M 3.6 Minor Earthquake Strikes Near Susitna, Alaska

Source: USGS · Alaska

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A magnitude 3.6 earthquake occurred at an intermediate depth of 69.7 km near Susitna, Alaska, on March 18, 2026.

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

This notice was issued by USGS on April 4, 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 3.6 ml was recorded on March 18, 2026, at 16:30:38 UTC. The event occurred approximately 15 km west-northwest of Susitna, Alaska, and was automatically processed by the USGS seismic network.

Location Details

The seismic activity was centered at coordinates 61.614°N and 150.763°W. The earthquake originated at a depth of 69.7 km. This is classified as an intermediate-depth earthquake (20-70 km), which generally results in less intense shaking at the surface compared to shallower events of a similar magnitude.

Impact Assessment

At the time of reporting, there are no felt reports associated with this event. There is no tsunami advisory, watch, or threat in effect (tsunami: 0). No alert level color has been assigned to this event, and there are no reports of damage or injuries.

What You Should Know

Earthquakes with magnitudes between 2.5 and 3.9 are classified as minor. While these events are often felt by residents near the epicenter, they rarely cause structural damage. Residents in the region should be aware that routine seismic activity can include aftershocks, though they are typically smaller than the initial event.

Source

Data 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 3.6 earthquake occurred at an intermediate depth of 69.7 km near Susitna, Alaska, on March 18, 2026.
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.