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M5.6 Depth: 19.8 km

M5.6 Earthquake near 123 km SW of Adak, Alaska

UTC time: 2025-09-21 09:30:27 UTC Local time: —

About this earthquake

A magnitude M5.6 earthquake was recorded near 123 km SW of Adak, Alaska on September 21, 2025 at 09:30 UTC. With a focal depth of about 20 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Events of this size can cause damage near the epicenter.

The data is provided by USGS and cross-checked across seismological networks.

Details

Magnitude
M5.6
Depth
19.8 km
UTC time
2025-09-21 09:30:27 UTC
Local time
—
Country
—
Source
usgs
Coordinates
51.17360, -178.00790
Temperature
9.5°C

Map

Depth profile

Depth profile Depth: 19.8 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 19.8 km
Shallow
19.8 km
Why depth matters

Shallow quakes release energy near the surface — shaking is felt more strongly and damage potential is higher.

Depth classes per USGS

Volcanoes nearby

  • Takawangha
    Distance: 78 km ·Stratovolcano ·Elevation: 1'449 m ·Last eruption: 1550 ·United States
  • Tanaga
    Distance: 80 km ·Stratovolcano(es) ·Elevation: 1'806 m ·Last eruption: 1914 ·United States
  • Gareloi
    Distance: 88 km ·Stratovolcano ·Elevation: 1'573 m ·Last eruption: 1989 ·United States
  • Bobrof
    Distance: 91 km ·Stratovolcano ·Elevation: 738 m ·United States
  • Kanaga
    Distance: 102 km ·Stratovolcano ·Elevation: 1'307 m ·Last eruption: 2023 ·United States
  • Moffett
    Distance: 122 km ·Stratovolcano ·Elevation: 1'196 m ·Last eruption: -1600 ·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 hours2
First 72 hours2
Strongest subsequent eventM5.7
M5.52025-09-21 09:30:30 UTC22.4 kmAlaska M5.72025-09-21 09:30:33 UTC12.5 kmAndreanof Islands, Aleutian Islands, United States [Sea: United States] M3.62025-09-24 21:21:20 UTC137.3 km89 km SSE of Adak, Alaska M3.42025-09-28 20:31:17 UTC80.6 km100 km S of Adak, Alaska M2.92025-10-04 18:45:13 UTC130.7 km244 km WSW of Adak, Alaska M4.02025-10-05 01:51:45 UTC109.4 km M4.32025-10-05 01:51:46 UTC112.5 km200 km W of Adak, Alaska M5.02025-10-11 13:51:15 UTC119.4 kmAndreanof Islands, Aleutian Islands M4.52025-10-11 13:51:18 UTC129.8 km M5.02025-10-20 18:45:26 UTC71.4 km M5.02025-10-20 18:45:29 UTC68.7 kmAndreanof Islands, Aleutian Islands

Historical context nearby

Comparison with recorded earthquakes before this event within 150 km.

Magnitude rank#3
Earlier events M≥452
Earlier events M≥519
Compared since2025-01-02

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

Strongest earlier events

M6.22025-03-21 14:53:41 UTC135.1 km88 km SSE of Adak, Alaska M6.22025-03-21 14:53:43 UTC127.5 kmAndreanof Islands, Aleutian Islands M5.62025-03-22 09:49:21 UTC132.1 km87 km SSE of Adak, Alaska M5.62025-03-20 04:28:52 UTC132.3 km87 km SSE of Adak, Alaska M5.52025-09-21 09:30:26 UTC10.7 kmAndreanof Islands, Aleutian Islands

Stats (last 24h)

Global (24h)
650
Country (24h)
—
—
Current earthquakes in
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