Geophysics and Geophysical Exploration (지구물리와물리탐사)

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
권호 표지

The study of Reversed Two Station Method on Korea-Japan Seismic Data to Obtain Lg Attenuation of Korean Peninsula

한반도 Lg파 감쇠상수 도출을 위한 한일 지진자료의 RTSM 적용에 대한 연구

  • 정태웅 (세종대학교 지구환경과학과)
  • Published : 2008.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

Lg amplitude decrease $Q^{-1}$ is very important because the Lg phase is the largest seismic phase in Korea if hazardous earthquakes occurred at neighbor nations such as Japan and China. Since reliable $Q^{-1}$ from two station method can be obtained by long pair distance of stations or events, we used seismic stations both Korea and Japans recording Korean events. The obtained $Q^{-1}$ values, however, were anomalously high; these misguided values, inconsistent with tectonic activity of Korean Peninsula, seems to be related with high $Q^{-1}$ values of Japan region.

일본, 중국 등 인접 지진다발 국가에서 큰 지진동이 전파되어 오는 경우, Lg파가 최대 진폭을 갖게 되어 Lg파의 감쇠상수$(Q^{-1})$는 매우 중요한 의미를 갖게 된다. RTSM에서 보다 신뢰성있는 $Q^{-1}$값은 긴 관측점간 혹은 진원간 거리에서 얻어지므로 남한 지역의 지진의 국내관측망 및 일본 큐슈지방을 중심으로 한 일본 지진관측망 자료를 이용하였다. 그러나, 본 해석결과는 현재의 조구조 상황과 달리 한반도의 $Q^{-1}$ 값이 매우 높게 산출되었다. 이는 감쇠상수가 큰 일본 지역의 부지영향인 것으로 추정된다.

