M3.4 Earthquake 51 km SSW of Unalaska, Alaska — June 28, 2025
2025-06-28 18:54:01 UTC (2025-06-28) · approx. 7:54 AM UTC-11 local
On June 28, 2025 at 18:54 UTC, a magnitude 3.4 intermediate depth earthquake struck 51 km SSW of Unalaska, Alaska, at a depth of 79.6 km and coordinates 53.4402°, -166.8007°.
Physical scale: An earthquake of magnitude 3.4 releases seismic energy equivalent to roughly 1.9 metric tons of TNT. Empirical fault-scaling laws (Wells & Coppersmith, 1994) estimate the subsurface rupture length at approximately 134 m — a useful intuition for the size of the slip patch on the fault.
Earthquake Details
-166.8007°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.4 earthquake near Unalaska, Alaska?
The magnitude 3.4 earthquake that struck 51 km SSW of Unalaska, Alaska on June 28, 2025 at 18:54 UTC had a depth of 79.6 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 3.4 earthquakes can continue for several days and gradually diminish over time.
Actions
Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000qchv). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2025, June 28, 2025). M3.4 Earthquake 51 km SSW of Unalaska, Alaska — June 28, 2025. Retrieved September 4, 2025 from https://www.earthquaketracker.org/earthquakes/event/us7000qchv/