The Journal of the Acoustical Society of Korea

The Acoustical Society of Korea (한국음향학회)
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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
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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

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