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wood and plastic bags, were found. During transects DT-10C and DT-11C, near a submarine
valley off Iwate, many differently sized items
of debris were observed clumped together as
shown in Fig. 2 .
During the cruise from July 31 to August 7,
2012, marine debris were found at 3000 m depth
in the Japan Trench area, more than 200 km from
land, using the YKDT deep-tow camera (nos.
7–13 in Table 1 ). A fi shing net, cans, plastic bags,
and sunken wood were scattered over an area of
seafl oor (Fig. 3 ). The origin of these debris could
not be determined as to whether it was related to
the tsunami event or not. At a shallower study site
Fig. 2 Accumulated
marine debris in a
submarine valley (Deep
Tow 10C image)
Fig. 3 Cans observed near
the trench
Distribution of the Marine Debris on Seafl oor from the Primary Report of Five…