QuakeIndex

Earthquake · automatic estimate, may change

M 2.5ml

47 km N of Petersville, Alaska

Yes. A magnitude 2.5 earthquake was recorded 47 km N of Petersville, Alaska, at 2:07 am AKDT on 17 October 2026 (10:07 UTC), 111 km deep. The magnitude and location are an automatic first estimate and may change.

· 111 km deep · released about 170 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Denali Borough 93 kmMatanuska-Susitna Borough 99 km
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 2.5 (ml)
Depth
111 km below the surface
Felt
no reports yet
Nearest
Denali Borough, 93 km NNE
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 31 hours ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. 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 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 lb of TNT

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 since 2016 was M 5.3 on 2016-05-15 — about 16,000 times the energy of this one.

Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:

  1. 5.7 66 km ESE of Denali National Park, Alaska · 34 km NNE of this epicentre
  2. 5.5 59 km SE of Denali National Park, Alaska · 24 km NNW of this epicentre
  3. 5.4 70 km WSW of Cantwell, Alaska · 39 km NE of this epicentre
  4. 5.4 48 km N of Petersville, Alaska · 8 km E of this epicentre
  5. 5.3 71 km SE of Denali National Park, Alaska · 33 km NNE 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 62.9240, -150.8150. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Denali Borough, AK 93 km (58 mi) NNE earthquakes near Denali Borough
Matanuska-Susitna Borough, AK 99 km (62 mi) SE earthquakes near Matanuska-Susitna Borough

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

Aftershocks so far

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

  1. 1.7 46 km NNW of Petersville, Alaska
  2. 1.8 59 km SE of Denali National Park, Alaska
  3. 2.0 58 km NNW of Petersville, Alaska
  4. 1.4 32 km WNW of Petersville, 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.

Revisions

USGS refines a solution as more stations report. Every change we have seen is listed here.

What changedFromToWhen
magnitude2.32.5
location48 km N of Petersville, Alaska47 km N of Petersville, Alaska
longitude-150.82-150.81
latitude62.9362.92
depth110.8111.4
magnitude2.22.3

On USGS

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