M 3.9 - 193 km SE of Perryville, Alaska
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A magnitude 3.9 earthquake occurred 193 km southeast of Perryville, Alaska, at a depth of 23.3 km.
What this USGS earthquake report tells you, and what most readers miss
This notice was issued by USGS on August 13, 2026 and geographically references Alaska. Its severity classification of "low" signals how the issuing agency weighs the risk of harm if no action is taken - "critical" and "high" tier alerts typically carry direct consumer actions, while "medium" and "low" tend toward informational guidance or monitoring advisories. The category it belongs to - Earthquakes - determines the monitoring protocol behind it, which shapes what follow-up action (checking for structural damage, watching for aftershocks, reviewing local building codes) is relevant and which agency holds authority over the assessment.
Most readers skim a notice like this, check whether they are personally affected, and move on. The more useful lens is to verify its scope, source, and timestamp, then compare related notices without assuming that one record proves a broader trend.
Areazine pairs this record with the original agency URL so you can check the primary source before acting. Its related labels are earthquake, seismic, usgs, Alaska.
What Happened
A M 3.9 ml earthquake struck at 1785989508269 (UTC), located 193 km SE of Perryville, Alaska. The event had a depth of 23.3 km.
Location Details
The earthquake was centered at latitude 54.772, longitude -156.848. This depth of 23.3 km falls in the intermediate range (20-70 km).
Impact Assessment
No felt reports were recorded. The Modified Mercalli Intensity was measured at 1.369. No tsunami advisory was issued (tsunami field: 0) and no alert level was assigned.
What You Should Know
This was a minor earthquake (M 2.5-3.9 range), which is often felt but rarely causes damage. Aftershocks are possible following any seismic event.
Source
USGS Event Page - Data from USGS
Original source: USGS Official Notice ↗
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Common questions about this USGS earthquake report.