A camera on an NHK helicopter captured images of tsunami waves flowing upstream near the mouth of a river in Kamogawa, Chiba Prefecture, at around 2:50 PM on Sunday.
The same phenomenon was observed after a major earthquake that hit central Japan in 1983 and a massive quake that struck off Tokachi in Japan's northernmost prefecture of Hokkaido in 2003.
Associate Professor Yoshinobu Tsuji of the University of Tokyo's Earthquake Research Institute says tsunami-triggered rapid fluctuations in tide levels may have caused the tsunami to flow upstream.
The expert says tsunami waves could travel upstream for several kilometers, capsizing boats.
He says he has never heard of this happening in a river in the Kanto regio
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