Northern Californias biggest earthquake in 25 years has people asking: Is the world seeing more tremors than usual? And is the long-dreaded "Big One" that could devastate California coming soon? Actually, experts say the world might not be seeing more than usual. And as for the Big One, theres no sign that its imminent. The infamous San Andreas Fault is due for its epic every-150-years rumble. But the quake that struck Sunday, centered about 6 miles southwest of Napa, wasnt on that line.
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