123 km ESE of Chignik, Alaska

Yes. A magnitude 2.4 earthquake was recorded 123 km ESE of Chignik, Alaska at 23:20 UTC on 2026-05-20, 266 km deep. The magnitude and location are an automatic first estimate and may change.

2026-05-20 23:20 UTC · 266 km deep · released about 120 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: 2026-05-20 23:20 UTC
Magnitude: M 2.4 (ml)
Depth: 266 km below the surface
Felt: no reports yet
Status: Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS 175 days ago · we first saw it 175 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause 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 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
Magna, Utah 2020 M 5.7 89,000× the energy of this one
Around the size people start to feel M 3.0 7.9× the energy of this one
This earthquake M 2.4 about 120 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 5.9 on 2021-07-29 — about 180,000 times the energy of this one.

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

7.0 113 km ESE of Chignik, Alaska · 16 km N of this epicentre May 4, 1923
7.0 164 km SE of Chignik, Alaska · 46 km SSE of this epicentre Sep 4, 1989
6.9 143 km ESE of Chignik, Alaska · 31 km ENE of this epicentre Feb 13, 1951
6.7 121 km SE of Chignik, Alaska · 38 km SW of this epicentre Feb 13, 1979
6.6 128 km SE of Chignik, Alaska · 8 km S of this epicentre Jul 28, 1934

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

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Aftershocks so far

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

2.4 131 km SE of Chignik, Alaska 16:05 UTC
2.1 142 km SE of Chignik, Alaska 00:04 UTC
1.6 91 km ESE of Chignik, Alaska 22:31 UTC
1.9 87 km ESE of Chignik, Alaska 04:14 UTC
3.9 84 km ESE of Chignik, Alaska 01:57 UTC
2.4 134 km SE of Chignik, Alaska 16:16 UTC
2.1 128 km ESE of Chignik, Alaska 13:55 UTC
2.3 136 km ESE of Chignik, Alaska 15:19 UTC
1.7 78 km ESE of Chignik, Alaska 08:27 UTC
2.4 79 km ESE of Chignik, Alaska 13:25 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 23:45 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.