87 km ENE of Chignik, Alaska

Yes. A magnitude 3.1 earthquake was recorded 87 km ENE of Chignik, Alaska at 22:07 UTC on 2022-02-18, 41 km deep.

2022-02-18 22:07 UTC · 41 km deep · released about 1,300 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: 2022-02-18 22:07 UTC
Magnitude: M 3.1 (ml)
Depth: 41 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1657 days ago · we first saw it 1657 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 7 km (4 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 17 earthquakes of M5 or more within 50 km; the five largest:

6.8 117 km SSE of Ugashik, Alaska · 39 km ENE of this epicentre May 29, 2015
6.5 60 km ENE of Chignik, Alaska · 29 km W of this epicentre Sep 28, 1941
6.4 61 km ENE of Chignik, Alaska · 33 km WNW of this epicentre Jan 1, 1963
6.4 77 km ESE of Chignik, Alaska · 40 km SSW of this epicentre Mar 24, 1972
6.4 104 km SSE of Ugashik, Alaska · 26 km NE 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

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

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
1.8 62 km E of Chignik, Alaska 10:41 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
2.3 56 km E of Chignik, Alaska 06:46 UTC
2.4 95 km ENE of Chignik, Alaska 05:25 UTC
1.7 115 km E of Chignik, Alaska 07:36 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 21:50 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.