M 4.2 Earthquake 157 km WSW of Adak, Alaska
A magnitude 4.2 earthquake was recorded by USGS near 157 km WSW of Adak. On the USGS Earthquake Hazards Program scale, M4.2 is classified "Light". Among the 1,712 earthquake reports Areazine has published, this M4.2 event ranks stronger than 49% of them (rank #849 by magnitude).
Read this earthquake report in 30 seconds
- Magnitude
- M 4.2
- USGS class
- Light
- Location
- 157 km WSW of Adak
- Archive rank
- #849 of 1,712
- Source
- USGS
- Published
- September 13, 2026
Stronger than 49% of the 1,712 earthquake reports in Areazine's archive, weaker than 848 others.
Record status: a snapshot from USGS, not a final record. Check USGS's own event page for aftershocks and any later revision to the magnitude shown here.
What Happened
A M 4.2 ml earthquake occurred at 2026-09-12 12:48:41 UTC (reviewed by USGS) with an epicenter at 51.118°N, 178.556°W. The event was located 157 km WSW of Adak, Alaska, at a depth of 18.6 km, which classifies as shallow (less than 20 km).
Location Details
The earthquake was centered 157 km west-southwest of Adak, Alaska, at coordinates 51.118 latitude, -178.556 longitude. The shallow depth of 18.6 km means the event occurred in the upper crust.
Impact Assessment
No felt reports were recorded. The maximum modified Mercalli intensity was estimated at 3.485. There was no tsunami advisory (tsunami flag: 0) and no alert level issued.
What You Should Know
Earthquakes of this magnitude are classified as light and are often felt but rarely cause damage. Residents in the region should be aware of the possibility of aftershocks and follow standard earthquake safety practices such as drop, cover, and hold on during shaking.
Source
https://earthquake.usgs.gov/earthquakes/eventpage/aka2026sddwmu (USGS)
Original source: USGS Official Notice ↗
Related Earthquakes
All Earthquakes →Elsewhere in the country: 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 (1,037 characters here).
Similar severity timing
Same severity (medium) notices issued closest in time to September 13, 2026.
What People Ask
Questions readers often have about this USGS earthquake report.