Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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In Situ Site Characterization Adopting Intensive Geophysical Tests at Seismic Stations in Southeastern Korea

한반도 동남부 주요 지진관측소에서의 다양한 지구물리 시험을 통한 원위치 지반특성 평가

  • Sun, Chang-Guk (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Cho, Hyung-Ik (Department of Civil Systems Engineering, Andong National University) ;
  • Kim, Han-Saem (Department of Civil and Energy System Engineering, Kyonggi University) ;
  • Lee, Moon-Gyo (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources)
  • 선창국 (한국지질자원연구원 지진연구센터) ;
  • 조형익 (국립안동대학교 건설시스템공학과) ;
  • 김한샘 (경기대학교 사회에너지시스템공학과) ;
  • 이문교 (한국지질자원연구원 지진연구센터)
  • Received : 2024.11.17
  • Accepted : 2024.12.09
  • Published : 2025.01.01
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Abstract

There are now many seismic observatory stations, excluding the acceleration monitoring network for infrastructures, of more than 300 operated by several public and governmental organizations across South Korea. The features of the site and properties of the stations were not investigated, and they have been assumed or guessed to estimate the site-specific seismic responses during the 2016 Gyeongju and 2017 Pohang earthquake events. For these reasons, various and intensive geotechnical and geophysical investigations have been conducted to quantify the site characteristics at 15 seismic stations selected in southeastern Korea. The VS profiles were, at first, obtained by performing only a downhole seismic test (DHT) at 7 stations, and were compared with those from a surface wave method. Then, the shear wave velocity (VS) profiles were deduced by combining three types of in situ seismic methods composed of a cross-hole seismic test, DHTs, and full-waveform sonic loggings at the 8 other stations, especially to complement the application limits of DHT and reduce the depth-dependent uncertainty in VS profile. The representative site characteristic profiles for each station regarding VS and VP with borehole stratigraphy and density were determined based on robust investigations. Various site parameters related to seismic responses at the seismic stations of interest were obtained for the site-specific geotechnical information, which would be useful to earthquake engineering practices.

Keywords

Acknowledgement

본 연구는 한국지질자원연구원 기본사업의 일환으로 수행되었으며, 이에 감사드립니다.

