A Japanese geologist said Tuesday that a massive earthquake-generated tsunami originating in Japan and capable of affecting Taiwan is likely to occur every 1,000 years, a prediction likely to worry antinuclear activists who have been campaigning for the abolition of nuclear energy on the earthquake-prone island.

Yoshinobu Tsuji of the University of Tokyo's Earthquake Research Institute said in Taipei that Taiwan has very few recorded tsunami but they can be categorized into two kinds.

The first covers tsunami caused by earthquakes originating off the island's northeastern coast. The last recorded tsunami of this kind occurred in 1867.