M 3.3 Earthquake 33 km SE of Chickaloon, Alaska
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A magnitude 3.3 ml earthquake struck 33 km southeast of Chickaloon, Alaska, at a depth of 18.9 km.
What this USGS earthquake report tells you, and what most readers miss
This notice was issued by USGS on August 20, 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 magnitude 3.3 ml earthquake occurred on August 20, 2026 at 12:38:28 UTC. The event was located 33 km SE of Chickaloon, Alaska, at a depth of 18.9 km.
Location Details
The earthquake was centered at latitude 61.57, longitude -148.049. This places it 33 km southeast of Chickaloon, Alaska. The depth of 18.9 km classifies it as shallow (less than 20 km).
Impact Assessment
No felt reports were recorded. There was no tsunami advisory (tsunami flag: 0) and no alert level was issued.
What You Should Know
This was a minor earthquake (M 2.5-3.9). Such events are often felt but rarely cause damage. Aftershocks are possible following any earthquake.
Source
Original source: USGS Official Notice ↗
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Common questions about this USGS earthquake report.