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M4.0 Depth: 101.2 km

M4.0 Earthquake near 59 km W of Happy Valley, Alaska (United States)

UTC time: 2025-12-31 20:36:22 UTC Local time: —

About this earthquake

On December 31, 2025 at 20:36 UTC, a magnitude M4.0 earthquake occurred near 59 km W of Happy Valley, Alaska (United States). At around 101 km, the focal depth places this among intermediate-depth events. Earthquakes of this magnitude are clearly felt; minor damage to vulnerable buildings is possible.

The data is provided by USGS and cross-checked across seismological networks. United States: over the past 24 hours, QuakeMap24 logged 197 earthquakes, the strongest at M4.3.

Details

Magnitude
M4.0
Depth
101.2 km
UTC time
2025-12-31 20:36:22 UTC
Local time
—
Country
United States
City
Alaska
Source
usgs
Coordinates
60.04800, -152.77100
Temperature
-15.5°C

Map

Depth profile

Depth profile Depth: 101.2 km (Intermediate) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 101.2 km
Intermediate
101.2 km
101.2 km — deeper than the regional average (15.7 km)
Regional average: 15.7 km
Why depth matters

Intermediate-depth quakes are felt across a wider area but usually cause less surface damage.

Depth classes per USGS

Volcanoes nearby

  • Iliamna
    Distance: 18 km ·Stratovolcano ·Elevation: 3'053 m ·Last eruption: 1876 ·United States
  • Redoubt
    Distance: 49 km ·Stratovolcano ·Elevation: 3'108 m ·Last eruption: 2009 ·United States
  • Augustine
    Distance: 85 km ·Lava dome(s) ·Elevation: 1'218 m ·Last eruption: 2006 ·United States
  • Douglas
    Distance: 140 km ·Stratovolcano ·Elevation: 2'140 m ·United States
  • Spurr
    Distance: 142 km ·Stratovolcano ·Elevation: 3'374 m ·Last eruption: 1992 ·United States
  • Fourpeaked
    Distance: 151 km ·Stratovolcano ·Elevation: 2'105 m ·Last eruption: 2006 ·United States

Historic earthquake map · United States

Open history map
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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