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LOS ANGELES — If Southern Californians have been feeling more shaking this year, it’s not their imaginations.
The number of earthquakes greater than magnitude 4.0 in Southern California and Baja California has increased significantly in 2010. There have been 70 such quakes so far this year, the most of any year in the last decade. And it’s only April. There were 30 in 2009 and 29 in 2008.
Seismologists said they are studying the uptick but cannot fully explain it.
