M3.4 Earthquake 228 km ESE of Attu Station, Alaska — July 16, 2026
2026-07-16 00:47:25 UTC (52 min ago) · approx. 12:47 PM UTC+12 local
On July 16, 2026 at 00:47 UTC, a magnitude 3.4 shallow crustal earthquake struck 228 km ESE of Attu Station, Alaska, at a depth of 10.0 km and coordinates 52.0380°, 176.2750°.
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.
ShakeMap — predicted shaking intensity
Modeled ground-motion intensity contoured on the Modified Mercalli scale (MMI). Computed by the USGS from the moment-tensor solution and regional ground-motion prediction equations.
Source: U.S. Geological Survey ShakeMap. View interactive ShakeMap on USGS
Earthquake Details
176.2750°E
Technical Information
Nearby Earthquakes (Last 7 Days)
Common Questions
How strong was the magnitude 3.4 earthquake near Attu Station, Alaska?
The magnitude 3.4 earthquake that struck 228 km ESE of Attu Station, Alaska on July 16, 2026 at 00:47 UTC had a depth of 10.0 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.
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Understanding This Data
Magnitude 3.4 earthquakes are typically only recorded by instruments.
Authoritative source: USGS event page (event ID: us7000t0uu). All scientific values on this page are sourced verbatim from the USGS feed.
Cite this page: EarthquakeTracker.org. (2026, July 16, 2026). M3.4 Earthquake 228 km ESE of Attu Station, Alaska — July 16, 2026. Retrieved July 16, 2026 from https://www.earthquaketracker.org/earthquakes/event/us7000t0uu/