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United States

M4.9 Earthquake near 55 km ENE of Nikolski, Alaska (United States)

UTC time: 2025-11-25 17:16:21 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.

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About this earthquake

A magnitude M4.9 earthquake was recorded near 55 km ENE of Nikolski, Alaska (United States) on November 25, 2025 at 17:16 UTC. The hypocenter lay relatively close to the surface at around 69 km, increasing how strongly it was felt. Tremors of this size are distinctly felt and can occasionally cause light damage.

The data is provided by USGS and cross-checked across seismological networks. United States: over the past 24 hours, QuakeMap24 logged 159 earthquakes, the strongest at M2.8.

Details

ID
f84c8490cc016dde00baab0efed90a9fcbd7db72
Magnitude
M4.9
Depth
68.8 km
UTC time
2025-11-25 17:16:21 UTC
Local time
—
Country
United States
City
Alaska
Source
usgs
Coordinates
53.18210, -168.14240
Temperature
5.2°C

Depth profile

Depth profile Depth: 68.8 km (Shallow) Surface Shallow Intermediate Deep 0 km 70 km 300 km 700 km 68.8 km
Shallow
68.8 km
68.8 km — deeper than the regional average (15.3 km)
Regional average: 15.3 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 29, 2026, 5:16 PM UTC · Last checked: Oct 5, 2026, 5:22 PM UTC

Updates are delayed. The last successfully retrieved data are shown.

Sep 29, 2026, 6:00 PM UTC – Sep 30, 2026, 6:00 PM UTC · Expired
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.00.20 %0–0
M ≥ 4.00.02 %0–0
M ≥ 5.0< 0.01 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0
Sep 29, 2026, 6:00 PM UTC – Oct 6, 2026, 6:00 PM UTC · Expired
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.01.39 %0–0
M ≥ 4.00.14 %0–0
M ≥ 5.00.01 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0
Sep 29, 2026, 6:00 PM UTC – Oct 29, 2026, 6:00 PM UTC
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.05.58 %0–1
M ≥ 4.00.58 %0–0
M ≥ 5.00.06 %0–0
M ≥ 6.0< 0.01 %0–0
M ≥ 7.0< 0.01 %0–0
Sep 29, 2026, 6:00 PM UTC – Sep 29, 2027, 6:00 PM UTC
MagnitudeProbability ≥ 1Count (95% interval)
M ≥ 3.035.67 %0–3
M ≥ 4.04.92 %0–1
M ≥ 5.00.51 %0–0
M ≥ 6.00.05 %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

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Alaska

Context for this earthquake

05 Oct 2025 – 05 Oct 2026 · M ≥ 3.0 · 653 Catalogue entries

Sufficiently reliable matching data are not currently available for a direct comparison. The area profile shows the available records and their limitations.

Open seismic profile

Historic earthquake map · United States

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Country statistics · United States

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View earthquake KPIs, strongest and latest events, and averages for this country.

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