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Response Spectra of 2017 Pohang Earthquake and Comparison with Korean Standard Design Spectra

2017년 포항지진 스펙트럼과 한국표준설계스펙트럼의 비교

  • Heo, Tae Min (Department of Civil and Environmental Engineering, Seoul National University) ;
  • Kim, Jung Han (School of Urban, Architecture and Civil Engineering, Pusan National University) ;
  • Lee, Jin Ho (Department of Ocean Engineering, Pukyong National University) ;
  • Kim, Jae Kwan (Department of Civil and Environmental Engineering, Seoul National University)
  • 허태민 (서울대학교 건설환경공학부) ;
  • 김정한 (부산대학교 건설융합학부) ;
  • 이진호 (부경대학교 해양공학과) ;
  • 김재관 (서울대학교 건설환경공학부)
  • Received : 2018.02.20
  • Accepted : 2018.03.28
  • Published : 2018.04.30

Abstract

On November 15, 2017, Pohang earthquake occurred. Its local magnitude was announced to be $M_L=5.4$ by Korea Meteorological Administration (KMA). Ground motion data recorded at KMA stations were obtained from their data bases. From the data, horizontal and vertical response spectra, and V/H ratio were calculated. The horizontal spectra were defined as GMRotI50 spectra. From the statistical analysis of the GMRotI50 spectra, a mean plus one standard deviation spectrum in lognormal distribution is obtained. Regression analysis is performed on this curve to determine the shape of spectrum including transition periods. Applying the same procedure, the shape and transition periods of vertical spectrum were obtained. These results were compared with theKorean standard design spectra, which were developed from domestic and overseas intra-plate earthquake records, and Gyeongju earthquake response spectra. The response spectra of Pohang earthquake were found to be almost identical with the newly proposed design spectra. Even the V/H ratios showed good agreement. These results confirmed that the method adopted when developing the standard design spectra were valid and the developed design spectra were reliable.

Keywords

Pohang earthquake;Korean standard design spectra;Intra-plate earthquake;GMRotI50 spectrum;V/H ratio

Acknowledgement

Grant : 기상.지진See-At기술개발연구

Supported by : 기상청

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Cited by

  1. Amplification Characteristics of Domestic and Overseas Intraplate Earthquake Ground Motions in Korean Soil and Standard Horizontal Design Spectrum for Soil Sites vol.22, pp.7, 2018, https://doi.org/10.5000/EESK.2018.22.7.391