Geoacoustic Characteristics of P-Wave Velocity in Donghae City - Ulleung Island Line, East Sea: Preliminary Results

동해시-울릉도 해저 측선에서의 P파 속도 지음향 특성: 예비 결과

  • Ryang, Woo-Hun (Division of Science Education / Institute of Science Education, Chonbuk National University) ;
  • Kwon, Yi-Kyun (Petroleum and Marine Resources Division, Korea Institute of Geoscience and Mining Resources (KIGAM)) ;
  • Jin, Jae-Hwa (Petroleum and Marine Resources Division, Korea Institute of Geoscience and Mining Resources (KIGAM)) ;
  • Kim, Hyun-Tae (Petroleum and Marine Resources Division, Korea Institute of Geoscience and Mining Resources (KIGAM)) ;
  • Lee, Chi-Won (Petroleum and Marine Resources Division, Korea Institute of Geoscience and Mining Resources (KIGAM)) ;
  • Jung, Ja-Hun (Department of Exploration Engineering, Pukyong National University) ;
  • Kim, Dae-Choul (Department of Exploration Engineering, Pukyong National University) ;
  • Choi, Jin-Hyuk (Agency for Defense Development) ;
  • Kim, Young-Gyu (Agency for Defense Development) ;
  • Kim, Sung-Il (Agency for Defense Development)
  • Published : 2007.06.30

Abstract

Donghae City - Ulleung Island Line (DC-UI Line) is a representative line for underwater and geoacoustic modeling in the middle western East Sea. In this line, an integrated model of P-wave velocity is proposed for a low-frequency range target (<200 Hz), based on high-resolution seismic profiles (2 - 7 kHz sonar and air-gun), shallow and deep cores (grab, piston, and Portable Remote Operated Drilling), and outcrop geology (Tertiary rocks and the basement on land). The basement comprises 3 geoacoustic layers of P-wave velocity ranging from 3750 to 5550 m/s. The overlying sediments consist of 7 layers of P-wave velocities ranging from 1500 to 1900 m/s. The bottom model shows that the structure is very irregular and the velocity is also variable with both vertical and lateral extension. In this area, seabed and underwater acousticians should consider that low-frequency acoustic modeling is very range-dependent and a detailed geoacoustic model is necessary for better modeling of acoustic propagation such as long-range surveillance of submarines and monitoring of currents.

Keywords

References

  1. L, Hampton, Physics of Sound in Marine Sediments (Plenum Press, New York, 1974)
  2. N,G. Pace, Acoustics and the Sea-bed (Bath Univ, Press, Bath, 1983)
  3. R,D, Stoll, Sediment Acoustics (Springer-Verlag, Berlin, 1989)
  4. J,M, Hovem, M,D, Richardson, and R.D, Stoll, Shear Waves in Marine Sediments (Kluwer Academic Pubs, Dordrecht, 1990
  5. R. Chapman, S. Chin-Bing, D. King, and R. Evans, 'Geoacoustic inversion in range-dependent shallow-water environments,' IEEE Journal of Oceanic Engineering 28, 317-319, 2003 https://doi.org/10.1109/JOE.2003.816685
  6. J. F. Lynch and P. H. Dahl, 'Science and engineering advances in exploring the Asian Marginal Seas,' IEEE Journal of Oceanic Engineering 29, 919, 2004 https://doi.org/10.1109/JOE.2004.841419
  7. E.L. Hamilton, 'Geoacoustic modeling of the sea floor,' Journal of Acoustical Society of America 68, 1313-1339, 1980 https://doi.org/10.1121/1.385100
  8. P. Abbot, 'Effects of Korean Iittoral environment on scoustic propagation', IEEE Journal of Oceanic Engineering 26, 266-284, 2001 https://doi.org/10.1109/48.922793
  9. C. W. Lee and 25 other, Seismic Stratigraphy and Deep Coring in the Major Harbours (Agency for Defence Development, Report NSDC-408-010302, 2001), (in Korean with English abstract)
  10. S. H. Lee, Depositional Processes of Quaternary Sediments in the Ulleung Basin, South Korea Plateau, Ulleung Interplain Gap and Oki Bank, East Sea: Chirp (2-7 kHz) Profiles (Ph.D. thesis, Seoul National University, Seoul, 2001)
  11. S.H. Lee and S.K. Chough, 'High-resolution (2-7 kHz) acoustic and geometric characters of submarine creep deposits in the South Korea Plateau, East Sea,' Sedimentology 48, 629-644, 2001 https://doi.org/10.1046/j.1365-3091.2001.00383.x
  12. S. H. Lee, S.K. Chough, G. G. Back, and Y. B. Kim, 'Chirp (2-7-kHz) echo characters of the South Korea Plateau, East Sea: styles of mass movement and sediment gravity flow,' Marine Geology 184, 227-247, 2002 https://doi.org/10.1016/S0025-3227(01)00283-3
  13. Y. K. Kwon, I. Sequence Stratigraphy of the Taebaek Group (Cambrian-Ordovician), Mideast Korea and II. Seismic Stratigraphy of the Western South Korea Plateau, East Sea (Ph.D. thesis, Seoul National University, Seoul, 2005)
  14. Y. K. Kwon, 'Seismic stratigraphy of the western South Korea Plateau, East Sea (Sea of Japan),' Island Arc, in review, 2007
  15. F. Birch, 'The velocity of compressional waves in rocks up to 10 kilobars,' Journal of Geophysical Research 65, 1083-1102, 1960 https://doi.org/10.1029/JZ065i004p01083
  16. D.C. Kim, G.Y. Kim, Y.K. Seo. D.H. Ha, I.C. Ha, Y.S. Yoon, and J.C. Kim, 'Automated velocity measurement techniques for unconsolidated marine sediment', The Sea, Journal of the Korean Society fo Oceanography 4, 400-404, 1999. (in Korean with English sbstract)
  17. Y.K. Seo and D.C. Kim, 'Acoustic property of sandy sediment in the Korea Strait using sediment sound velocimeter', The Journal of the Acoustical Society of Korea 19, 77-85, 2000. (in Korean with English abstract)
  18. H. Medwin, 'Speed of sound in water: a simple equation for realistic parameters', Journal of Acoustical Society of America 58, 1318-1319, 1975 https://doi.org/10.1121/1.380790
  19. C.S. Clay and H. Medwin, Acoustical Oceanography: Principles and Applications (John Wiley & Sons, New York, 1977)
  20. E.L. Hamilton, Geoacoustic models of the sea floor. In: Hampton, L. (ed.), Physics of Sound in Marine Sediments (Plenum Pub., New York, 1974), pp.181-221