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M5.9 Depth: 133.7 km

M5.9 Earthquake near 241 km W of Adak, Alaska (United States)

UTC time: 2025-08-28 11:07:48 UTC Local time: —

About this earthquake

A magnitude M5.9 earthquake was recorded near 241 km W of Adak, Alaska (United States) on August 28, 2025 at 11:07 UTC. At around 134 km, the focal depth places this among intermediate-depth events. Earthquakes of this magnitude can damage poorly built structures.

The event was recorded by USGS. United States: over the past 24 hours, QuakeMap24 logged 165 earthquakes, the strongest at M3.6.

Details

Magnitude
M5.9
Depth
133.7 km
UTC time
2025-08-28 11:07:48 UTC
Local time
—
Country
United States
City
Alaska
Source
usgs
Coordinates
52.00020, 179.86050
Temperature
8.6°C

Map

Depth profile

Depth profile Depth: 133.7 km (Intermediate) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 133.7 km
Intermediate
133.7 km
133.7 km — deeper than the regional average (15.9 km)
Regional average: 15.9 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: 21 km ·Stratovolcano ·Elevation: 1'221 m ·Last eruption: 2023 ·United States
  • Little Sitkin
    Distance: 90 km ·Stratovolcano ·Elevation: 1'174 m ·Last eruption: 1830 ·United States
  • Davidof
    Distance: 105 km ·Stratovolcano ·Elevation: 328 m ·United States
  • Segula
    Distance: 118 km ·Stratovolcano ·Elevation: 1'160 m ·United States
  • Kiska
    Distance: 155 km ·Stratovolcano ·Elevation: 1'220 m ·Last eruption: 1990 ·United States
  • Buldir
    Distance: 272 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 hours9
First 72 hours9
Strongest subsequent eventM5.9
M5.52025-08-28 11:07:49 UTC10.8 kmAlaska M5.72025-08-28 11:07:50 UTC15.0 kmEvent of magnitude 5.7, near of Anchorage (Monde) M5.92025-08-28 11:07:50 UTC11.6 kmRat Islands, Aleutian Islands, United States [Sea: United States] M5.22025-08-29 09:14:16 UTC55.2 kmAlaska M5.42025-08-29 09:14:17 UTC25.1 kmRat Islands, Aleutian Islands M5.52025-08-29 09:14:24 UTC46.9 km263 km W of Adak, Alaska M5.52025-08-29 09:14:25 UTC45.9 km264 km W of Adak, Alaska M5.52025-08-29 09:14:25 UTC39.3 km M5.02025-08-29 09:14:26 UTC55.0 kmAlaska M5.02025-09-13 01:58:48 UTC36.8 kmRat Islands, Aleutian Islands M4.52025-09-13 01:58:55 UTC61.7 kmAlaska M4.52025-09-13 01:58:56 UTC56.7 km

Historical context nearby

Comparison with recorded earthquakes before this event within 150 km.

Magnitude rank#2
Earlier events M≥424
Earlier events M≥512
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 UTC21.3 kmRat Islands, Aleutian Islands M5.82025-08-28 11:07:47 UTC10.9 kmAlaska M5.42025-07-26 05:03:54 UTC100.6 km M5.42025-07-26 05:03:53 UTC105.5 kmRat Islands, Aleutian Islands, Alaska M5.32025-07-26 23:09:39 UTC109.2 kmRat Islands, Aleutian Islands, Alaska

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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