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M3.6 Depth: 28.9 km

M3.6 Earthquake near 23 km NW of Old Harbor, Alaska (United States)

UTC time: 2025-10-29 19:12:09 UTC Local time: —

About this earthquake

On October 29, 2025 at 19:12 UTC, a magnitude M3.6 earthquake occurred near 23 km NW of Old Harbor, Alaska (United States). The hypocenter lay relatively close to the surface at around 29 km, increasing how strongly it was felt. Shaking of this size is frequently noticed but usually harmless.

The data is provided by USGS and cross-checked across seismological networks. United States: 172 earthquakes were recorded in the past 24 hours, the strongest reaching M5.5.

Details

Magnitude
M3.6
Depth
28.9 km
UTC time
2025-10-29 19:12:09 UTC
Local time
—
Country
United States
City
Alaska
Source
usgs
Coordinates
57.32540, -153.62820
Temperature
1.4°C

Map

Depth profile

Depth profile Depth: 28.9 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 28.9 km
Shallow
28.9 km
28.9 km — deeper than the regional average (15.5 km)
Regional average: 15.5 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

  • Alaska Peninsula Arc at 155.4°W
    Distance: 122 km ·Lava dome ·Elevation: 402 m ·United States
  • Snowy Mountain
    Distance: 129 km ·Stratovolcano(es) ·Elevation: 2'162 m ·Last eruption: 1710 ·United States
  • Steller
    Distance: 131 km ·Stratovolcano ·Elevation: 2'279 m ·United States
  • Denison
    Distance: 131 km ·Stratovolcano ·Elevation: 2'287 m ·United States
  • Katmai
    Distance: 132 km ·Stratovolcano ·Elevation: 2'047 m ·Last eruption: 1912 ·United States
  • Kukak
    Distance: 133 km ·Stratovolcano ·Elevation: 2'043 m ·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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