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M5.5 Depth: 77.8 km

M5.5 Earthquake near 263 km W of Adak, Alaska

UTC time: 2025-08-29 09:14:24 UTC Local time: —

About this earthquake

A magnitude M5.5 earthquake was recorded near 263 km W of Adak, Alaska on August 29, 2025 at 09:14 UTC. The earthquake originated at an intermediate depth of about 78 km. Earthquakes of this magnitude can damage poorly built structures.

The event was recorded by USGS.

Details

Magnitude
M5.5
Depth
77.8 km
UTC time
2025-08-29 09:14:24 UTC
Local time
—
Country
—
Source
usgs
Coordinates
51.61640, 179.57930
Temperature
11.4°C

Map

Depth profile

Depth profile Depth: 77.8 km (Intermediate) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 77.8 km
Intermediate
77.8 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

  • Semisopochnoi
    Distance: 35 km ·Stratovolcano ·Elevation: 1'221 m ·Last eruption: 2023 ·United States
  • Little Sitkin
    Distance: 80 km ·Stratovolcano ·Elevation: 1'174 m ·Last eruption: 1830 ·United States
  • Davidof
    Distance: 94 km ·Stratovolcano ·Elevation: 328 m ·United States
  • Segula
    Distance: 109 km ·Stratovolcano ·Elevation: 1'160 m ·United States
  • Kiska
    Distance: 146 km ·Stratovolcano ·Elevation: 1'220 m ·Last eruption: 1990 ·United States
  • Buldir
    Distance: 264 km ·Stratovolcano ·Elevation: 656 m ·United States

Subsequent earthquakes nearby

Events recorded after this earthquake within 150 km. They are not automatically classified as aftershocks.

First 6 hours3
First 24 hours3
First 72 hours3
Strongest subsequent eventM5.5
M5.52025-08-29 09:14:25 UTC2.3 km264 km W of Adak, Alaska M5.52025-08-29 09:14:25 UTC8.6 km M5.02025-08-29 09:14:26 UTC8.7 kmAlaska M5.02025-09-13 01:58:48 UTC14.2 kmRat Islands, Aleutian Islands M4.52025-09-13 01:58:55 UTC17.1 kmAlaska M4.52025-09-13 01:58:56 UTC13.1 km M4.52025-09-16 19:10:30 UTC97.2 kmRat Islands, Aleutian Islands, Alaska M3.22025-09-17 01:13:38 UTC39.0 km230 km WSW of Adak, Alaska M3.02025-09-17 01:13:38 UTC37.0 km M0.72025-09-19 22:17:08 UTC36.1 km261 km W of Adak, Alaska

Historical context nearby

Comparison with recorded earthquakes before this event within 150 km.

Magnitude rank#8
Earlier events M≥433
Earlier events M≥521
Compared since2025-01-30

The QuakeMap24 comparison dataset begins on 2024-03-23. Earlier earthquakes may not be included.

Strongest earlier events

M6.12025-08-28 11:07:35 UTC65.9 kmRat Islands, Aleutian Islands M5.92025-08-28 11:07:50 UTC57.8 kmRat Islands, Aleutian Islands, United States [Sea: United States] M5.92025-08-28 11:07:48 UTC46.9 km241 km W of Adak, Alaska M5.92025-08-28 11:07:48 UTC70.6 km M5.92025-08-28 11:07:48 UTC60.1 kmRat Islands

Stats (last 24h)

Global (24h)
671
Country (24h)
—
—
Current earthquakes in
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No recent events available.

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