112 km E of Chignik, Alaska

Yes. A magnitude 3.1 earthquake was recorded 112 km E of Chignik, Alaska at 23:46 UTC on 2025-10-07, 37 km deep. The magnitude and location are an automatic first estimate and may change.

2025-10-07 23:46 UTC · 37 km deep · released about 1,300 lb of TNT

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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: 2025-10-07 23:46 UTC
Magnitude: M 3.1 (ml)
Depth: 37 km below the surface
Felt: no reports yet
Status: Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS 328 days ago · we first saw it 328 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 20 km (12 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 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

Northridge, California 1994 M 6.7 250,000× the energy of this one
Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
Magna, Utah 2020 M 5.7 7,900× the energy of this one
This earthquake M 3.1 about 1,300 lb of TNT
Around the size people start to feel M 3.0 this one released 1.4× 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 since 2016 was M 6.9 on 2021-10-11 — about 500,000 times the energy of this one.

Before 2016, the USGS record lists 15 earthquakes of M5 or more within 50 km; the five largest:

6.8 117 km SSE of Ugashik, Alaska · 29 km NNE of this epicentre May 29, 2015
6.4 77 km ESE of Chignik, Alaska · 45 km WSW of this epicentre Mar 24, 1972
6.4 104 km SSE of Ugashik, Alaska · 34 km NNW of this epicentre May 20, 1979
6.3 112 km E of Chignik, Alaska · 18 km S of this epicentre Feb 25, 1953
6.1 132 km E of Chignik, Alaska · 26 km SE of this epicentre Sep 13, 1911

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

Map loads when it scrolls into view

Aftershocks so far

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

2.4 84 km E of Chignik, Alaska 06:25 UTC
2.5 117 km ESE of Chignik, Alaska 14:15 UTC
2.5 114 km E of Chignik, Alaska 18:53 UTC
2.1 114 km E of Chignik, Alaska 17:43 UTC
2.2 119 km E of Chignik, Alaska 00:50 UTC
2.2 83 km E of Chignik, Alaska 17:20 UTC
2.1 107 km SSE of Ugashik, Alaska 02:31 UTC
2.2 95 km SSE of Ugashik, Alaska 13:56 UTC
2.9 115 km E of Chignik, Alaska 23:28 UTC
2.1 108 km ENE of Chignik, Alaska 19:49 UTC
1.7 82 km E of Chignik, Alaska 15:57 UTC
1.8 82 km E of Chignik, Alaska 12:49 UTC
1.9 97 km ESE of Chignik, Alaska 16:50 UTC
2.0 106 km ESE of Chignik, Alaska 07:16 UTC
1.9 102 km E of Chignik, Alaska 14:12 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 03:20 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

The official USGS event page — the source of record for every value above
Did you feel it? Report it to USGS — reports go to USGS, not to us
ShakeMap for this event, when USGS has produced one

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