M 4.2 Light Earthquake Recorded 72 km SW of Nikolski, Alaska

Source: USGS · Alaska

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A magnitude 4.2 earthquake occurred southwest of Nikolski, Alaska, on February 24, 2026. The shallow tremor was recorded at a depth of 10 kilometers.

What this USGS earthquake report tells you, and what most readers miss

This notice was issued by USGS on February 24, 2026 and geographically references Alaska. Its severity classification of "medium" 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 regulatory framework behind it, which shapes what remedies (refunds, replacements, recalls, evacuations) are available to affected individuals and who holds statutory responsibility for enforcement.

Most readers skim a notice like this, check whether they are personally affected, and move on. The more useful lens is to read it as a data point about the issuing system: how quickly USGS detected the hazard, how precise the geographic or product-identifier scope is, and whether similar notices have clustered in the same category or region in the last 90 days. Cluster patterns frequently precede a broader regulatory action — a single localized USGS earthquake report is isolated; three of them within a quarter often indicate a supply-chain, infrastructure, or seasonal driver that will keep producing notices until something structural changes.

For decision-making, Areazine pairs each alert with the original agency URL, the full agency name, and a timestamp so you can verify the notice against the primary source before acting on it. Tags on this item (earthquake, seismic, usgs, Alaska) map to related alerts in the same area of risk — browsing them together gives a clearer picture than any single notice alone, because the shape of an ongoing issue only becomes visible across multiple sequential alerts.

What Happened

A light earthquake with a magnitude of 4.2 (mb) occurred on February 24, 2026, at 20:15:49 UTC. The seismic event was recorded at a shallow depth of 10 kilometers. Due to its magnitude, this event is classified as a light earthquake, which typically results in noticeable shaking but rarely causes significant structural damage.

Location Details

The epicenter was located at coordinates 52.512°N and 169.6733°W, approximately 72 kilometers (44.7 miles) southwest of Nikolski, Alaska. The depth of 10 kilometers is considered shallow; shallow earthquakes (those less than 20km deep) are often felt more strongly than deeper events of the same magnitude because they occur closer to the surface.

Impact Assessment

At the time of this report, there have been no felt reports submitted to the USGS. There is no tsunami advisory, watch, or warning in effect following this event. The USGS recorded a maximum Modified Mercalli Intensity (MMI) of 2.798, which corresponds to weak shaking. No alert level color has been assigned to this routine seismic event.

What You Should Know

Light earthquakes of this magnitude are common in seismically active regions like the Aleutian Islands. While significant damage is unlikely, residents may have felt light vibrations. Aftershocks are a possibility following any seismic event, though they are typically smaller in magnitude than the initial quake. In the event of shaking, remember to "Drop, Cover, and Hold On."

Source

Data and event details provided by the USGS Earthquake Hazards Program.

Original source: USGS Official Notice ↗

All Earthquakes →

Frequently Asked Questions

Common questions about this USGS earthquake report.

What is this USGS earthquake report about?
A magnitude 4.2 earthquake occurred southwest of Nikolski, Alaska, on February 24, 2026. The shallow tremor was recorded at a depth of 10 kilometers.
Which agency issued this alert?
This alert was issued by USGS. The original notice is available at the source link at the bottom of this article.
How severe is this alert?
This alert is classified as "medium" severity. Stay informed and follow agency guidance.
What area is affected?
This alert affects Alaska. Check with USGS for the most current geographic scope.
Where can I find more Earthquakes updates?
Browse the full Earthquakes feed on Areazine at areazine.com/earthquakes/ for the latest updates from USGS and other agencies.