3.1

Earthquake Details: 177 km W of Nikolski, Alaska

Oct 20, 2026, 23:35:39

Depth
11.4 km
Felt reports
No data
Source: USGSUpdated: Oct 21, 2026, 11:04 PM UTC

A magnitude 3.1 earthquake occurred on Oct 20, 2026 at 23:35:39. Epicenter: 177 km W of Nikolski, Alaska. Reported depth: 11.4 km.

Tsunami information

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Time & depth

Local time
Oct 20, 2026, 12:35:39 GMT-11
UTC
Oct 20, 2026, 23:35:39 UTC
11.4 km · Shallow-focus

Less than 70 km deep. Shaking is often stronger near the epicentre.

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Nearby earthquakes · 12
M2.571 km SE of Adak, AlaskaBeforeM3.072 km SE of Akutan, AlaskaBeforeM3.886 km SSW of Unalaska, AlaskaBeforeM2.5128 km W of Adak, AlaskaBeforeM2.5124 km SE of Unalaska, AlaskaBeforeM3.053 km SW of Adak, AlaskaBeforeM4.0161 km S of Nikolski, AlaskaBeforeM3.7123 km SSW of Nikolski, AlaskaBeforeM3.687 km SE of Unalaska, AlaskaBeforeM3.263 km SW of Adak, AlaskaBeforeM3.168 km E of Atka, AlaskaBeforeM2.9186 km S of Atka, AlaskaBefore

Agency measurements

Agencies may use different observations and magnitude scales, and initial estimates can change.

  • USGSM 3.1

    us6000u3uu

    Depth:
    11.4 km
    Time:
    Updated:
    Oct 21, 2026, 11:04 PM UTC

Technical Details

Depth11.4 km
Significance148
Latitude53.1482
Longitude-171.4921
Event IDus6000u3uu
Magnitude3.1
Updated:Oct 21, 2026, 23:04:48 UTC

Regional Seismicity

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External Resources

View on USGS Official Site

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 21, 2026, 23:04 UTC.

Data sources: