Nearly 200 people from as far away as San Diego and Camp Verde, Arizona, had reported feeling the tremor to the agency as of 6:30 a.m.
Magnitude measures the energy released at the source of the earthquake, the U.S. Geological Survey says. It replaces the old Richter scale.
If an earthquake strikes, it's best to protect yourself right away. Here are tips from experts: drop, cover and hold on.
Earthquakes' sudden, rapid shaking can cause fires, tsunamis, landslides or avalanches. They can happen anywhere, but they're most common in Alaska, California, Hawaii, Oregon, Puerto Rico and Washington.
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