한국지진공학회논문집 (Journal of the Earthquake Engineering Society of Korea)

  • 제22권6호
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  • Pages.323-332
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  • 2018
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  • 1226-525X(pISSN)
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  • 2234-1099(eISSN)
한국지진공학회 (Earthquake Engineering Society of Korea)
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국내 중규모 지진에 대한 계측진도 추정식 연구

Study on the Relations to Estimate Instrumental Seismic Intensities for the Moderate Earthquakes in South Korea

  • 연관희 (한전전력연구원 구조내진그룹) ;
  • 이강렬 (한전전력연구원 구조내진그룹)
  • Yun, Kwan-Hee (Structural & Seismic Tech. Group, KEPCO (Korea Electric Power Corporation) Research Institute) ;
  • Lee, Kang-Ryel (Structural & Seismic Tech. Group, KEPCO (Korea Electric Power Corporation) Research Institute)
  • 투고 : 2018.06.14
  • 심사 : 2018.07.12
  • 발행 : 2018.09.01
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초록

Recent two moderate earthquakes (2016 $M_w=5.4$ Gyeongju and 2017 $M_w=5.5$ Pohang) in Korea provided the unique chance of developing a set of relations to estimate instrumental seismic intensity in Korea by augmenting the time-history data from MMI seismic intensity regions above V to the insufficient data previously accumulated from the MMI regions limited up to IV. The MMI intensity regions of V and VI was identified by delineating the epicentral distance from the reference intensity statistics in distance derived by using the integrated MMI data obtained by combining the intensity survey results of KMA (Korea Meteorological Administration) and 'DYFI (Did You Feel It)' MMIs of USGS. The time-histories of the seismic stations from the MMI intensity regions above V were then preprocessed by applying the previously developed site-correction filters to be converted to a site-equivalent condition in a manner consistent with the previous study. The average values of the ground-motion parameters for the three ground motion parameters of PGA, PGV and BSPGA (Bracketed Summation of PGA per second for 30 seconds) were calculated for the MMI=V and VI and used to generate the dataset of the average values of the ground-motion parameters for the individual MMIs from I to VI. Based on this dataset, the linear regression analysis resulted in the following relations with proposed valid ranges of MMI. $MMI=2.36{\times}log_{10}(PGA(gal))+1.44$ ($I{\leq}MMI$$MMI=2.44{\times}log_{10}(PGV(kine))+4.86$ ($I{\leq}MMI$$MMI=2.59{\times}log_{10}(BSPGA(gal{\cdot}sec))-1.02$ ($I{\leq}MMI$

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