Keywords

References

  1. 정태웅, 2001, 한반도 남동부 지각의 P파 및 S파의 감쇠구조의 비교연구, 한국지구과학회지, 22, 112-119
  2. 정태웅, 2002, Reversed Two Station Method에 의한 중부지방 $Q_{Lg}\,^{-1}$ 연구, 대한지구물리학회지, 5, 211-218
  3. 정태웅, 사또 하루오, 2000, 덕정리 지진자료를 이용한 한반도 남동부지역의 고주파 P 및 S파 감쇠구조 연구, 대한지구물리학회지, 3, 193-200
  4. 정태웅, 사또 하루오, 이기화, 2001, 한반도 남동부 지역 9 관측점 자료의 확장Coda규격화법에 의한 한반도남동부지역의 $Q_{p}\,^{-1}$ 및 $Q_{s}\,^{-1}$ 연구, 한국지구과학회지, 22, 500-511
  5. Aki, K., 1980a, Scattering and attenuation of shear waves in the lithosphere, Journal of Geophysical Research, 85, 6496-6504 https://doi.org/10.1029/JB085iB11p06496
  6. Aki, K., 1980b, Attenuation of shear waves in the lithosphere for frequencies from 0.05 to 25 Hz, Physics of the Earth and Planetary Interior, 21, 50-60 https://doi.org/10.1016/0031-9201(80)90019-9
  7. Blakeslee, S., Malin, P., and Alvarez, M., 1989, Fault-zone attenuation of high-frequency seismic waves, Geophysical Research Letter, 16, 1321-1324 https://doi.org/10.1029/GL016i011p01321
  8. Bringham, E. O., 1974, The Fast Fourier Transform, Prentice- Hall, Inc., New Jersey
  9. Chun, K.-Y., West, G. F., Kokoski, R. J., and Samson, C. 1987, A novel technique for measuring Lg attenuation Results from eastern Canada between 1 to 10 Hz, Bulletin of the Seismological Society of America, 77, 398-419
  10. Chung, T. W., and Sato H., 2001a, Attenuation of highfrequency P- and S-waves in the crust of the southeastern Korea, Bulletin of the Seismological Society of America, 91, 1867-1874 https://doi.org/10.1785/0120000268
  11. Chung, T. W., and Sato H., 2001b, A preliminary study on the attenuation of high-frequency P and S waves in the crust of the Yangsan fault area, southeastern South Korea, Science Report of Thoku University, Series 5, 36, 291-294
  12. Chung, T. W., and Lee, K., 2002, Attenuation of high-frequency Lg waves around the Yangsan Fault area, the southeast Korea, Journal of Korean Geophysical Society, 5, 1-8
  13. Chung, T. W., and Lee, K. 2003, A study of high-frequency $Q_{Lg}\,^{-1}$ in the crust of south Korea, Bulletin of the Seismological Society of America, 93, 1401-1406 https://doi.org/10.1785/0120020199
  14. Chung, T. W., Park, Y. K., Kang, I. B., and Lee, K. 2005, Crustal $Q_{Lg}\,^{-1}$ in South Korea using the Source Pair/Receiver Pair method, Bulletin of the Seismological Society of America, 95, 512-520 https://doi.org/10.1785/0120030223
  15. Chung, T. W., Noh, M. H., and Matsumoto, S., 2006, The attenuation structure of the South Korea: a review, Journal of Korean Geophysical Society, 9, 199-207
  16. Chung, T. W., Noh, M. H., Kim, J. K., Park, Y. K., Yoo, H. J., and Lees, J. M., 2007, A study of the regional variation of low-frequency $Q_{Lg}\,^{-1}$ around the Korean Peninsula, Bulletin of the Seismological Society of America, 97, 2190-2197 https://doi.org/10.1785/0120070066
  17. Cooley, J. W., and Tukey, J. W., 1965, An algorithm for the machine calculation of complex Fourier series, Mathematics of Computation, 19(90), 297-301 https://doi.org/10.2307/2003354
  18. Frankel, A., McGarr, A., Bicknell, J. Mori, J., Seeber, L., and Cranswick, E., 1990, Attenuation of high-frequency shear waves in the crust: measurements from New York State, South Africa and southern California, Journal of Geophysical Research, 95, 17441-17457 https://doi.org/10.1029/JB095iB11p17441
  19. Furumura, T., and Kennett, B. L. N., 2001, Variation in regional phase propagation in the area around Japan, Bulletin of the Seismological Society of America, 91, 667-682 https://doi.org/10.1785/0120000270
  20. Jin, A., and Aki, K., 1988, Spatial and temporal correlation between coda Q and seismicity in China, Bulletin of the Seismological Society of America, 78, 741-769
  21. Kim, K. D., Chung, T. W., and Kyung, J. B., 2004, Attenuation of high-frequency P and S waves in the crust of Choongchung provinces, central south Korea, Bulletin of the Seismological Society of America, 94, 1070-1078 https://doi.org/10.1785/0120030137
  22. Kinoshita, S., 1994, Frequency-dependent attenuation of shear waves in the crust of the southern Kanto area, Japan, Bulletin of the Seismological Society of America, 84, 1387-1396
  23. Lees, J. M., and Lindley, G. T., 1994. Three-dimensional attenuation tomography at Loma Prieta: Inversion of $t^{\ast}$ for Q., Journal of Geophysical Research, 99, 6843-6863 https://doi.org/10.1029/93JB03460
  24. Nava, F. A., Garcia-Arthur, R., Castro, R. R., Suarez, C., Marquez, B., Nunez-Cornu, F., Saavedra, G., and Toscano, R., 1999, S wave attenuation in the coastal region of Jaliscco-Colima, Mexico, Physics of the Earth Planetary Interiors, 115, 247-257 https://doi.org/10.1016/S0031-9201(99)00114-4
  25. Ordaz, M., and Singh, K., 1992, Source spectra and spectral attenuation of seismic waves from Mexican earthquakes, and evidence of amplification in the hill zone of Mexico City, Bulletin of the Seismological Society of America, 82, 24-43
  26. Sato, H., and Fehler, M. C., 1998, Seismic wave propagation and scattering in the heterogeneous earth, Springer-Verlag New York, Inc. 308 pp
  27. Shih, X. R., Chun, K. Y., and Zhu, T., 1994, Attenuation of 1-6 s Lg waves in Eurasia, Journal of Geophysical Research, 99, 23859-23874 https://doi.org/10.1029/94JB02163
  28. Xie, J., Wu, Z., Liu, R., Schaff, D., Liu, Y., and Liang, J., 2006, Tomographic regionalization of crustal Lg Q in eastern Eurasia, Geophysical Research Letter, 33, L03315, doi:10.1029/2005GL024410