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M5.5 Depth: 121.0 km

M5.5 Earthquake near Alaska (United States)

UTC time: 2025-08-28 11:07:49 UTC Local time: —

About this earthquake

On August 28, 2025 at 11:07 UTC, a magnitude M5.5 earthquake occurred near Alaska (United States). At around 121 km, the focal depth places this among intermediate-depth events. Earthquakes of this magnitude can damage poorly built structures.

The data is provided by USGS and cross-checked across seismological networks. United States: over the past 24 hours, QuakeMap24 logged 163 earthquakes, the strongest at M3.6.

Details

Magnitude
M5.5
Depth
121.0 km
UTC time
2025-08-28 11:07:49 UTC
Local time
—
Country
United States
City
Alaska
Source
usgs
Coordinates
51.91800, 179.94400
Temperature
8.6°C

Map

Depth profile

Depth profile Depth: 121 km (Intermediate) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 121 km
Intermediate
121 km
121 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: 25 km ·Stratovolcano ·Elevation: 1'221 m ·Last eruption: 2023 ·United States
  • Little Sitkin
    Distance: 96 km ·Stratovolcano ·Elevation: 1'174 m ·Last eruption: 1830 ·United States
  • Davidof
    Distance: 111 km ·Stratovolcano ·Elevation: 328 m ·United States
  • Segula
    Distance: 124 km ·Stratovolcano ·Elevation: 1'160 m ·United States
  • Kiska
    Distance: 162 km ·Stratovolcano ·Elevation: 1'220 m ·Last eruption: 1990 ·United States
  • Buldir
    Distance: 279 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 hours2
First 24 hours8
First 72 hours8
Strongest subsequent eventM5.9
M5.72025-08-28 11:07:50 UTC24.4 kmEvent of magnitude 5.7, near of Anchorage (Monde) M5.92025-08-28 11:07:50 UTC17.5 kmRat Islands, Aleutian Islands, United States [Sea: United States] M5.22025-08-29 09:14:16 UTC49.1 kmAlaska M5.42025-08-29 09:14:17 UTC27.4 kmRat Islands, Aleutian Islands M5.52025-08-29 09:14:24 UTC41.9 km263 km W of Adak, Alaska M5.52025-08-29 09:14:25 UTC41.4 km264 km W of Adak, Alaska M5.52025-08-29 09:14:25 UTC35.5 km M5.02025-08-29 09:14:26 UTC49.3 kmAlaska M5.02025-09-13 01:58:48 UTC34.7 kmRat Islands, Aleutian Islands M4.52025-09-13 01:58:55 UTC55.0 kmAlaska M4.52025-09-13 01:58:56 UTC50.0 km M4.52025-09-16 19:10:30 UTC125.0 kmRat Islands, Aleutian Islands, Alaska

Historical context nearby

Comparison with recorded earthquakes before this event within 150 km.

Magnitude rank#6
Earlier events M≥428
Earlier events M≥516
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 UTC31.4 kmRat Islands, Aleutian Islands M5.92025-08-28 11:07:48 UTC10.8 km241 km W of Adak, Alaska M5.92025-08-28 11:07:48 UTC33.7 km M5.92025-08-28 11:07:48 UTC24.4 kmRat Islands M5.82025-08-28 11:07:47 UTC2.2 kmAlaska

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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