231 km SSE of Atka, Alaska

Yes. A magnitude 2.3 earthquake was recorded 231 km SSE of Atka, Alaska at 06:01 UTC on 2020-09-26, 7.6 km deep.

2020-09-26 06:01 UTC · 7.6 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: 2020-09-26 06:01 UTC
Magnitude: M 2.3 (ml)
Depth: 7.6 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 2227 days ago · we first saw it 2227 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 18 km (11 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 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 4.5 on 2017-01-10 — about 2,000 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

6.2 234 km SSE of Atka, Alaska · 31 km ENE of this epicentre Mar 20, 1958
6.0 234 km SSE of Atka, Alaska · 16 km WSW of this epicentre Nov 9, 1929
5.6 198 km SSE of Atka, Alaska · 35 km N of this epicentre Mar 7, 2015
5.5 232 km SSE of Atka, Alaska · 9 km E of this epicentre Jul 13, 1981
5.4 198 km SSE of Atka, Alaska · 35 km NW of this epicentre Feb 20, 2013

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

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

3.9 221 km SSE of Atka, Alaska 08:55 UTC
2.5 201 km SSE of Atka, Alaska 17:52 UTC
4.0 209 km SSE of Atka, Alaska 17:37 UTC
3.4 204 km SSE of Atka, Alaska 19:38 UTC
2.7 203 km SSE of Atka, Alaska 09:15 UTC
2.1 185 km SSE of Atka, Alaska 21:35 UTC
3.3 217 km SSE of Atka, Alaska 14:53 UTC
2.2 194 km SSE of Atka, Alaska 06:24 UTC
3.5 198 km SSE of Atka, Alaska 21:33 UTC
2.7 208 km SSE of Atka, Alaska 15:08 UTC
3.2 211 km SSE of Atka, Alaska 16:54 UTC
3.8 193 km SSE of Atka, Alaska 18:37 UTC
3.1 209 km SSE of Atka, Alaska 22:32 UTC
3.2 186 km SSE of Atka, Alaska 06:45 UTC
2.6 196 km SSE of Atka, Alaska 11:24 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:28 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.