HR: 1340h
AN: OS33B-1478    [Abstracts]
TI: BSR pull-up phenomena in the Kumano Basin
AU: * Saeki, T
EM: saeki-tatsuo@jogmec.go.jp
AF: JOGMEC, 2-2-1,Hamada,Mihama-ku, Chiba, 261-0025 Japan
AU: Inamori, T
EM: inamori-takao@jogmec.go.jp
AF: JOGMEC, 2-2-1,Hamada,Mihama-ku, Chiba, 261-0025 Japan
AU: Morita, S
EM: morita-s@aist.go.jp
AF: AIST, 1-1-1,Higashi, Tsukuba, 305-8567 Japan
AU: Nagakubo, S
EM: nagakubo-sadao@jogmec.go.jp
AF: JOGMEC, 2-2-1,Hamada,Mihama-ku, Chiba, 261-0025 Japan
AB: Conventionally, the BSR (bottom simulating reflector), which is considered to be a bottom of the gas hydrate bearing sediment, has been used for delineation of horizontal distributions of gas hydrate layers and their base structures. Through the BSR interpretation study of the Kumano Basin in the Eastern Nankai Trough, Japan using the 3D seismic cube, BSR pull-up phenomena were detected. Most remarkable BSR pull-up phenomenon occurred in the small circle area of which diameter was 400m and its center was closed to the sea-floor in which the pock-mark existed. Strictly speaking, the pull-upped reflector can_ft be called as the BSR, because it dose not simulate the sea-bottom. However, it may suggest the local change of the phase boundary depth due to the thermal condition or some other reasons. At the meeting, we will show details of phenomena and technical discussions.
DE: 3000 MARINE GEOLOGY AND GEOPHYSICS
DE: 3004 Gas and hydrate systems
DE: 3025 Marine seismics (0935, 7294)
SC: Ocean Sciences [OS]
MN: Fall Meeting 2005