7.4-magnitude quake strikes Fukushima prefecture in Japan - Tsunami waves from 30cm to 1.4m seen

A 7.4-magnitude quake struck Fukushima prefecture in Japan and gave rise to Tsunami waves from 30cm to 1.4m seen but, a Tsunami warning issued earlier was later downgraded. Residents were, however, urged to "evacuate immediately".
The earthquake shook buildings in Tokyo, 240 kilometres southwest of the epicentre. Warnings had been issued for waves of up to 3m, but the Pacific Tsunami Warning Centre has indicated that the tsunami threat has passed. There were, of course, the chance of fluctuations in sea levels along some coasts and people should remain alert.
This has been reported in nzherald.co.nz dated 22 November 2016.

Officials in Japan are keeping alerts in place because the danger is not over and sea levels are still rising. As a precautionary measure, the cooling system of the number 3 reactor at the Fukushima power plant was temporarily shut down but has, later, been restored. The reactor temperature is under control.
Incidentally, the magnitude of the quake, which struck at 6am Japan time, was initially put at 7.3, before being revised down to 6.9 and then up again to 7.4 - at a depth of 25km.
Earthquakes are common in Japan since it is one of the world's most seismically active areas. It accounts for about 20 per cent of the world's earthquakes of magnitude 6 or greater. It may be recalled that on March 11, 2011, the quake that struck Fukushima was of magnitude 9 - the strongest quake in Japan on record. It triggered a massive Tsunami and resulted in triggering the world's worst nuclear crisis since Chernobyl a quarter of a century earlier.


Image courtesy wikimediacommons.org


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