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Seismic Response from Microtremor of Chogye Basin, Korea

초계분지의 상시미동 지진응답

  • Lee, Heekyoung (Division of Earth Environmental System Science, Pukyong National University) ;
  • Kim, Roungyi (Division of Earth Environmental System Science, Pukyong National University) ;
  • Kang, Tae-Seob (Division of Earth Environmental System Science, Pukyong National University)
  • 이희경 (부경대학교 지구환경시스템과학부) ;
  • 김령이 (부경대학교 지구환경시스템과학부) ;
  • 강태섭 (부경대학교 지구환경시스템과학부)
  • Received : 2017.02.22
  • Accepted : 2017.03.06
  • Published : 2017.05.31

Abstract

Chogye basin, which is surrounded by country rock, has a closed-basin form. In such a basin, incident seismic energy can form multiply reflected waves, thus causing energy concentration to occur at this closed-basin area. Microtremor measurement survey was performed at the Chogye basin, which is located in Chogye-myeon and Jeokjungmyeon, Hapcheon-gun, Gyeongsangnam-do, Republic of Korea. Microtremor data were transformed into the frequency domain, and then the horizontal-to-vertical spectral ratios (HVSR) were calculated. Fundamental resonance frequencies were estimated from the HVSR results for every observation point. Using the empirical relationship between site period and thickness for sediment sites in Korea known from the previous study, the distribution of sediment thickness of the Chogye basin was estimated from the fundamental resonance frequencies. Being compared with the mountainous rim with steep slope, the measurement points inside the basin have low values of the fundamental resonance frequency with the minimum of 1.03 Hz, which corresponds to the thickness of sedimentary layer with the maximum depth of about 100 m. A three-dimensional basin model was constructed for bedrock topography of the Chogye basin by an interpolation of basin depths estimated at each measurement site.

Acknowledgement

Supported by : 부경대학교

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