References

  1. Sun CG, Kim DS, Chung CK. Geologic site conditions and site coefficients for estimating earthquake ground motions in the inland areas of Korea. Engineering Geology. 2005;81(4):446-469. https://doi.org/10.1016/j.enggeo.2005.08.002
  2. KIGAM. Active fault map and seismic hazard map. Korea Institute of Geoscience and Mineral Resources, National Emergency Management Agency. Korea; c2012. 939 p.
  3. NEMA. Announcement of Seismic Hazard Maps of Korea. NEMA official notice 2013-179. National Emergency Management Agency. Korea; c2013. 10 p.
  4. KIGAM. Earthquakes in the Southeast Korean Peninsula: Focusing on the 2016 Gyeongju and the 2017 Pohang Earthquakes. Korea Institute of Geoscience and Mineral Resources. Korea; c2018. 56 p.
  5. Lee CH, Kim SY, Park JH, Kim DK, Kim TJ, Park KH. Comparative analysis of structural damage potentials observed in the 9.12 Gyeongju and 11.15 Pohang earthquakes. J Earthq Eng Soc Korea. 2018;22(3):175-184. https://doi.org/10.5000/EESK.2018.22.3.175
  6. Sun CG, Cho HI, Kim HS, Lee MG. In Online Proceedings of the 18th World Conference on Earthquake Engineering (WCEE2024). Milan, Italy. 2024 July: [11 p]. Available from: https://proceedings-wcee.org/wcee18.html
  7. MOIS. Act on the preparation for earthquake and volcanic eruptions. Ministry of the Interior and Safety, Ministry of Government Legislation. Amended; c2016. 13 p.
  8. KMA. National earthquake comprehensive information system (NECIS): Seismic Stations Page [Internet]. Korea Meteorological Administration. Available from: https://necis.kma.go.kr/necis-dbf/user/ob/earthquakeObservatoryListPage.do?fromFlag=start
  9. Manandhar S, Cho HI, Kim DS. Effect of bedrock stiffness and thickness of weathered rock on response spectrum in Korea. KSCE J Civ Eng. 2016;20(7):2677-2691. https://doi.org/10.1007/s12205-016-0811-z
  10. Sun CG, Kim BH, Park KH, Chung CK. Geotechnical comparison of weathering degree and shear wave velocity in the decomposed granite layer in Hongseong, South Korea. Environ Earth Sci. 2015;74(9):6901-6917. https://doi.org/10.1007/s12665-015-4692-0
  11. Sun CG. Determination of mean shear wave velocity to 30 m depth for site classification using shallow depth shear wave velocity profile in Korea. Soil Dyn Earthq Eng. 2015;73:17-28. https://doi.org/10.1016/j.soildyn.2015.02.011
  12. Wills CJ, Clahan KB. Developing a map of geologically defined site-condition categories for California. Bull Seismol Soc Am. 2006;96(4A):1483-1501. https://doi.org/10.1785/0120050179
  13. Wald DJ, Allen TI. Topographic slope as a proxy for seismic site conditions and amplification. Bull Seismol Soc Am. 2007;97(5):1379-1395. https://doi.org/10.1785/0120060267
  14. Kim HS, Sun CG, Lee MG, Cho HI. Terrain proxy-based site classification for seismic zonation in North Korea within a geospatial data-driven workflow. Remote Sensing. 2021;13(9):1844. https://doi.org/10.3390/rs13091844
  15. Wen R, Ren Y, Shi D. Improved HVSR site classification method for free-field strong motion stations validated with Wenchuan aftershock recordings. Earthq Eng Eng Vibr. 2011;10(3):325-337. https://doi.org/10.1007/s11803-011-0069-x
  16. Lee SH, Sun CG, Yoon JK, Kim DS. Development and verification of a new site classification system and site coefficients for regions of shallow bedrock in Korea. J Earthq Eng. 2012;16(6):795-819. https://doi.org/10.1080/13632469.2012.658491
  17. Dobry R, Borcherdt RD, Crouse CB, Idriss IM, Joyner WB, Martin GR, Power MS, Rinne EE, Seed RB. New site coefficients and site classification system used in recent building seismic code provisions. Earthquake Spectra. 2000;16(1):41-67. https://doi.org/10.1193/1.1586082
  18. Sun CG, Cho HI, Kim HS, Lee MG. Determining N value from SPT blows for 30 cm penetration in weathered strata. Geomech Eng. 2022;28(6):625-636.
  19. Matsumoto T, Phan LT, Oshima A, Shimono S. Measurements of driving energy in SPT and various dynamic cone penetration tests. Soils Found. 2015;55(1):201-212. https://doi.org/10.1016/j.sandf.2014.12.016
  20. Sun CG. Geotechnical information system and site amplification characteristics for earthquake ground motions at inland of the Korean peninsula. Ph.D. Dissertation, Seoul National University. Korea; c2004. 375 p.
  21. Sun CG. Mok YG, Chung CK, Kim MM. Reliable Evaluation of Dynamic Ground Properties from Cross-hole Seismic Test using Spring-loaded Lateral Impact Source. J Earthq Eng Soc Korea. 2006;10(4):1-13. https://doi.org/10.5000/EESK.2006.10.4.001
  22. Crow HL. Full waveform sonic logging for shear wave velocity. Shear Wave Velocity Measurement Guidelines for Canadian Seismic Site Characterization in Soil and Rock. Geological Survey of Canada. Open File 7078; c2012:139-149.
  23. Olafsdottir EA, Erlingsson S, Bessason B. Tool for analysis of multichannel analysis of surface waves (MASW) field data and evaluation of shear wave velocity profiles of soils. Can Geotech J. 2018;55(2):217-233. https://doi.org/10.1139/cgj-2016-0302
  24. Sun CG, Cho CS, Son M, Shin JS. Correlations between shear wave velocity and in-situ penetration test results for Korean soil deposits. Pure Appl Geophys. 2013;170(3):271-281. https://doi.org/10.1007/s00024-012-0516-2
  25. Cho HI, Lee MG, Sun CG, Kim HS. Evaluation of engineering site conditions in North Gyeongsang Province, South Korea, using a large database of borehole and standard penetration test data. Eng Geol. 2021;294:106306. https://doi.org/10.1016/j.enggeo.2021.106306
  26. Kim HS, Sun CG, Cho HI. Site-specific zonation of seismic site effects by optimization of the expert GIS-based geotechnical information system for western coastal urban areas in South Korea. Int J Disaster Risk Sci. 2019;10(1):117-133 https://doi.org/10.1007/s13753-018-0208-3
  27. MOLIT. KDS 17 10 00: General Seismic Design. Ministry of Land, Infrastructure and Transport. Korea; c2018. 17 p.
  28. Lee MG, Kim Y, Cho HI, Kim HS, Sun CG, Seong YJ, Che IY. KIGAM Quake: An open platform for seismological data and earthquake research information. Geomech Eng. 2024;37(3):279-291.