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M5.5 Depth: 83.8 km

M5.5 Earthquake near RAT ISLANDS, ALEUTIAN ISLANDS (United States)

UTC time: 2025-08-29 09:14:25 UTC Local time: —

About this earthquake

On August 29, 2025 at 09:14 UTC, a magnitude M5.5 earthquake occurred near RAT ISLANDS, ALEUTIAN ISLANDS (United States). The earthquake originated at an intermediate depth of about 84 km. Events of this size can cause damage near the epicenter.

The event was recorded by EMSC. United States: over the past 24 hours, QuakeMap24 logged 163 earthquakes, the strongest at M3.6.

Details

Magnitude
M5.5
Depth
83.8 km
UTC time
2025-08-29 09:14:25 UTC
Local time
—
Country
United States
City
Alaska
Source
emsc
Coordinates
51.69340, 179.57620
Temperature
12.2°C

Map

Depth profile

Depth profile Depth: 83.8 km (Intermediate) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 83.8 km
Intermediate
83.8 km
83.8 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: 26 km ·Stratovolcano ·Elevation: 1'221 m ·Last eruption: 2023 ·United States
  • Little Sitkin
    Distance: 77 km ·Stratovolcano ·Elevation: 1'174 m ·Last eruption: 1830 ·United States
  • Davidof
    Distance: 91 km ·Stratovolcano ·Elevation: 328 m ·United States
  • Segula
    Distance: 105 km ·Stratovolcano ·Elevation: 1'160 m ·United States
  • Kiska
    Distance: 143 km ·Stratovolcano ·Elevation: 1'220 m ·Last eruption: 1990 ·United States
  • Buldir
    Distance: 261 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 hours1
First 24 hours1
First 72 hours1
Strongest subsequent eventM5.0
M5.02025-08-29 09:14:26 UTC17.3 kmAlaska M5.02025-09-13 01:58:48 UTC6.1 kmRat Islands, Aleutian Islands M4.52025-09-13 01:58:55 UTC25.6 kmAlaska M4.52025-09-13 01:58:56 UTC21.4 km M4.52025-09-16 19:10:30 UTC96.8 kmRat Islands, Aleutian Islands, Alaska M3.22025-09-17 01:13:38 UTC43.4 km230 km WSW of Adak, Alaska M3.02025-09-17 01:13:38 UTC40.0 km M0.72025-09-19 22:17:08 UTC27.5 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 UTC57.7 kmRat Islands, Aleutian Islands M5.92025-08-28 11:07:50 UTC50.6 kmRat Islands, Aleutian Islands, United States [Sea: United States] M5.92025-08-28 11:07:48 UTC39.3 km241 km W of Adak, Alaska M5.92025-08-28 11:07:48 UTC62.6 km M5.92025-08-28 11:07:48 UTC52.1 kmRat Islands

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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