Roads Torn Up, Thousands Without Power After Northern California Shaken by 6.4-Magnitude Quake

The San Andreas fault, which runs the length of California, is said by seismologists to be “overdue” for a massive earthquake, which hasn’t happened in more than 160 years. The fault has suffered several strong earthquakes, but not the “big one” of magnitude 7.8 or higher, which would devastate the densely populated region.