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United States · Alaska

M3.1 Earthquake near Unorganized Borough, Alaska (United States)

UTC time: 2026-08-20 16:14:41 UTC Local time: —

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About this earthquake

On August 20, 2026 at 16:14 UTC, a magnitude M3.1 earthquake occurred near Unorganized Borough, Alaska (United States). With a focal depth of about 2 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Earthquakes of this magnitude are often felt but rarely cause damage.

The event was recorded by USGS. United States: over the past 24 hours, QuakeMap24 logged 186 earthquakes, the strongest at M4.1.

Depth profile

Depth profile Depth: 1.8 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 1.8 km
Shallow
1.8 km
1.8 km — shallower than the regional average (15.2 km)
Regional average: 15.2 km
Why depth matters

Shallow quakes release energy near the surface — shaking is felt more strongly and damage potential is higher.

Depth classes per USGS

Volcanoes nearby

  • Alligator Lake
    Distance: 167 km ·Volcanic field ·Elevation: 2'217 m ·Canada
  • Atlin Volcanic Field
    Distance: 187 km ·Pyroclastic cone(s) ·Elevation: 1'880 m ·Canada
  • Edgecumbe
    Distance: 219 km ·Volcanic field ·Elevation: 970 m ·Last eruption: -2080 ·United States
  • Heart Peaks
    Distance: 256 km ·Shield ·Elevation: 2'012 m ·Canada
  • Level Mountain
    Distance: 296 km ·Shield ·Elevation: 2'164 m ·Canada
  • Tuya Volcanic Field
    Distance: 331 km ·Volcanic field ·Elevation: 2'123 m ·Canada

Alaska

Context for this earthquake

05 Oct 2025 – 05 Oct 2026 · M ≥ 3.0 · 653 Catalogue entries

Sufficiently reliable matching data are not currently available for a direct comparison. The area profile shows the available records and their limitations.

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Historic earthquake map · United States

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Country statistics · United States

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