ground acceleration, peak ground velocity, and modified mercalli intensity in California, Earthquake Spectra, 15(3), 557-564. https://doi.org/10.1193/1.1586058
  17. Wald, D.J., Worden, B., Quitoriano, V., and Pankow, K.L., 2006, ShakeMap Manual, USGS.