Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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A Study of Q$_P^{-1}$ and Q$_S^{-1}$ Based on Data of 9 Stations in the Crust of the Southeastern Korea Using Extended Coda Normalization Method

확장 Coda 규격화 방법에 의한 한국남동부 지각의 Q$_P^{-1}$, Q$_S^{-1}$연구

  • Chung, Tae-Woong (Department of Earth Science, Sejong University) ;
  • Sato, Haruo (Department of Geophysics, Tohoku University) ;
  • Lee, Kie-Hwa (School of Earth and Environmental Science, Seoul National University)
  • 정태웅 (세종대학교 지구과학과) ;
  • ;
  • 이기화 (서울대학교 지구시스템과학부)
  • Published : 2001.12.31
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Abstract

For the southeastern Korea aound the Yangsan fault we measured Q$_P^{-1}$ and Q$_S^{-1}$ simultaneously by using the extended coda-normalization method for seismograms registered at 9 stations deployed by KIGAM. We analyzed 707 seismograms of local earthquakes that occurred between December 1994 and February 2000. From seismograms, bandpass filtered traces were made by applying Butterworth filter with frequency-bands of 1${\sim}$2, 2${\sim}$4, 4${\sim}$8, 8${\sim}$16 and 16${\sim}$32 Hz. Estimated Q$_P^{-1}$ and Q$_S^{-1}$ values decrease from (7${\pm}$2)${\times}$10$^{-3}$ and (5${\pm}$4)${\times}$10$^{-4}$ at 1.5 Hz to (5${\pm}$4)${\times}$10$^{-3}$ and (5${\pm}$2)${\times}$10$^{-4}$ at 24 Hz, respectively. By fitting a power-law frequency dependent to estimated values over the whole stations, we obtained 0.009 (${\pm}$0.003)f$^{-1.05({\pm}0.14)$ for Q$_P^{-1}$ and 0.004 (${\pm}$0.001)f$^{-0.75({\pm}0.14)$) for Q$_S^{-1}$, where f is frequency in Hz.

양산단층이 지나는 한국 남동지방 지각의 Q$_P^{-1}$ 및 Q$_S^{-1}$를 한국자원연구소가 설치한 9점의 지진관측소 자료를 바탕으로 확장 Coda 규격화법을 이용하여 구하였다 1994년 12월부터 2000년 2월에 일어난 근지지진에서 707개 지진기록에 대하여 1${\sim}$2, 2${\sim}$4, 4${\sim}$8, 8${\sim}$16및 16${\sim}$32Hz의 대역필터를 적용하여 분석한 결과, 각 관측점의 Q$_P^{-1}$는 (7${\pm}$2)${\times}$10$^{-3}$에서 (5${\pm}$4)${\times}$10$^{-4}$으로, Q$_S^{-1}$는 5${\pm}$4)${\times}$10$^{-4}$에서 (5${\pm}$2)${\times}$10$^{-4}$로 주파수가 1.5Hz에서 24Hz로 늘어남에 따라 줄어드는 주파수 의존성이 보인다. 이들 값의 지수 회귀선은 Q$_P^{-1}$가 0.009(${\pm}$0.003)f$^{-1.05({\pm}0.14)$, Q$_S^{-1}$가 0.004(${\pm}$0.001)f$^{-0.75({\pm}0.14)$)이다.

Keywords

References

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