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Geosciences Journal

, Volume 3, Issue 1, pp 17–22 | Cite as

P-wave velocity structure of upper crust in the vicinity of the Yangsan Fault region

  • Woohan KimEmail author
Article

Abstract

This study presents the P-wave velocity structure of the upper crust in the vicinity of the Yangsan Fault region based on travel-time inversion of thirty-five digital secmic records obtained by the Korea Institute of Geology, Mining and Materials (KIGAM). The present model consists of 8 horizontal layers with constant velocity in the subsurface depth of 18 km. Two-point ray tracing is applied for travel-time inversion and determination of hypocenteral parameters of the earthquakes to reduce errors resulting from ray path. The computational results of travel-time inversion show that (1) a velocity gradient with depth is nearly constant in the subsurface depth of 8 km, (2) a low-velocity zone exists in the depth between 10 and 15 km, and (3) a relatively large velocity discontinuity appears at about 15 km.

Key words

velocity structure travel-time inversion two-point ray tracing hypocenteral parameters 

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References

  1. Bessonova, E.N., Fishman, V.M., Ryaboi, V.Z. and Sitnikova, G.A., 1974, The tau method for inversion travel time—deep seismic sounding data. Geophysical Journal of Royal Astronomical Society, 36, 377–398.Google Scholar
  2. Diebold, J.B. and Stoffa, P.L., 1981, The travel time equation, tau-p mapping, and inversion of common midpoint data. Geophysics, 46, 238–254.CrossRefGoogle Scholar
  3. Han, U. and Keehm, Y., 1996, A study on the heat flow distribution in the Korean Peninsula and its vicinity. Journal of the Geological Society of Korea, 32, 267–275.Google Scholar
  4. Ham, I.K. and Kim, W., 1999, Travel time inversion using two point ray tracing in the layered media with constant or linearly varying velocity function. (in preparation)Google Scholar
  5. Johson, L. and Gilbert, F., 1972, A new datum for use in body wave travel time inversion problem. Geophysical Journal of Royal Astronomical Society, 30, 373–380.Google Scholar
  6. Kennet, B.L.N., 1976, A comparison of travel time inversion. Geophysical Journal of Royal Astronomical Society, 44, 517.Google Scholar
  7. Kim, S.G. and Lee, S.K., 1996, Seismic velocity structure in the central Korean Peninsula using the artificial explosions. Bulletin Seismological Association of the Far East, 1, 4–17.Google Scholar
  8. Kim, S.J., 1983, A Study on the Crustal Structure of South Korea Using Seismic Waves. M.S. thesis, Hanyang University, Seoul. (in Korean with English abstract)Google Scholar
  9. Kim, S.K. and Jung, B.H., 1985, The crustal structure of the southern part of the Korean Peninsula. Journal of Korean Institute of Mining Geology 18, 151–157. (in Korean with English abstract)Google Scholar
  10. Kim, S.K., 1995, A study on the crustal structure of the Korean Peninsula. Joururnal of Geological Society of Korea, 31, 393–403. (in Korean with English abstract)Google Scholar
  11. Kim, W. and Baag, C.-E., 1999, Rapid and accurate two point ray tracing in the layered media with constant or linearly varying velocity function. (in preparation)Google Scholar
  12. Lee, K., 1979, On the crustal structure of the Korean Peninsula. Journal of Geological Society of Korea, 15, 134–150.Google Scholar
  13. Lim, J.U., 1995, Geothermal potential in the Republic of Korea. In: Gupta, M.L. and Yamano, M. (eds.), Terrestrial Heat Flow and Geothermal Energy in Asia. Oxford and IBH Publishing Company, New Delhi, p. 435–467.Google Scholar
  14. Lim, J.U. and Kim, H.C., 1997, Heat flow in south Korea. Coordinating Committe for Coastal and Offshore Geoscience Programs in East and South East Asia (C.C.O.P.) Technical Bulletin, 26, 85–91.Google Scholar

Copyright information

© Springer 1999

Authors and Affiliations

  1. 1.Department of Earth and Environmental ScienceGyeongsang National UniversityJinjuKorea

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