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M 3.7 Earthquake 37 km SW of Karluk, Alaska

Source: USGS · Alaska

A magnitude 3.7 earthquake was recorded by USGS near 37 km SW of Karluk. On the USGS Earthquake Hazards Program scale, M3.7 is classified "Minor". Among the 1,782 earthquake reports Areazine has published, this M3.7 event ranks stronger than 39% of them (rank #1,042 by magnitude).

30 seconds on this earthquake report

Magnitude
M 3.7
USGS class
Minor
Location
37 km SW of Karluk
Archive rank
#1,042 of 1,782
Source
USGS
Published
September 22, 2026
MINOR

Stronger than 39% of the 1,782 earthquake reports in Areazine's archive, weaker than 1,041 others.

Record status: USGS's reading at the moment of detection — the agency keeps revising magnitude, aftershock counts, and felt reports on its own event page as more data arrives.

What Happened

A M 3.7 ml earthquake struck 37 km SW of Karluk, Alaska, on 2026-09-20 at 12:48:00 UTC. The event had a depth of 49.7 km.

Location Details

The earthquake was located at latitude 57.297, longitude -154.831. This places it 37 km southwest of Karluk, Alaska. The depth of 49.7 km classifies it as an intermediate-depth event (20-70 km).

Impact Assessment

No felt reports were recorded. The maximum estimated intensity (MMI) was 2.983. There was no tsunami advisory (tsunami flag: 0) and no alert level issued.

What You Should Know

This was a minor earthquake (M 2.5-3.9), which is often felt but rarely causes damage. Minor aftershocks are possible following any earthquake.

Source

Data from USGS: https://earthquake.usgs.gov/earthquakes/eventpage/aka2026suhjvu

Original source: USGS Official Notice ↗

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Comparable nationwide notices (length or severity timing) 8

Two cross-category peer sets, both computed from Areazine's own archive: notices with a similar body length, and notices near the same severity and agency date. These are drawn from other categories, not the same-feed Related list above.

Similar body length

Nearest notices by article body length (791 characters here).

Red Tornado Warning Issued for Eastern Ontario (Jun 18, 2026) 791 chars Tornado Watch in Effect for Lake St. Clair 791 chars Yellow Heat Warning Issued for Eastern Lambton County (Sep 3, 2026) 791 chars Yellow Tornado Watch Issued for R.M. of Francis 791 chars

Similar severity timing

Same severity (low) notices issued closest in time to September 22, 2026.

Yellow Frost Advisory for Fredericton and Southern York County low Fire Alarm, Hughes St, Barooga low M 2.7 ml Earthquake Reported in England on September 21, 2026 low Yellow Frost Advisory for Red Lake - Woodland Caribou Park (Sep 21, 2026) low

What People Ask

What people usually ask about a notice like this one.

What was the magnitude of this event? ▾
A magnitude 3.7 earthquake occurred 37 km southwest of Karluk, Alaska, at a depth of 49.7 km.
What does a magnitude 3.7 ("Minor") earthquake mean? ▾
The USGS classifies M3.7 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 #1,042 strongest of the 1,782 earthquake reports in Areazine's archive by magnitude, stronger than 39% of them and weaker than 1,041 others.
Was Karluk likely to feel this earthquake? ▾
This event was centered 37 km SW of Karluk. 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.

Primary source data

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