182 km SE of Akutan, Alaska

Yes. A magnitude 2.3 earthquake was recorded 182 km SE of Akutan, Alaska at 18:57 UTC on 2021-03-11, 20 km deep.

2021-03-11 18:57 UTC · 20 km deep · released about 85 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: 2021-03-11 18:57 UTC
Magnitude: M 2.3 (ml)
Depth: 20 km below the surface
Felt: no reports yet
Nearest mapped fault: Alaska-Aleutian subduction zone, 10 km from its surface trace — near is not the same as on
Status: Reviewed by a seismologist

USGS · last changed by USGS 2002 days ago · we first saw it 2002 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 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
Magna, Utah 2020 M 5.7 130,000× the energy of this one
Around the size people start to feel M 3.0 11× the energy of this one
This earthquake M 2.3 about 85 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 4.8 on 2018-02-27 — about 5,600 times the energy of this one.

Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:

6.2 184 km SE of Akutan, Alaska · 35 km NE of this epicentre Apr 6, 1946
6.2 156 km SE of Akutan, Alaska · 28 km NNW of this epicentre Nov 12, 1946
6.0 195 km S of False Pass, Alaska · 44 km ENE of this epicentre Aug 14, 1924
5.5 218 km SE of Akutan, Alaska · 41 km SSE of this epicentre May 3, 2010
5.4 149 km SE of Akutan, Alaska · 37 km WNW of this epicentre Dec 1, 1998

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

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

2.2 136 km SE of Akutan, Alaska 04:37 UTC
2.2 228 km SE of Akutan, Alaska 10:07 UTC
2.5 177 km SE of Akutan, Alaska 05:10 UTC
2.0 143 km SE of Akutan, Alaska 13:42 UTC
3.1 153 km SE of Akutan, Alaska 02:18 UTC
3.1 194 km SE of Akutan, Alaska 01:38 UTC
2.9 190 km SE of Akutan, Alaska 07:48 UTC
2.4 138 km SE of Akutan, Alaska 11:03 UTC
3.9 146 km SE of Akutan, Alaska 17:07 UTC
2.9 140 km SE of Akutan, Alaska 00:26 UTC
2.6 209 km SE of Akutan, Alaska 18:29 UTC
2.6 195 km SE of Akutan, Alaska 12:32 UTC
2.4 217 km SE of Akutan, Alaska 05:31 UTC
2.8 177 km S of False Pass, Alaska 10:17 UTC
2.6 172 km S of False Pass, Alaska 13:53 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 20:04 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.