Large quakes can trigger others around the globe
Posted on September 27, 2012 by Kate Taylor
Very large earthquakes like last April's Sumatra quake can set off others around the world for at least a week, including one as far away as Baja California.The Sumatra quake, a magnitude 8.6 temblor, did little damage, but was the tenth largest in the last 100 years. Like some other recent large quakes, it triggered small quakes during the three hours it took for seismic waves to travel through the Earth's crust.
But according to seismologists from the University of California, Berkeley, and the US Geological Survey (USGS), it had longer-term effects too, triffering some faults to break up six days later.










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