4.2
Earthquake Details: 100 km S of False Pass, Alaska
Aug 21, 2026, 03:14:24
A magnitude 4.2 earthquake occurred near 100 km S of False Pass, Alaska on Aug 21, 2026 at 03:14:24. The seismic event was recorded at a depth of 30.86 km. No tsunami warning was issued.
No Tsunami WarningStatus: ReviewedType: Earthquake
Regional Seismicity
Technical Details
Depth30.86 km
Significance271
Latitude53.9496
Longitude-163.3413
Event IDus6000tmd6
Magnitude4.2
Updated:Aug 21, 2026, 05:10:34 UTC
External Resources
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Time & depth
- Local time
- Aug 20, 2026, 19:14:24 AKDT
- UTC
- Aug 21, 2026, 03:14:24 UTC
30.86 km · Shallow-focus
Less than 70 km deep. Shaking is often stronger near the epicentre.
Nearby major cities
Nearby event sequence · 12
M3.293 km SE of King Cove, AlaskaBeforeM3.389 km SE of King Cove, AlaskaBeforeM3.487 km SSW of Unalaska, AlaskaBeforeM3.491 km SSW of Unalaska, AlaskaBeforeM3.687 km SSE of Sand Point, AlaskaBeforeM3.589 km S of Sand Point, AlaskaBeforeM3.77 km SW of Sand Point, AlaskaBeforeM4.373 km SSE of Akutan, AlaskaBeforeM3.172 km SSW of Ugashik, AlaskaBeforeM3.1Alaska PeninsulaBeforeM3.2196 km SE of Perryville, AlaskaAfterM3.5104 km SSE of Sand Point, AlaskaAfter
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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 21, 2026, 05:10 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.