Acoustic Images of Submarine landslide in western Sagami Bay obtained by deep sea AUV “URASHIMA” in Sagami bay

DOI Web Site 2 Citations 17 References
  • Kasaya Takafumi
    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology
  • Tsukioka Satoshi
    Marine Technology Center, Japan Agency for Marine-Earth Science and Technology
  • Yamamoto Fujio
    The Center for Deep Earth Exploration, Japan Agency for Marine-Earth Science and Technology
  • Hyakudome Tadahiro
    Marine Technology Center, Japan Agency for Marine-Earth Science and Technology
  • Sawa Takao
    Marine Technology Center, Japan Agency for Marine-Earth Science and Technology
  • Yoshida Hiroshi
    Marine Technology Center, Japan Agency for Marine-Earth Science and Technology
  • Ishibashi Shojiro
    Marine Technology Center, Japan Agency for Marine-Earth Science and Technology
  • Tahara Junichiro
    Marine Technology Center, Japan Agency for Marine-Earth Science and Technology
  • Kinoshita Masataka
    Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology
  • Aoki Taro
    Marine Technology Center, Japan Agency for Marine-Earth Science and Technology

Bibliographic Information

Other Title
  • 深海巡航AUV「うらしま」によって得られた相模湾初島沖の海底地すべり音響イメージ
  • シンカイ ジュンコウ AUV ウラシマ ニ ヨッテ エラレタ サガミワン ハツシマオキ ノ カイテイ ジスベリ オンキョウ イメージ

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Abstract

To collect bathymetric data and bottom material information, multi narrow beam echo sounder and/or side scan sonar are usually used over wide area. The autonomous underwater vehicle (AUV) has the advantage of getting closer to the sea surface as compared with a survey from the vessel. URASHIMA is a 3000 m class AUV, is loaded with multi narrow beam depth sounder, side scan sonar and sub-bottom profiler. Using URASHIMA, side scan sonar images and sub-bottom profiles were collected around off Hatsushima Island where mud flow was generated with some large earthquakes occurrence. We could obtain many enough quality side scan sonar images and sub-bottom profiles. Mosaic image was constructed by obtained side scan sonar images, and shows distinctive surface structure. Some irregular patches are detected around the mudflow area 7km off Hatsushima Island. This structure do not relate to the bathymetry obtained by SeaBat8160 on R/V Natsushima. Therefore, these are interpreted as debris generated with earthquakes. Sub-bottom profiles could detect very clear sedimentary structure.

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