100 km E of Chignik, Alaska

Yes. A magnitude 2.2 earthquake was recorded 100 km E of Chignik, Alaska at 21:11 UTC on 2022-04-02, 72 km deep.

2022-04-02 21:11 UTC · 72 km deep · released about 60 lb of TNT

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: 2022-04-02 21:11 UTC
Magnitude: M 2.2 (ml)
Depth: 72 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1615 days ago · we first saw it 1615 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 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
Magna, Utah 2020 M 5.7 180,000× the energy of this one
Around the size people start to feel M 3.0 16× the energy of this one
This earthquake M 2.2 about 60 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 6.9 on 2021-10-11 — about 11,000,000 times the energy of this one.

Before 2016, the USGS record lists 18 earthquakes of M5 or more within 50 km; the five largest:

6.8 117 km SSE of Ugashik, Alaska · 27 km ENE of this epicentre May 29, 2015
6.5 60 km ENE of Chignik, Alaska · 43 km W of this epicentre Sep 28, 1941
6.4 61 km ENE of Chignik, Alaska · 46 km WNW of this epicentre Jan 1, 1963
6.4 77 km ESE of Chignik, Alaska · 45 km SSW of this epicentre Mar 24, 1972
6.4 104 km SSE of Ugashik, Alaska · 20 km NNE of this epicentre May 20, 1979

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

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

1.6 121 km E of Chignik, Alaska 20:39 UTC
1.6 107 km SE of Ugashik, Alaska 21:36 UTC
4.2 113 km E of Chignik, Alaska 13:15 UTC
3.0 114 km E of Chignik, Alaska 13:09 UTC
2.1 101 km E of Chignik, Alaska 17:19 UTC
2.5 108 km E of Chignik, Alaska 08:08 UTC
1.9 109 km SSE of Ugashik, Alaska 17:56 UTC
2.5 118 km E of Chignik, Alaska 20:41 UTC
1.8 114 km E of Chignik, Alaska 03:13 UTC
2.4 114 km E of Chignik, Alaska 20:53 UTC
2.3 116 km E of Chignik, Alaska 16:08 UTC
1.7 102 km E of Chignik, Alaska 07:33 UTC
1.8 120 km SSE of Ugashik, Alaska 18:40 UTC
2.2 112 km SSE of Ugashik, Alaska 13:08 UTC
1.6 116 km ESE of Chignik, Alaska 19:20 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 22:30 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.