This study investigates important parameters used to determine an effective peak ground acceleration (EPGA) based on the characteristics of response spectra of historical earthquakes occurred at Korean peninsula. EPGAs are very important since they are implemented in the Korean Building Code for the seismic design of new structures. Recently, the Gyeongju earthquakes with the largest magnitude in earthquakes measured at Korea took place and resulted in non-structural and structural damage, which their EPGAs should need to be evaluated. This paper first describes the basic concepts on EPGAs and the EPGAs of the Gyeongju earthquakes are then evaluated and compared according to epicentral distances, site classes and directions of seismic waves. The EPGAs are dependant on normalizing factors and ranges of period on response spectrum constructed with the Gyeongju earthquake records. Using the normalizing factors and the ranges of period determined based on the characteristics of domestic response spectra, this paper draw a conclusion that the EPGAs are estimated to be about 30 % of the measured peak ground accelerations (PGA).

1. 서 론
 2. 유효최대지반가속도 (Effective Peak GroundAcceleration)
 3. 국내 계기지진 분석을 통한 정규화 계수 도출
  3.1 국내 지진기록의 응답스펙트럼 특징
 4. 경주지진의 유효최대지반가속도 분석
  4.1 경주지진의 응답스펙트럼 특징
  4.2 유효최대지반가속도 분석
 5. 결 론
 / REFERENCES /

• 신동현(서울시립대학교 건축공학과) | Shin Dong Hyeon
• 홍석재(서울시립대학교 건축공학과) | Hong Suk-Jae
• 김형준(서울시립대학교 건축공학과) | Kim Hyung-Joon Corresponding author