
Ask a Seismologist: What are Your Earthquake Questions?
KQED's Forum
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How Are Epicenters Determined in an Earthquake?
There's always way more small ones than there are big ones. California averages about three magnitude fives a year. The distribution within the rate is random, let me go to Sonoma County and see if I can feel this one. And then you're up in Cape Mendocino, some of the time they're down for weeks at a time. It was like seven miles from the epicenter on September 13th but it was only a four B value.
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