QuakeIndex

Earthquake · reviewed by a seismologist

M 5.4ml

48 km ESE of Fox River, Alaska

Yes. A magnitude 5.4 earthquake was recorded 48 km ESE of Fox River, Alaska, at 9:33 am AKDT on 30 October 2025 (17:33 UTC), 24 km deep. 2,179 people have reported feeling it to USGS.

· 24 km deep · released about 1.9 kilotons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 5.4 (ml)
Depth
24 km below the surface
Felt
2,179 reports · strongest reported intensity VI
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Kenai Peninsula Borough, 142 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 50 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre.

At this magnitude and depth, people at rest would likely notice it out to about 245 km (152 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 1.9 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 89× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4× the energy of this one
  3. Magna, Utah 2020 M 5.7 2.8× the energy of this one
  4. This earthquake M 5.4 about 1.9 kilotons of TNT
  5. Around the size people start to feel M 3.0 this one released 4,000× more

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km (31 mi) since our catalogue begins in 2016. The previous largest was M 4.7 on 2022-12-12.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 6.2 43 km ESE of Halibut Cove, Alaska · 33 km SW of this epicentre
  2. 6.0 6 km SSE of Fox River, Alaska · 43 km WNW of this epicentre
  3. 5.6 52 km S of Lowell Point, Alaska · 41 km E of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 59.6308, -150.2328. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kenai Peninsula Borough, AK 142 km (88 mi) NW earthquakes near Kenai Peninsula Borough

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

57 earthquakes have been recorded within 50 km since this one.

  1. 2.1 48 km ESE of Fox River, Alaska
  2. 1.9 19 km SSE of Fox River, Alaska
  3. 1.5 42 km WSW of Lowell Point, Alaska
  4. 1.9 15 km ESE of Fox River, Alaska
  5. 2.5 18 km SE of Fox River, Alaska
  6. 3.4 30 km NE of Fox River, Alaska
  7. 1.5 41 km SE of Fox River, Alaska
  8. 3.8 32 km E of Halibut Cove, Alaska
  9. 1.9 34 km ESE of Halibut Cove, Alaska
  10. 1.8 17 km SE of Fox River, Alaska
  11. 2.0 21 km ENE of Fox River, Alaska
  12. 1.9 23 km SE of Fox River, Alaska
  13. 1.8 46 km ESE of Fox River, Alaska
  14. 1.7 11 km ENE of Fox River, Alaska
  15. 2.3 27 km SE of Fox River, Alaska

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.