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M5.5 Earthquake near Rat Islands, Aleutian Islands, Alaska (United States)

UTC time: 2025-12-13 10:51:00 UTC Local time: —
Earthquake newsQuakeMap24
Archive record · original publication time was not recorded Content updated:

Automatically generated from measurement data by QuakeMap24. Values may change after further analysis.

Map

M5.5 Earthquake near Rat Islands, Aleutian Islands, Alaska (United States) · 2025-12-13 — Map showing the location of the epicenter
M5.5 Earthquake near Rat Islands, Aleutian Islands, Alaska (United States) · 2025-12-13 — Map showing the location of the epicenter

About this earthquake

On December 13, 2025 at 10:51 UTC, a magnitude M5.5 earthquake occurred near Rat Islands, Aleutian Islands, Alaska (United States). The earthquake originated at an intermediate depth of about 110 km. Earthquakes of this magnitude can damage poorly built structures.

The event was recorded by USGS. United States: 172 earthquakes were recorded in the past 24 hours, the strongest reaching M3.6.

Details

ID
631bf6ad2fbcf3bbc69392a43bf46d9b5514566c
Magnitude
M5.5
Depth
109.6 km
UTC time
2025-12-13 10:51:00 UTC
Local time
—
Country
United States
City
Alaska
Source
usgs
Coordinates
51.92340, 178.33730
Temperature
3.8°C

Depth profile

Depth profile Depth: 109.6 km (Intermediate) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 109.6 km
Intermediate
109.6 km
109.6 km — deeper than the regional average (15.2 km)
Regional average: 15.2 km
Why depth matters

Intermediate-depth quakes are felt across a wider area but usually cause less surface damage.

Depth classes per USGS

Official USGS aftershock forecast

Probability of at least one aftershock at or above the specified magnitude during the entire stated time window. This does not predict an individual earthquake.

Issued: Oct 3, 2026, 10:51 AM UTC · Last checked: Oct 4, 2026, 9:07 PM UTC

Oct 3, 2026, 11:00 AM UTC – Oct 4, 2026, 11:00 AM UTC · Expired
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.00.14 %0–0
M ≥ 4.00.01 %0–0
M ≥ 5.0< 0.01 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0
Oct 3, 2026, 11:00 AM UTC – Oct 10, 2026, 11:00 AM UTC
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.00.94 %0–0
M ≥ 4.00.09 %0–0
M ≥ 5.0< 0.01 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0
Oct 3, 2026, 11:00 AM UTC – Nov 2, 2026, 11:00 AM UTC
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.03.79 %0–1
M ≥ 4.00.39 %0–0
M ≥ 5.00.04 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0
Oct 3, 2026, 11:00 AM UTC – Oct 3, 2027, 11:00 AM UTC
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.025.68 %0–2
M ≥ 4.03.30 %0–1
M ≥ 5.00.34 %0–0
M ≥ 6.00.03 %0–0
M ≥ 7.0< 0.01 %0–0

The range is the 95% forecast interval for the number of earthquakes. Magnitude thresholds and time windows overlap: do not add the values. Windows already in progress still refer to the entire stated period.

Source: USGS — Operational Aftershock Forecast

Volcanoes nearby

  • Davidof
    Distance: 5 km ·Stratovolcano ·Elevation: 328 m ·United States
  • Little Sitkin
    Distance: 14 km ·Stratovolcano ·Elevation: 1'174 m ·Last eruption: 1830 ·United States
  • Segula
    Distance: 17 km ·Stratovolcano ·Elevation: 1'160 m ·United States
  • Kiska
    Distance: 54 km ·Stratovolcano ·Elevation: 1'220 m ·Last eruption: 1990 ·United States
  • Semisopochnoi
    Distance: 85 km ·Stratovolcano ·Elevation: 1'221 m ·Last eruption: 2023 ·United States
  • Buldir
    Distance: 172 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 eventM5.7
M5.72025-12-13 10:51:01 UTC11.4 kmRat Islands, Aleutian Islands, United States [Sea: United States] M4.92026-01-06 10:57:15 UTC103.2 kmRat Islands, Aleutian Islands M4.82026-01-06 10:57:17 UTC126.1 kmRat Islands, Aleutian Islands, Alaska M4.82026-01-06 10:57:17 UTC125.0 kmRAT ISLANDS, ALEUTIAN ISLANDS

Alaska

Context for this earthquake

04 Oct 2025 – 04 Oct 2026 · M ≥ 3.0 · 653 Catalogue entries

Of 652 other entries for this area and period, 15 have a higher stored magnitude. Different magnitude types and reports not yet merged limit the comparison.

Open seismic profile

Historical context nearby

Comparison with recorded earthquakes before this event within 150 km.

Magnitude rank#13
Earlier events M≥451
Earlier events M≥534
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 UTC105.6 kmRat Islands, Aleutian Islands M5.92025-08-28 11:07:50 UTC113.8 kmRat Islands, Aleutian Islands, United States [Sea: United States] M5.92025-08-28 11:07:48 UTC104.7 km241 km W of Adak, Alaska M5.92025-08-28 11:07:48 UTC111.8 kmRAT ISLANDS, ALEUTIAN ISLANDS M5.92025-08-28 11:07:48 UTC106.0 kmRat Islands

Historic earthquake map · United States

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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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