What to know about ‘doublet' earthquakes like the destructive pair that hit Venezuela

What to know about ‘doublet' earthquakes like the destructive pair that hit Venezuela
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The second earthquake that hit Venezuela on Wednesday started rumbling before the first had even concluded. Their onsets were separated by just 39 seconds. The U.S. Geological Survey has described the pair of earthquakes — a 7.1-magnitude and a 7.5-magnitude — as a doublet sequence, a phenome...