Characteristics of the Point-source Spectral Model for Odaesan Earthquake (M=4.8, '07. 1. 20)

오대산지진(M=4.8, '07. 1. 20)의 점지진원 스펙트럼 모델 특성

  • Yun, Kwan-Hee (Environmental & Structural Lab., Korea Electric Power Research Institute) ;
  • Park, Dong-Hee (Environmental & Structural Lab., Korea Electric Power Research Institute)
  • 연관희 (한전전력연구원 환경구조연구소) ;
  • 박동희 (한전전력연구원 환경구조연구소)
  • Published : 2007.11.30

Abstract

The observed spectra from Odaesan earthquake were fitted to a point-source spectral model to evaluate the source spectrum and spatial features of the modelling error. The source spectrum was calculated by removing from the observed spectra the path and site dependent responses (Yun, 2007) that were previously revealed through an inversion process applied to a large accumulated spectral dataset. The stress drop parameter of one-corner Brune's ${\omega}^2$ source model fitted to the estimated source spectrum was well predicted by the scaling relation between magnitude and stress drop developed by Yun et al. (2006). In particular, the estimated spectrum was quite comparable to the two-corner source model that was empirically developed for recent moderate earthquakes occurring around the Korean Peninsula, which indicates that Odaesan earthquake is one of typical moderate earthquakes representative of Korean Peninsula. Other features of the observed spectra from Odaesan earthquake were also evaluated based on the commonly treated random error between the observed data and the estimated point-source spectral model. Radiation pattern of the error according to azimuth angle was found to be similar to the theoretical estimate. It was also observed that the spatial distribution of the errors was correlated with the geological map and the $Q_0$ map which are indicatives of seismic boundaries.

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