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M3.1 Depth: 32.6 km

M3.1 Earthquake near 28 km N of Old Harbor, Alaska (United States)

UTC time: 2025-08-31 16:05:16 UTC Local time: —

About this earthquake

A magnitude M3.1 earthquake was recorded near 28 km N of Old Harbor, Alaska (United States) on August 31, 2025 at 16:05 UTC. With a focal depth of about 33 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 237 earthquakes, the strongest at M3.9.

Details

Magnitude
M3.1
Depth
32.6 km
UTC time
2025-08-31 16:05:16 UTC
Local time
—
Country
United States
City
Alaska
Source
usgs
Coordinates
57.45900, -153.31070
Temperature
10.7°C

Map

Depth profile

Depth profile Depth: 32.6 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 32.6 km
Shallow
32.6 km
32.6 km — deeper than the regional average (15.4 km)
Regional average: 15.4 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

  • Steller
    Distance: 125 km ·Stratovolcano ·Elevation: 2'279 m ·United States
  • Denison
    Distance: 126 km ·Stratovolcano ·Elevation: 2'287 m ·United States
  • Kukak
    Distance: 127 km ·Stratovolcano ·Elevation: 2'043 m ·United States
  • Snowy Mountain
    Distance: 127 km ·Stratovolcano(es) ·Elevation: 2'162 m ·Last eruption: 1710 ·United States
  • Alaska Peninsula Arc at 155.4°W
    Distance: 133 km ·Lava dome ·Elevation: 402 m ·United States
  • Katmai
    Distance: 133 km ·Stratovolcano ·Elevation: 2'047 m ·Last eruption: 1912 ·United States

Historic earthquake map · United States

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Explore recent and long-term earthquake activity in this country. Use filters to narrow down by magnitude, depth, and date range.

Country statistics · United States

Country overview
View earthquake KPIs, strongest and latest events, and averages for this country.

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