M3.0 Earthquake 49 km W of Happy Valley, Alaska — July 21, 2026
2026-07-21 18:32:41 UTC (1 hour ago) · approx. 8:32 AM UTC-10 local
On July 21, 2026 at 18:32 UTC, a magnitude 3.0 intermediate depth earthquake struck 49 km W of Happy Valley, Alaska, at a depth of 105.5 km and coordinates 59.9840°, -152.6170°.
Physical scale: An earthquake of magnitude 3.0 releases seismic energy equivalent to roughly 477 kg of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 71 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-152.6170°E
Technical Information
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Common Questions
How strong was the magnitude 3.0 earthquake near Happy Valley, Alaska?
The magnitude 3.0 earthquake that struck 49 km W of Happy Valley, Alaska on July 21, 2026 at 18:32 UTC had a depth of 105.5 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 3.0 earthquakes can continue for several days and gradually diminish over time.
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Understanding This Data
Magnitude 3.0 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: aka2026oirmza). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 21, 2026). M3.0 Earthquake 49 km W of Happy Valley, Alaska — July 21, 2026. Retrieved July 21, 2026 from https://www.earthquaketracker.org/earthquakes/event/aka2026oirmza/