M2.4 Earthquake 60 km W of Happy Valley, Alaska — September 18, 2025
2025-09-18 21:32:43 UTC (2025-09-18) · approx. 11:32 AM UTC-10 local
On September 18, 2025 at 21:32 UTC, a magnitude 2.4 intermediate depth earthquake struck 60 km W of Happy Valley, Alaska, at a depth of 108.7 km and coordinates 60.0244°, -152.8053°.
Physical scale: An earthquake of magnitude 2.4 releases seismic energy equivalent to roughly 60.0 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 27 m — a useful intuition for the size of the slip patch on the fault.
Did You Feel It? — community-reported shaking
Aggregated felt-report intensity from 1 citizen response to the USGS Did You Feel It? system. Each colored zone represents the average MMI from reports in that area.
Source: U.S. Geological Survey Did You Feel It?. View on USGS · submit your own report
Earthquake Details
-152.8053°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 2.4 earthquake near Happy Valley, Alaska?
The magnitude 2.4 earthquake that struck 60 km W of Happy Valley, Alaska on September 18, 2025 at 21:32 UTC had a depth of 108.7 km. For context, this was a minor earthquake typically detected only by instruments.
Were there aftershocks?
Aftershock activity is monitored continuously by the USGS. Aftershock sequences from magnitude 2.4 earthquakes can continue for several days and gradually diminish over time.
What should I do after an earthquake?
If you were in the affected area: check yourself and others for injuries, inspect your home for damage, and be prepared for aftershocks. For detailed guidance, see our earthquake safety guide and emergency planning resources.
Actions
Understanding This Data
Magnitude 2.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: ak025bzzymse). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, September 18, 2025). M2.4 Earthquake 60 km W of Happy Valley, Alaska — September 18, 2025. Retrieved May 28, 2026 from https://www.earthquaketracker.org/earthquakes/event/ak025bzzymse/