They've been revising some estimates for potential future tsunamis in Japan, in light of last year's experience, and the results sound remarkable:
Wide swaths of the Pacific coastline stretching from Honshu to Shikoku may be hit by tsunami over 20 meters high if a newly feared megaquake occurs in the Nankai Trough, a Cabinet Office panel warned Saturday.
The new warning comes after the panel revised its 2003 estimate to reflect new findings from the March 2011 earthquake and tsunami that devastated the Tohoku region's coastline last year.
The 2003 report said no areas would see tsunami higher than 20 meters. The updated report is based on the assumption that the earthquake will have a magnitude of 9.0.
The tidal waves generated by the Nankai Trough temblor would slam areas from Kanto to Kyushu, with waves of up to 34.4 meters likely in Kuroshio, Kochi Prefecture, and between 10 and 20 meters in parts of Shizuoka, Kochi and Miyazaki prefectures.
Urban areas of Tokyo would see tsunami up to 2.3 meters high, but the village of Niijima in the Izu Island chain, which is administered by Tokyo, could face deadly waves up to 29.7 meters high, the panel said.
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