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M5.3 Earthquake near 151 km WSW of Adak, Alaska

UTC time: 2026-09-11 10:47:12 UTC Local time: —

Earthquake newsQuakeMap24

First published: 2026-09-11 10:53:06 UTC Content updated: 2026-09-11 11:31:06 UTC

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

Magnitude

M5.3

Depth: 40.9 km
Source: USGS

151 km WSW of Adak, Alaska

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About this earthquake

A magnitude M5.3 earthquake was recorded near 151 km WSW of Adak, Alaska on September 11, 2026 at 10:47 UTC. With a focal depth of about 41 km, this was a shallow earthquake, whose shaking is usually felt more strongly at the surface. Earthquakes of this magnitude can damage poorly built structures.

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

Details

f7a938483a8d3abe3a35a00583f918fb7c169625

Magnitude

M5.3

Depth

40.9 km

UTC time

2026-09-11 10:47:12 UTC

Local time

—

Country

—

Source

usgs

Coordinates

51.21300, -178.54290

Temperature

12.7°C

Depth profile

Shallow

40.9 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

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: Sep 11, 2026, 11:17 AM UTC · Last checked: Sep 11, 2026, 11:30 AM UTC

Sep 11, 2026, 11:20 AM UTC – Sep 12, 2026, 11:20 AM UTC

Magnitude	Probability ≥ 1	Count (95% interval)
M ≥ 3.0	70.40 %	0–49
M ≥ 4.0	28.63 %	0–5
M ≥ 5.0	5.64 %	0–1
M ≥ 6.0	0.66 %	0–0
M ≥ 7.0	0.07 %	0–0

Sep 11, 2026, 11:20 AM UTC – Sep 18, 2026, 11:20 AM UTC

Magnitude	Probability ≥ 1	Count (95% interval)
M ≥ 3.0	79.62 %	0–88
M ≥ 4.0	38.58 %	0–9
M ≥ 5.0	9.12 %	0–1
M ≥ 6.0	1.16 %	0–0
M ≥ 7.0	0.12 %	0–0

Sep 11, 2026, 11:20 AM UTC – Oct 11, 2026, 11:20 AM UTC

Magnitude	Probability ≥ 1	Count (95% interval)
M ≥ 3.0	84.19 %	0–124
M ≥ 4.0	44.94 %	0–13
M ≥ 5.0	11.86 %	0–2
M ≥ 6.0	1.62 %	0–0
M ≥ 7.0	0.17 %	0–0

Sep 11, 2026, 11:20 AM UTC – Sep 11, 2027, 11:20 AM UTC

Magnitude	Probability ≥ 1	Count (95% interval)
M ≥ 3.0	89.51 %	0–203
M ≥ 4.0	54.34 %	0–21
M ≥ 5.0	16.79 %	0–3
M ≥ 6.0	2.58 %	0–1
M ≥ 7.0	0.28 %	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

Ground shaking

Moderate · Intensity (MMI) V

Felt by all, slight damage possible.

Tectonic context

Located on the North America Plate.

Near the boundary North America ↔ Pacific · about 68 km away

Volcanoes nearby

Gareloi

Distance: 66 km ·Stratovolcano ·Elevation: 1'573 m ·Last eruption: 1989 ·United States
Tanaga

Distance: 80 km ·Stratovolcano(es) ·Elevation: 1'806 m ·Last eruption: 1914 ·United States
Takawangha

Distance: 82 km ·Stratovolcano ·Elevation: 1'449 m ·Last eruption: 1550 ·United States
Bobrof

Distance: 109 km ·Stratovolcano ·Elevation: 738 m ·United States
Kanaga

Distance: 124 km ·Stratovolcano ·Elevation: 1'307 m ·Last eruption: 2023 ·United States
Moffett

Distance: 148 km ·Stratovolcano ·Elevation: 1'196 m ·Last eruption: -1600 ·United States

Comparison of seismic sources

4 sources currently report magnitudes from M5.0 to M5.7.

Measurements can differ because agencies use different networks and calculation methods. Values may be revised.

SourceMagnitudeDepthPosition difference

GFZM5.410.0 km46.6 km

RESIFM5.010.0 km36.3 km

USGSM5.713.4 km0.0 km

EMSCM5.440.4 km29.8 km

No unambiguous area assignment

Context for this earthquake

This event has no unambiguous country assignment in the analysed catalogue. It is therefore not assigned to a regional profile.

Earthquake overview

Historical context nearby

Comparison with recorded earthquakes before this event within 150 km.

Magnitude rank#28

Earlier events M≥4100

Earlier events M≥555

Compared since2025-01-02

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

Strongest earlier events

M5.92026-05-09 04:42:25 UTC139.4 kmRat Islands, Aleutian Islands, United States [Sea: United States] M5.92025-08-28 11:07:50 UTC146.1 kmRat Islands, Aleutian Islands, United States [Sea: United States] M5.92025-08-28 11:07:48 UTC146.9 km241 km W of Adak, Alaska M5.82025-11-23 08:21:45 UTC105.7 km65 km SSW of Adak, Alaska M5.82026-05-09 04:42:26 UTC145.0 kmRAT ISLANDS, ALEUTIAN ISLANDS

Stats (last 24h)

Global (24h)

715

Country (24h)

—

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