From the Wash Post: Southern California reels from magnitude 7.1 quake. Some details:

LOS ANGELES — A quake with a magnitude of 7.1 jolted much of California, cracking buildings, setting fires, breaking roads and causing several injuries while seismologists warned that large aftershocks were expected to continue for days, if not weeks.

The Friday night quake — preceded by Thursday’s 6.4-magnitude temblor in the Mojave Desert — was the largest Southern California quake in at least 20 years and was followed by a series of large and small aftershocks, including a few above magnitude 5.0. There is about a 1-in-10 chance that another 7.0 quake could hit within the next week, said Lucy Jones, a seismologist at the California Institute of Technology and a former science adviser at the U.S. Geological Survey.

Here is a more dramatic account from CNN: A second earthquake hit Southern California in as many days. It’s five times bigger than Thursday’s
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NOTE: Several years ago, the Diva and some colleagues prepared a time line chart titled Earthquake Planning In CA (1906-2008). You can tell at a glance that there has been an unusually long period of no major earthquakes. Plus the chart provides a lot of background about related actions in the past century.