Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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A Comparison Study of the Amplification Characteristics of the Seismic Station near Yedang Reservoir using Background Noise, S-wave and Coda wave Energy

배경잡음, S파 및 Coda파 에너지를 이용한 예당저수지 인근부지의 지반증폭 특성에 관한 비교 연구

  • Wee, Soung-Hoon (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Jun-Kyoung (Department of Fire Protection Engineering, Semyung University) ;
  • Yoo, Seong-Hwa (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Kyung, Jai-Bok (Department of Earth Science Education, Korea national University of Education)
  • 위성훈 (한국지질자원연구원 지진연구센터) ;
  • 김준경 (세명대학교 소방방재학과) ;
  • 유성화 (한국지질자원연구원 지진연구센터) ;
  • 경재복 (한국교원대학교, 지구과학교육과)
  • Received : 2015.11.23
  • Accepted : 2015.12.28
  • Published : 2015.12.31
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Abstract

Seismograms are composed of 3 characteristics, that is, seismic source, attenuation, and site amplification. Among them, site amplification characteristics should be considered significantly to estimate seismic source and attenuation characteristics with more confidence. This purpose of this study is to estimate the site amplification characteristics at each site using horizontal to vertical (H/V) spectral ratio method. This method, originally proposed by Nakamura (1989), has been applied to study the surface waves in microtremor records. It has been recently extended to the shear wave energy of strong motion and applied to the study of site amplification. This study analyzed the H/V spectral ratio of 6 ground motions respectively using observed data from 4 sites nearby in Yedang Reservoir. And then, site amplification effects at each site, from 3 kinds of seismic energies, that is, S waves, Coda waves energy, and background noise were compared each other. The results suggested that 4 sites showed its own characteristics of site amplification property in specific resonance frequency ranges (YDS: ~11 Hz, YDU: ~4 Hz, YDD: ~7 Hz). Comparison of this study to other studies using different analysis method can give us much more information about dynamic amplification of domestic sites characteristics and site classification.

지반진동은 지진원, 지각감쇠 및 지반의 증폭특성 등 3가지 주요 인자로 구성되어 있다. 이 중 지반 증폭특성은 지진원 및 지각감쇠를 신뢰성 있게 평가하기 위해 반드시 고려하여야 한다. 본 연구의 목적은 수평/수직(H/V) 스펙트럼비를 이용하여 각 관측소의 지반증폭 특성을 평가하는 것이다. 주파수 영역에서 H/V 스펙트럼 비를 구하는 방법은 Nakamura(1989)에 의해 처음으로 제시되었으며, 초기에는 상시미동의 표면파 특성을 이해하기 위해 사용되어 왔다. 최근에 와서 강진동의 전단파 에너지 등으로 확장되면서 지반 증폭특성 연구에 많이 이용되고 있다. 본 연구는 예당저수지 인근에 4개의 관측소에서 관측된 6개의 가속도 지반진동을 이용하여 H/V 스펙트럼 비를 분석하였고 각 지반진동의 S파, Coda파 및 배경잡음 각각으로부터 분석된 지반증폭 특성을 상호 비교하였다. 분석결과, 4개 관측소는 각각의 우월 주파수 대역(YDS: ~11 Hz, YDU: ~4 Hz, YDD: ~7 Hz)에서 관측소 고유의 증폭특성을 보여준다. 본 연구의 도출 결과와 다른 방법을 통해 구한 결과의 비교 평가는 국내 지반의 동적특성 및 지반분류 연구에 유익한 정보가 될 것으로 판단된다.

Keywords

References

  1. Kim, D.I. and Baag, C.E., 2002, Site amplification factors in Southern Korea determined from Coda waves. Earthquake Engineering Society of Korea, 16, 51-58. (in Korean)
  2. Yun, K.H., 2007, Two-dimensional Q tomography inversion for the southern part of the Korea Peninsula. Unpublished Ph.D. dissertation, Seoul National University, Seoul, Korea, 181 p.
  3. Atkinson, G.M. and Cassidy, J.F., 2000, Integrated Use of Seismograph and Strong-Motion Data to Determine Soil Amplification: Response of the Fraser River Delta to the Duvall and Georgia Strait Earthquakes. Bulletin of Seismological Society of America, 90, 1028-1040. https://doi.org/10.1785/0119990098
  4. Bonilla, L.F., Steidl, J.H., Lindley, G.T., Tumarkin, A.G., and Archuleta, R.J., 1997, Site amplification in the San Fernando Valley, California. variability of site-effect estimation using the S-wave, Coda, and H/V methods. Bulletin of Seismological Society of America, 87, 710-730.
  5. Borchert, R., 1970, Effects of local geology on ground motion near San Francisco Bay. Bulletin of Seismological Society of America, 60(2), 9-61.
  6. Cassidy, J. F. and Rogers, G. C., 1999, Seismic site response in the greater Vancouver, British Columbia area: spectral rations from moderate earthquakes. Canadian Geotechnical Journal, 36, 195-209. https://doi.org/10.1139/t98-096
  7. Castro, R.R., Mucciarelli, M., Pecor, F., and Petrungaro, C., 1997, S-wave site-response estimates using horizontal-to- vertical spectral ratios. Bulletin of Seismological Society of America, 87, 256-260.
  8. Finn, W.D.L., 1991, Geotechnical engineering aspects of microzonation. Proc. 4th International Conference. Seismic Zonation, Vol. 1, 199-259.
  9. Hartzell, S., Cranswick, E., Frankel, D., and Meremonte, M., 1997, Variability of site response in the Los Angeles Urban area. Bulletin of Seismological Society of America, 87, 1377-1400.
  10. Lermo, J. and Francisco, J.C., 1993, Site effect evaluation using spectral ratios with only one stations. Bulletin of Seismological Society of America, 83, 1574-1594.
  11. Nakamura, Y., 1989, A method for dynamic characteristics estimation of subsurface using microtremor on the ground surface. QR RTRI, 30, 25-33.
  12. Ohmachi, T., Nakamura, Y., and Toshinawa, T., 1991, Ground motion characteristics in the San Francisco Bay area detected by microtremor measurements. Proc. 2nd Int. Conf. on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, St. Louis, Missouri, 1643-1648.
  13. Phillips, S.C. and Aki, K., 1986, Sits Amplification of Coda waves from Local earthquakes in Central California. Bulletin of Seismological Society of America, 76. 627-648.
  14. Rogers, A.M., Borcherdt, R.D., Covington, P.A., and Perkins, D.M., 1984, A comparative ground response study near Los Angeles using recordings of Nevada nuclear tests and the 1971 San Fernando earthquake. Bulletin of Seismological Society of America, 74, 1925-1949.
  15. Seed, H.B., Toro, M.P., and Sun, J.L., 1998, Relationship between soil conditions and earthquake motions. Earthquake Spectra, 30, 687-729.
  16. Su, F., Anderson, J.G., Brune, J.N., and Zeng, Y., 1996, A Comparison of Direct S-Wave and Coda-Wave Site Amplification Determined from Aftershocks of the Little Skull Mountain Earthquake. Bulletin of Seismological Society of America, 86, 1006-1018.
  17. 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
  18. Tucker, B.D. and King, J.L., 1984, Dependence of Sediment-filled Valley Response on Input Amplitude and Valley Properties. Bulletin of Seismological Society of America, 74, 153-165.

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