3.9
Earthquake Details: 107 km SSE of Adak, Alaska
Oct 17, 2026, 03:33:59
- Depth
- 10.97 km
- Felt reports
- No data
Source: USGSUpdated: Oct 17, 2026, 04:19 AM UTC
A magnitude 3.9 earthquake occurred on Oct 17, 2026 at 03:33:59. Epicenter: 107 km SSE of Adak, Alaska. Reported depth: 10.97 km.
Tsunami information
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Time & depth
- Local time
- Oct 16, 2026, 15:33:59 GMT-12
- UTC
- Oct 17, 2026, 03:33:59 UTC
10.97 km · Shallow-focus
Less than 70 km deep. Shaking is often stronger near the epicentre.
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Nearby earthquakes · 9
M3.9294 km ESE of Attu Station, AlaskaBeforeM3.58 km SW of Atka, AlaskaBeforeM2.6294 km W of Adak, AlaskaBeforeM2.6155 km W of Adak, AlaskaBeforeM4.7114 km SSW of Nikolski, AlaskaBeforeM2.5Rat Islands, Aleutian Islands, AlaskaBeforeM2.272 km WSW of Nikolski, AlaskaBeforeM3.4201 km SSE of Atka, AlaskaAfterM4.0Rat Islands, Aleutian Islands, AlaskaAfter
Agency measurements
Agencies may use different observations and magnitude scales, and initial estimates can change.
- USGSM 3.9
us6000u2xm
- Depth:
- 10.97 km
- Time:
- Updated:
- Oct 17, 2026, 04:19 AM UTC
Technical Details
Depth10.97 km
Significance234
Latitude50.9517
Longitude-176.1727
Event IDus6000u2xm
Magnitude3.9
Updated:Oct 17, 2026, 04:19:06 UTC
Regional Seismicity
View recent seismic activity near this event:
External Resources
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: Oct 17, 2026, 04:19 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.