M 3.3 Earthquake Strikes Near McCarthy, Alaska

Source: USGS · Alaska

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A minor 3.3 magnitude earthquake was recorded 48 km southwest of McCarthy, Alaska, on March 20, 2026. The shallow seismic event occurred at a depth of 7.1 kilometers.

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

This notice was issued by USGS on April 3, 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 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 minor earthquake with a magnitude of 3.3 ml occurred on March 20, 2026, at 14:59:04 UTC. The event was centered approximately 48 km southwest of McCarthy, Alaska. The earthquake was recorded by the USGS and has been reviewed by seismologists.

Location Details

The seismic activity was located at coordinates 61.13°N and 143.565°W. The earthquake originated at a depth of 7.1 km. This is classified as a shallow earthquake, as it occurred less than 20 km below the Earth's surface. Shallow quakes are typically more noticeable to those nearby than deeper events of the same magnitude.

Impact Assessment

According to the USGS data, the event reached a maximum estimated intensity of MMI 3.43. There were no immediate reports of the earthquake being felt by the public at the time of the report, and no tsunami advisory, watch, or warning was issued. No alert level color was assigned to this routine seismic event.

What You Should Know

Earthquakes with magnitudes between 2.5 and 3.9 are categorized as minor. While these events are often felt by residents near the epicenter, they rarely cause any structural damage. Residents in the region should be aware that aftershocks are possible following any seismic event, though they are generally smaller in magnitude than the initial quake.

Source

Data and attribution for this report are provided by the USGS.

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 minor 3.3 magnitude earthquake was recorded 48 km southwest of McCarthy, Alaska, on March 20, 2026. The shallow seismic event occurred at a depth of 7.1 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 "low" severity. No immediate action required, but stay aware.
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.