Estimation of Brune's Stress Drops around the Korean Peninsula

한반도 인근 지진의 Brune 응력강하량(파라미터)추정에 대한 고찰

  • 연관희 (한국전력공사 전력연구원) ;
  • 박동희 (한국전력공사 전력연구원) ;
  • 장천중 (한국전력공사 전력연구원)
  • Published : 2006.03.17

Abstract

Stress drops of Brune's single-corner ${\omega}^2$ source model were estimated for the earthquakes (2.0$M3.5{\sim}4.0$ and increase up to $M4.5{\sim}5.0$ above which the level of the stress drop could be assumed to be flat or decrease according to whether the rupture process accompanies buried fault or surface rupturing. The converted data of corner frequency and seismic moment were nicely fitted to the relation of $M_0{\propto}f^3$ but show systematically higher corner frequencies for $M_0>10^15$ Nm. This relationship enables systematic evaluation of a scaling relation between magnitude and stress drop. The inverted level of the stress drop is comparable to the recent studies conducted domestic and abroad. A result of lower stress drop estimated by Jun(1991) is supposed to be due to the use of low frequency spectra and existence of two-comer source model around the Korean Peninsula.

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