Update on the 6.4 earthquake and an explanation of the Cascadia Subduction Zone and tsunami risks.
Tuesday December 20 at 2.34am, a 6.4 earthquake struck the Northern California region of Humboldt County, 260 miles North of San Francisco. The region has experienced 40 plus magnitude 6 to 7 quakes in the last 100 years, but Tuesday's temblor was one of the most violent. Dr. Dengler gives us a thorough explanation.
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