An earthquake of magnitude 6.4 occurred early morning on Monday, October 16th, 2023, at 2:35 am local time near Adak, Aleutians West, Alaska, USA, as reported by the United States Geological Survey.
According to preliminary data, the quake was located at an intermediate to considerable depth of 116 miles. The strength of the earthquake may have been tempered by its relative great depth below the surface, which makes it feel weaker in absolute terms.
The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.
Our monitoring service identified a second report from the German Research Centre for Geosciences (GFZ) which listed the quake at magnitude 6.4 as well. Other agencies reporting the same quake include France's Réseau National de Surveillance Sismique (RéNaSS) at magnitude 6.2, the citizen-seismograph network of RaspberryShake at magnitude 6.7, and Geoscience Australia (GeoAu) at magnitude 6.5.
Several earthquakes shook the far northern coast region of California early Monday but authorities received no reports of harm from the jolts.
A magnitude 4.8 quake struck beneath wilderness 33.7 miles south of the city of Eureka at 3:20 a.m., the U.S. Geological Survey said.
It was followed by a magnitude 4.1 offshore quake at 3:31 a.m. about 18 miles west-southwest of Eureka, a port city roughly 225 miles north of San Francisco.
There were no reports of damage or injuries from the morning’s earthquake activity, said Samantha Karges, public information officer for the Humboldt County Sheriffs Office.
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