3.4
Earthquake Details: 231 km ESE of Attu Station, Alaska
Aug 21, 2026, 07:21:30
A magnitude 3.4 earthquake occurred near 231 km ESE of Attu Station, Alaska on Aug 21, 2026 at 07:21:30. The seismic event was recorded at a depth of 10 km. No tsunami warning was issued.
No Tsunami WarningStatus: ReviewedType: Earthquake
Regional Seismicity
View recent seismic activity near this event:
Technical Details
Depth10 km
Significance178
Latitude52.0444
Longitude176.3281
Event IDus6000tmlc
Magnitude3.4
Updated:Aug 29, 2026, 08:57:16 UTC
External Resources
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Time & depth
- Local time
- Aug 21, 2026, 07:21:30
- UTC
- Aug 21, 2026, 07:21:30 UTC
10 km · Shallow-focus
Less than 70 km deep. Shaking is often stronger near the epicentre.
Earthquake information is automatically aggregated from the official seismic agencies listed below. Preliminary measurements can change as agencies review an event; use local emergency authorities for safety decisions. Latest successful data update: Aug 29, 2026, 08:57 UTC.
Data sources:
- USGS — Credit: U.S. Geological Survey.
- EMSC — Credit: EMSC/CSEM. Event catalogue data are provided under CC BY 4.0. CC BY 4.0
- JMA — Source: Japan Meteorological Agency (JMA).
- Geoscience Australia — Based on Australian Earthquakes data by Geoscience Australia. © Commonwealth of Australia. Licensed under CC BY 4.0; the section 5 disclaimer applies. CC BY 4.0
- GeoNet — We acknowledge the New Zealand GeoNet programme and its sponsors NHC, Earth Sciences NZ, LINZ, NEMA and MBIE for providing earthquake data.