M5.1 Earthquake near 92 km SE of Atka, Alaska

UTC time: 2026-07-23 09:30:19 UTC Local time: —

Archive record · original publication time was not recorded Content updated: 2026-09-06 13:00:22 UTC

Automatically generated from measurement data by QuakeMap24. Values may change after further analysis. How our reports are produced ↗

Magnitude

M5.1

Depth: 35.0 km
Source: USGS

92 km SE of Atka, Alaska

Map

About this earthquake

A magnitude M5.1 earthquake was recorded near 92 km SE of Atka, Alaska on July 23, 2026 at 09:30 UTC. The hypocenter lay relatively close to the surface at around 35 km, increasing how strongly it was felt. Events of this size can cause damage near the epicenter.

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

Details

b4065a82539edab05ba840f806e1240e8db3de30

Magnitude

M5.1

Depth

35.0 km

UTC time

2026-07-23 09:30:19 UTC

Local time

—

Country

—

Source

usgs

Coordinates

51.60400, -173.24840

Temperature

10.1°C

Depth profile

Shallow

35 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 3, 2026, 9:30 AM UTC · Last checked: Sep 7, 2026, 12:22 AM UTC

Sep 3, 2026, 10:00 AM UTC – Sep 4, 2026, 10:00 AM UTC · Expired

Magnitude	Probability ≥ 1	Count (95% interval)
M ≥ 3.0	11.49 %	0–1
M ≥ 4.0	1.22 %	0–0
M ≥ 5.0	0.12 %	0–0
M ≥ 6.0	0.01 %	0–0
M ≥ 7.0	< 0.01 %	0–0

Sep 3, 2026, 10:00 AM UTC – Sep 10, 2026, 10:00 AM UTC

Magnitude	Probability ≥ 1	Count (95% interval)
M ≥ 3.0	53.98 %	0–3
M ≥ 4.0	7.76 %	0–1
M ≥ 5.0	0.81 %	0–0
M ≥ 6.0	0.08 %	0–0
M ≥ 7.0	< 0.01 %	0–0

Sep 3, 2026, 10:00 AM UTC – Oct 3, 2026, 10:00 AM UTC

Magnitude	Probability ≥ 1	Count (95% interval)
M ≥ 3.0	91.85 %	0–7
M ≥ 4.0	24.86 %	0–2
M ≥ 5.0	2.86 %	0–1
M ≥ 6.0	0.29 %	0–0
M ≥ 7.0	0.03 %	0–0

Sep 3, 2026, 10:00 AM UTC – Sep 3, 2027, 10:00 AM UTC

Magnitude	Probability ≥ 1	Count (95% interval)
M ≥ 3.0	99.97 %	4–27
M ≥ 4.0	71.80 %	0–4
M ≥ 5.0	12.65 %	0–1
M ≥ 6.0	1.35 %	0–0
M ≥ 7.0	0.14 %	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

III

Weak · Intensity (MMI) III

Felt by a few, no damage.

Tectonic context

Located on the North America Plate.

Near the boundary North America ↔ Pacific · about 51 km away

Volcanoes nearby

Seguam

Distance: 94 km ·Stratovolcano(es) ·Elevation: 1'054 m ·Last eruption: 1993 ·United States
Atka Volcanic Complex

Distance: 101 km ·Stratovolcano(es) ·Elevation: 1'518 m ·Last eruption: 2025 ·United States
Koniuji

Distance: 146 km ·Stratovolcano ·Elevation: 273 m ·Last eruption: -1150 ·United States
Kasatochi

Distance: 168 km ·Stratovolcano ·Elevation: 314 m ·Last eruption: 2008 ·United States
Amukta

Distance: 169 km ·Stratovolcano ·Elevation: 1'066 m ·Last eruption: 1996 ·United States
Chagulak

Distance: 180 km ·Stratovolcano ·Elevation: 1'028 m ·United States

Radius · 100 km

Nearby infrastructure

Up to 3 nearest sites per category

Airports

Atka AirportUnited States · AKB · PAAK
94.9 kmStraight-line distance

Source: OurAirports · Dataset date: 2026-09-06

This selection shows geographic proximity, not a hazard zone or confirmed impacts. Distances use recorded site coordinates. Sources & data dates

Subsequent earthquakes nearby

Events recorded after this earthquake within 150 km. They are not automatically classified as aftershocks.

First 6 hours0

First 24 hours0

First 72 hours5

Strongest subsequent eventM5.8

M5.02026-07-25 21:03:13 UTC5.8 kmAndreanof Islands, Aleutian Islands M4.02026-07-25 23:31:43 UTC54.5 kmANDREANOF ISLANDS, ALEUTIAN IS. M4.12026-07-26 01:57:11 UTC16.6 km80 km SE of Atka, Alaska M5.82026-07-26 08:35:19 UTC12.3 km99 km SE of Atka, Alaska M5.82026-07-26 08:35:26 UTC50.9 kmUnorganized Borough M4.72026-07-26 13:18:43 UTC21.2 kmAndreanof Islands, Aleutian Islands M3.72026-07-26 16:06:59 UTC11.4 kmANDREANOF ISLANDS, ALEUTIAN IS. M3.92026-07-26 17:16:12 UTC133.8 kmANDREANOF ISLANDS, ALEUTIAN IS. M3.92026-07-27 10:12:07 UTC41.5 km128 km SSE of Atka, Alaska M3.82026-07-31 08:02:07 UTC24.0 km102 km SSE of Atka, Alaska M0.52026-07-31 18:07:50 UTC105.2 kmUnorganized Borough M4.92026-08-01 23:07:00 UTC15.2 kmAndreanof Islands, Aleutian Islands

Comparison of seismic sources

3 sources currently report magnitudes from M5.1 to M5.1.

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

SourceMagnitudeDepthPosition difference

GFZM5.110.0 km7.4 km

USGSM5.15.0 km17.8 km

EMSCM5.134.0 km1.7 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#12

Earlier events M≥462

Earlier events M≥518

Compared since2025-01-13

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

Strongest earlier events

M6.22025-09-03 20:57:41 UTC80.1 km87 km SW of Nikolski, Alaska M5.62026-05-22 12:16:14 UTC145.6 km###.# km ( ###.# mi) NW (az= 304.0) from Port Orford, OR M5.62026-05-22 12:16:13 UTC136.7 kmFox Islands, Aleutian Islands M5.62026-05-22 12:16:13 UTC144.4 kmFOX ISLANDS, ALEUTIAN ISLANDS M5.42025-11-09 09:36:48 UTC144.6 km208 km SW of Nikolski, Alaska

Stats (last 24h)

Global (24h)

504

Country (24h)

—

Current earthquakes in

Magnitude Place Local time

No recent events available.