READ MORE: Japan earthquake: how big was it? - World Watch - CBS News: "The U.S.G.S. calculated Friday's magnitude 8.9 earthquake in Japan to be 1,000 times stronger than Haiti's recent magnitude 7.0 earthquake, which devastated Port-au-Princeand killed more than 300,000 people.
When comparing to the 1906 earthquake, the U.S.G.S. has figured that Japan's earthquake is equivalent to 30 of the San Francisco earthquakes. That earthquake, a magnitude 7.7, struck just after 5 in the morning on April 18th. It killed more than 3,000 people and left 225,000 homeless. A total of 28,000 buildings were destroyed"
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