Seismologists rumble over quake clusters

Japan tremor may be part of a second grouping of great quakes

4:11pm, April 15, 2011

Japan’s catastrophic March 11 earthquake was the biggest ever recorded in Japan and the costliest natural disaster in history, but in a way it was nothing new. Three other quakes of magnitude 8.6 or greater have struck worldwide in the past seven years — after a gap of four decades.

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