Short Sharp Science: Japan's quake updated to magnitude 9.0

READ MORE: Short Sharp Science: Japan's quake updated to magnitude 9.0: "Seismologists at the US Geological Survey in Menlo Park, California, have just revised their calculations regarding the magnitude of today's quake. They now say it was magnitude 9.0. Already one of the top 10 recorded earthquakes in history, the revision suggests the quake was even more powerful than first thought."