Earthquakes low

M 3.6 - 163 km WSW of Adak, Alaska

Source: USGS · Alaska

A magnitude 3.6 earthquake was recorded by USGS near 163 km WSW of Adak. On the USGS Earthquake Hazards Program scale, M3.6 is classified "Minor". Among the 1,740 earthquake reports Areazine has published, this M3.6 event ranks stronger than 36% of them (rank #1,059 by magnitude).

This earthquake report, quickly

Magnitude
M 3.6
USGS class
Minor
Location
163 km WSW of Adak
Archive rank
#1,059 of 1,740
Source
USGS
Published
September 15, 2026
MINOR

Stronger than 36% of the 1,740 earthquake reports in Areazine's archive, weaker than 1,058 others.

Record status: a point-in-time USGS detection. Aftershocks, revised magnitude, and felt-report data continue to update on USGS's own event page after publication.

What Happened

A M 3.6 ml earthquake occurred at 163 km WSW of Adak, Alaska, on 2026-10-15 at 12:30:19 UTC. The event had a depth of 20.9 km.

Location Details

The earthquake was located at latitude 51.121, longitude -178.661. This places it 163 km west-southwest of Adak, Alaska. The depth of 20.9 km is classified as intermediate (20-70 km).

Impact Assessment

No felt reports were recorded. There was no tsunami advisory (tsunami: 0). The maximum modified Mercalli intensity was 3.112, and no alert level was issued.

What You Should Know

Earthquakes of this magnitude (M 2.5-3.9) are often felt but rarely cause damage. Minor aftershocks are possible following the event.

Source

https://earthquake.usgs.gov/earthquakes/eventpage/aka2026shxzeg (USGS)

Original source: USGS Official Notice ↗

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Elsewhere in the country: similar length or severity timing 8

Beyond this USGS earthquake report's own category, Areazine surfaces two nationwide peer sets: length-matched and severity/date-matched notices from elsewhere in the archive, distinct from the same-feed Related list above.

Similar body length

Nearest notices by article body length (768 characters here).

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Similar severity timing

Same severity (low) notices issued closest in time to September 15, 2026.

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Common Questions

Questions readers often have about this USGS earthquake report.

How strong was this earthquake? ▾
A magnitude 3.6 ml earthquake struck 163 km west-southwest of Adak, Alaska, at a depth of 20.9 km.
How should a magnitude 3.6 ("Minor") event be understood? ▾
The USGS classifies M3.6 as "Minor" on its Earthquake Hazards Program scale. Events in this range are often felt near the epicenter and can cause minor damage to vulnerable structures, though widespread damage is uncommon.
How does this compare with other earthquakes Areazine has reported? ▾
This is the #1,059 strongest of the 1,740 earthquake reports in Areazine's archive by magnitude, stronger than 36% of them and weaker than 1,058 others.
Was Adak likely to feel this earthquake? ▾
This event was centered 163 km WSW of Adak. Shaking intensity falls off sharply with distance from the epicenter and depends on depth and local geology, so check the USGS "Did You Feel It?" report for this event for real felt-shaking data rather than assuming from magnitude and distance alone.

Where this data comes from

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National Weather Service

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CDC Air Quality & Health

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