south of Alaska

Yes. A magnitude 2.7 earthquake was recorded south of Alaska at 03:42 UTC on 2022-09-04, 25 km deep.

2022-09-04 03:42 UTC · 25 km deep · released about 340 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: 2022-09-04 03:42 UTC
Magnitude: M 2.7 (ml)
Depth: 25 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1459 days ago · we first saw it 1459 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 4 km (2 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 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
Magna, Utah 2020 M 5.7 32,000× the energy of this one
Around the size people start to feel M 3.0 2.8× the energy of this one
This earthquake M 2.7 about 340 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 63,000 times the energy of this one.

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

7.0 164 km SE of Chignik, Alaska · 26 km E of this epicentre Sep 4, 1989
6.7 121 km SE of Chignik, Alaska · 25 km NW of this epicentre Feb 13, 1979
6.6 128 km SE of Chignik, Alaska · 35 km NNE of this epicentre Jul 28, 1934
6.2 189 km SE of Chignik, Alaska · 45 km SSE of this epicentre Mar 18, 1945
6.0 168 km SE of Chignik, Alaska · 25 km ESE of this epicentre Nov 16, 1938

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

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

2.7 193 km SE of Chignik, Alaska 21:43 UTC
3.4 194 km SE of Chignik, Alaska 10:23 UTC
4.7 south of Alaska 05:23 UTC
2.6 165 km SE of Chignik, Alaska 04:48 UTC
1.9 125 km SE of Chignik, Alaska 20:36 UTC
3.0 south of Alaska 09:37 UTC
2.9 167 km SSE of Chignik, Alaska 22:47 UTC
2.2 142 km SE of Perryville, Alaska 06:29 UTC
2.2 112 km SE of Chignik, Alaska 20:36 UTC
2.6 Alaska Peninsula 15:26 UTC
2.6 150 km SE of Chignik, Alaska 16:42 UTC
4.7 150 km SE of Chignik, Alaska 07:04 UTC
2.1 126 km SSE of Chignik, Alaska 19:23 UTC
2.4 137 km SE of Chignik, Alaska 16:57 UTC
2.6 127 km SE of Chignik, Alaska 19:13 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 07:57 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.