The design spectrum for Korea, which is known to belong to an intra-plate region, is developed from the ground motion records of the earthquakes occurred in Korea and overseas intra-plate regions. The horizontal spectrum is defined as geometric mean spectrum, GMRotI50. From the statistical analysis of the geometric mean 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. The developed design spectrum is valid for the estimation both spectral acceleration and displacement.

1. 서 론
 2. 지진 목록과 분류
 3. 분석 방법과 절차
  3.1 기하평균스펙트럼
  3.2 통계분석 방법
 4. 분석 결과
 5. 국내외 지진의 비교
 6. 토 의
  6.1 국내 설계스펙트럼과 비교
  6.2 장주기 전이주기 TL
 7. 결 론
 / REFERENCES /

• 김재관(서울대학교 건설환경공학부) | Kim Jae Kwan Corresponding author
• 김정한(한국원자력연구원 종합안전평가부) | Kim Jung Han
• 이진호(부경대학교 해양공학과) | Lee Jin Ho
• 허태민(서울대학교 건설환경공학부) | Heo Tae Min