Earthquakes medium

M 4.0 - 63 km S of Cantwell, Alaska

Source: USGS · Alaska

A magnitude 4.0 earthquake was recorded by USGS near 63 km S of Cantwell. On the USGS Earthquake Hazards Program scale, M4.0 is classified "Light". Among the 1,706 earthquake reports Areazine has published, this M4.0 event ranks stronger than 46% of them (rank #897 by magnitude).

Read this earthquake report in 30 seconds

Magnitude
M 4.0
USGS class
Light
Location
63 km S of Cantwell
Archive rank
#897 of 1,706
Source
USGS
Published
September 12, 2026
LIGHT

Stronger than 46% of the 1,706 earthquake reports in Areazine's archive, weaker than 896 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 4.0 ml earthquake occurred 63 km S of Cantwell, Alaska, on 2026-09-12 at 03:58:26 UTC. The event had a depth of 69.8 km and was recorded by 59 stations.

Location Details

The epicenter was located at latitude 62.826, longitude -149.032. This places the event 63 km south of Cantwell, Alaska. The depth of 69.8 km is classified as intermediate (20-70 km).

Impact Assessment

No felt reports were recorded. There was no tsunami advisory (tsunami: 0) and no alert level was issued.

What You Should Know

Earthquakes of this magnitude are often felt but rarely cause damage. Aftershocks are possible following any seismic event.

Source

https://earthquake.usgs.gov/earthquakes/eventpage/aka2026sbqvff - USGS

Original source: USGS Official Notice ↗

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Nationwide notices with similar length or severity timing 8

Two Areazine-derived peer sets for this USGS earthquake report: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.

Similar body length

Nearest notices by article body length (736 characters here).

Bushfire Advice Alert for North Barham Rd, Barham 736 chars Yellow Fog Advisory for Merrickville-Wolford - Kemptville 736 chars Yellow Snowfall Warning in Effect for Summer Beaver and Surrounding Areas 736 chars Yellow Watch - Severe Thunderstorm in Effect for Deep River - Whitney - Eastern Algonquin Park 736 chars

Similar severity timing

Same severity (medium) notices issued closest in time to September 12, 2026.

Planned Burn Alert for Glen William Rd, Clarence Town medium Grass Fire Advice for North St, West Kempsey medium Car Fire Alert at Cooka Hills Rd, Cookamidgera medium Planned Event at Yeoval Golf Club Warne St, Yeoval medium

Frequently Asked Questions

Common questions about this USGS earthquake report.

What magnitude was this earthquake? ▾
A magnitude 4.0 ml earthquake struck 63 km south of Cantwell, Alaska, at a depth of 69.8 km.
What does a magnitude 4.0 ("Light") earthquake mean? ▾
The USGS classifies M4.0 as "Light" 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 #897 strongest of the 1,706 earthquake reports in Areazine's archive by magnitude, stronger than 46% of them and weaker than 896 others.
Was Cantwell likely to feel this earthquake? ▾
This event was centered 63 km S of Cantwell. 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

EPA Outdoor Air Quality Data

Federal monitoring network, every measurement we report

AirNow (EPA / NOAA)

Real-time AQI for every monitored U.S. location

National Weather Service

Active watches, warnings, and advisories, NOAA

CDC Air Quality & Health

Health-impact reference behind every AQI category