145 km E of Chignik, Alaska

Yes. A magnitude 2.4 earthquake was recorded 145 km E of Chignik, Alaska at 16:09 UTC on 2023-02-02, less than 1 km deep.

2023-02-02 16:09 UTC · 0.7 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: 2023-02-02 16:09 UTC
Magnitude: M 2.4 (ml)
Depth: 0.7 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1309 days ago · we first saw it 1309 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 21 km (13 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 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 6.9 on 2021-10-11 — about 5,600,000 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

6.9 143 km ESE of Chignik, Alaska · 36 km SSW of this epicentre Feb 13, 1951
6.9 171 km SW of Akhiok, Alaska · 45 km SSE of this epicentre Feb 6, 1964
6.3 112 km E of Chignik, Alaska · 34 km WNW of this epicentre Feb 25, 1953
6.1 132 km E of Chignik, Alaska · 16 km NW of this epicentre Sep 13, 1911
6.1 118 km ESE of Chignik, Alaska · 38 km WSW of this epicentre Mar 16, 1940

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

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

2.1 115 km E of Chignik, Alaska 19:52 UTC
1.8 111 km E of Chignik, Alaska 19:05 UTC
1.6 113 km WSW of Akhiok, Alaska 15:38 UTC
1.8 Alaska Peninsula 22:06 UTC
2.8 114 km E of Chignik, Alaska 14:37 UTC
2.5 117 km SW of Akhiok, Alaska 01:03 UTC
2.0 155 km ESE of Chignik, Alaska 06:58 UTC
2.2 128 km SSE of Ugashik, Alaska 22:40 UTC
2.6 114 km E of Chignik, Alaska 01:15 UTC
1.9 131 km SW of Akhiok, Alaska 06:29 UTC
2.2 116 km E of Chignik, Alaska 12:15 UTC
1.9 117 km SW of Akhiok, Alaska 11:42 UTC
1.8 127 km E of Chignik, Alaska 17:48 UTC
2.4 114 km E of Chignik, Alaska 14:11 UTC
3.1 124 km E of Chignik, Alaska 20:16 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 03:03 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.