00:00Northern California was hit by two earthquakes Wednesday evening.
00:03They struck just 44 seconds apart.
00:06The first earthquake measured magnitude 3.8.
00:09It hit about 15 miles west of Petrolia.
00:12That is in Humboldt County, California.
00:14Less than one minute later, a second magnitude 3.6 earthquake struck nearby.
00:19The USGS calls this a seismic doublet.
00:22A doublet involves similarly sized earthquakes.
00:24They occur close together in time and location.
00:27There is no strict rule for defining one.
00:30Scientists say doublets are uncommon, but they are not considered rare.
00:34One notable doublet occurred in Venezuela this June.
00:37A magnitude 7.2 quake struck first near San Felipe.
00:41About 30 seconds later, a magnitude 7.5 earthquake struck northern Venezuela.
00:46That powerful doublet caused more than 6,000 deaths.
00:50More than 1,6500 people were injured.
00:53Northern California's earthquakes were much smaller.
00:55But the region remains seismically active.
00:58The USGS continues monitoring earthquake activity.
01:01Disclosure.
01:02This video contains stock footage and content created or enhanced using AI-assisted tools AI generated.
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