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On November 15, 2017, Pohang earthquake occurred. Its local magnitude was announced to be ML=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 the Korean 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.
1. 서 론
2. 포항 지진과 데이터
2.1 포항 지진 요약
3. 수평스펙트럼
3.1 GMRotI50 스펙트럼
3.2 회귀분석
3.3 표준설계스펙트럼과의 비교
4. 수직스펙트럼
4.1 수직스펙트럼과 회귀분석
4.2 포항 지진 수평, 수직 스펙트럼 형상 비교
4.3 포항 지진의 장주기 성분
4.4 V/H 비
4.5 표준설계스펙트럼과 비교
5. 결 론
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