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M4.0 Depth: 36.5 km

M4.0 Earthquake near RAT ISLANDS, ALEUTIAN ISLANDS (United States)

UTC time: 2025-08-22 00:18:32 UTC Local time: —

About this earthquake

On August 22, 2025 at 00:18 UTC, a magnitude M4.0 earthquake occurred near RAT ISLANDS, ALEUTIAN ISLANDS (United States). With a focal depth of about 37 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Tremors of this size are distinctly felt and can occasionally cause light damage.

The data is provided by EMSC and cross-checked across seismological networks. United States: over the past 24 hours, QuakeMap24 logged 154 earthquakes, the strongest at M3.6.

Details

Magnitude
M4.0
Depth
36.5 km
UTC time
2025-08-22 00:18:32 UTC
Local time
—
Country
United States
City
Alaska
Source
emsc
Coordinates
51.17520, 179.21060
Temperature
13.3°C

Map

Depth profile

Depth profile Depth: 36.5 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 36.5 km
Shallow
36.5 km
36.5 km — deeper than the regional average (15.9 km)
Regional average: 15.9 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

  • Semisopochnoi
    Distance: 88 km ·Stratovolcano ·Elevation: 1'221 m ·Last eruption: 2023 ·United States
  • Little Sitkin
    Distance: 98 km ·Stratovolcano ·Elevation: 1'174 m ·Last eruption: 1830 ·United States
  • Davidof
    Distance: 107 km ·Stratovolcano ·Elevation: 328 m ·United States
  • Segula
    Distance: 119 km ·Stratovolcano ·Elevation: 1'160 m ·United States
  • Kiska
    Distance: 152 km ·Stratovolcano ·Elevation: 1'220 m ·Last eruption: 1990 ·United States
  • Buldir
    Distance: 262 km ·Stratovolcano ·Elevation: 656 m ·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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