DOI QR코드

DOI QR Code

Moveout Velocities and Effective Anellipticity of the Crust in the Korean Peninsula

한반도 지각의 무브아웃 속도 및 유효비타원율 시험적 산출

  • Kim, Ki Young (Division of Geology and Geophysics, Kangwon National University) ;
  • Park, Iseul (Division of Geology and Geophysics, Kangwon National University) ;
  • Byun, Joongmoo (Department of Natural Resources and Environmental Engineering, Hanyang University) ;
  • Lee, Jung Mo (Department of Geology, Kyungpook National University)
  • 김기영 (강원대학교 지질.지구물리학부) ;
  • 박이슬 (강원대학교 지질.지구물리학부) ;
  • 변중무 (한양대학교 자원환경공학과) ;
  • 이정모 (경북대학교 지질학과)
  • Received : 2017.03.30
  • Accepted : 2017.04.07
  • Published : 2017.05.31

Abstract

Virtual source data were produced by applying the seismic interferometry to the 2002 experimental seismic refraction data. Using the data, moveout velocities and effective anellipticity were experimentally computed for the crust at eight sites in the Korean peninsula. The moveout velocities of reflection events at approximate Moho depths were yielded to be $6.30{\pm}0.25km/s$ using near-offset traveltimes. Expanding the Taylor approximation to the $3^{rd}$ term for far-offset traveltimes, the effective anellipticity parameters were computed to be $0.18{\pm}0.07$ for the crust material.

Acknowledgement

Supported by : 기상청, 강원대학교

References

  1. Abbad, B., Ursin, B., and Rappin, D., 2009, Automatic nonhyperbolic velocity analysis, Geophysics, 74, U1-U12. https://doi.org/10.1190/1.3273876
  2. Alkhalifah, T., 1997, Velocity analysis using nonhyperbolic moveout in transversely isotropic media, Geophysics, 62, 1839-1854. https://doi.org/10.1190/1.1444285
  3. Alkhalifah, T., and Tsvankin, I., 1995, Velocity analysis for transversely isotropic media, Geophysics, 60, 1550-1566. https://doi.org/10.1190/1.1443888
  4. Cho, H.-M., Baag, C.-E., Moon, W., Lee, J. M., Jung, H., Kim, K. Y., and Asudeh, I., 2006, Crustal velocity structure across the southern Korean Peninsula from the first crustal-scale refraction experiment, Geophysical Research Letters, 33, L06307, doi:10.1029/2005GRL025145.
  5. Cho, H.-M., Baag, C.-E., Lee, J. M., Moon, W., Jung, H., and Kim, K. Y., 2013, P- and S-wave velocity model along crustal scale refraction and wide-angle reflection profile in the southern Korean Peninsula, Tectonophysics, 582, 84-100. https://doi.org/10.1016/j.tecto.2012.09.025
  6. Crampin, S., 1984, An introduction to wave propagation in anisotropic media, Geophys. J. R. Astr. Soc., 76, 17-28. https://doi.org/10.1111/j.1365-246X.1984.tb05018.x
  7. Kim, K. Y., Lee, J. M., Moon, W., Baag, C.-E., Jung, H., and Hong, M. H., 2007a, Crustal structure of the southern Korean peninsula from seismic waves generated by large explosions in 2002 and 2004, Pure and Applied Geophysics, 164, 97-113. https://doi.org/10.1007/s00024-006-0149-4
  8. Kim, K. Y., Lee, J. M., Moon, W., Baag, C.-E., Jung, H., and Lee, S. Y., 2007b, Seismic reflection image of the crust structure along the KCRT-2002 profile in the southern Korean peninsula, Geosciences Journal, 11, 219-228. https://doi.org/10.1007/BF02913935
  9. Levin, F. K., 1978, The reflection, refraction, and diffraction waves in media with an elliptical velocity dependence, Geophysics, 43, 528-537. https://doi.org/10.1190/1.1440833
  10. Schuster, G. T., 2009, Seismic Interferometry, Cambridge University Press, 260 p.
  11. Takanashi, M., Nishizawa, O., Kanagawa, K., and Yasunaga, K., 2001, Laboratory measurements of elastic anisotropy parameters for the exposed crustal rocks from the Hidaka Metamorphic Belt, Central Hokkaido, Japan, Geophys. J. Int., 145, 33-47. https://doi.org/10.1111/j.1365-246X.2001.00332.x
  12. Taner, M. T., and Koehler, F., 1969, Velocity spectra - digital computer derivation and applications of velocity functions, Geophysics, 34, 859-881. https://doi.org/10.1190/1.1440058
  13. Tatham, R. J., and McCormack, M. D., 1991, Multicomponent seismology in petroleum exploration, Society of Exploration Geophysicists, Tulsa, 248p.
  14. Thomsen, L., 1986, Weak elastic anisotropy, Geophysics, 51, 1954-1966. (Discussion in GEO-53-04-0558-0560 with reply by author). https://doi.org/10.1190/1.1442051
  15. Tsvankin, I., and Thomsen, L., 1994, Nonhyperbolic reflection moveout in anisotropic media, Geophysics, 59, 1290-1304. https://doi.org/10.1190/1.1443686