HR: 1340h
AN: OS33B-0584    [Abstracts]
TI: Morphotectonic fabrics of major spreading centers, subduction zones and transform faults in the southern hemisphere -Beagle 2003 cruise by R/V {\it Mirai} the round trip in the southern hemisphere-
AU: * Tokunaga, W
EM: tokunaga@godi.co.jp
AF: GLOBAL OCEAN DEVELOPMENT INC., 13-8, Kamiookanishi 1-chome Konan-ku, Yokohama, 233-0002 Japan
AU: Fujioka, K
EM: fujioka@godi.co.jp
AF: GLOBAL OCEAN DEVELOPMENT INC., 13-8, Kamiookanishi 1-chome Konan-ku, Yokohama, 233-0002 Japan
AU: Kimura, R
EM: kimura@godi.co.jp
AF: GLOBAL OCEAN DEVELOPMENT INC., 13-8, Kamiookanishi 1-chome Konan-ku, Yokohama, 233-0002 Japan
AU: Okumura, S
EM: okumura@godi.co.jp
AF: GLOBAL OCEAN DEVELOPMENT INC., 13-8, Kamiookanishi 1-chome Konan-ku, Yokohama, 233-0002 Japan
AU: Fujiwara, T
EM: toshi@jamstec.go.jp
AF: Japan Agency for Marine-Earth, 2-15, Natsushima-cho, Yokosuka, 237-0061 Japan
AB: Precise bathymetric surveys of the world ocean has been made it possible to establish continental drift, sea-floor spearheading and plate tectonics. However the data have mostly been restricted from the oceans in the northern hemisphere. The precise submarine bathymetric data from the southern hemisphere are quite scarce because of the long distance from the major countries and of being always severe sea conditions with bad weather for the bathymetric swath mapping. Well-surveyed areas of the southern hemisphere are the Indian triple junction, SW and SE Indian Ridges, Southern East Pacific Rise from 13\deg S to 20\deg S and Scotia arc-trench-backarc system. We had not been known about the vast area of the southern hemisphere. We had a bathymetric survey around the southern hemisphere during the cruise of BEAGLE 2003. The project BEAGLE 2003 started from Brisbane, on 2003 Aug and ended at Fremantle, on Feb 2004 with a great success. In the South Pacific Ocean the line crosses on the 28\deg S - 32.5\deg S latitude from Brisbane to Valparaiso via Papeete and in the South Atlantic Ocean on the 30\deg S latitude from Santos to Cape Town and in the Indian Ocean on the 20\deg S latitude from Madagascar to Fremantle via Mauritius Island, respectively. We had a precise bathymetric survey by using the narrow multi beam system (SeaBeam 2112) that is installed in the JAMSTEC R/V {\it Mirai}. Bathymetric survey lines cross the Tonga-Kermadec Arc-Trench and backarc system, Louisville Ridge, East Pacific Rise spreading center, Peru-Chile Trench, southern Mid-Atlantic Ridge, Central Indian Ridge, Ninety East ridge and many other oceanic plateaus and seamounts. We had obtained a narrow band data on the morphologic features of the ridges, trenches, seamounts and oceanic plateaus and we compared the data with those from ETOPO2 that was distributed by Sandwell and Smith (1996). These data offer significant information on the plate tectonics and plume tectonics if we think about the morphology on the global scale.
DE: 9800 GENERAL OR MISCELLANEOUS
DE: 8150 Plate boundary--general (3040)
DE: 3035 Midocean ridge processes
DE: 3045 Seafloor morphology and bottom photography
DE: 3099 General or miscellaneous
SC: Ocean Sciences [OS]
MN: 2004 AGU Fall Meeting