| http://www.w3.org/ns/prov#value | - Big earthquakes over the last 30 years have not triggered global chains of massive seismic activity, U.S. scientists reported on Monday.But major quakes do trigger other big ones close by and smaller ones far away, researchers said.The news is reassuring for California and other quake-prone areas wondering if the 9.0 earthquake which has done so much harm in Japan could hasten troubles outside the
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