194 km SSW of Adak, Alaska

Yes. A magnitude 3.0 earthquake was recorded 194 km SSW of Adak, Alaska at 10:03 UTC on 2020-10-22, 36 km deep.

2020-10-22 10:03 UTC · 36 km deep · released about 950 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: 2020-10-22 10:03 UTC
Magnitude: M 3.0 (ml)
Depth: 36 km below the surface
Felt: no reports yet
Nearest mapped fault: Alaska-Aleutian subduction zone, 4 km from its surface trace — near is not the same as on
Status: Reviewed by a seismologist

USGS · last changed by USGS 2135 days ago · we first saw it 2135 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 9 km (6 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 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

Northridge, California 1994 M 6.7 350,000× the energy of this one
Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
Magna, Utah 2020 M 5.7 11,000× the energy of this one
This earthquake M 3.0 about 950 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 2018-08-10 — about 500 times the energy of this one.

Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:

6.5 184 km SSW of Adak, Alaska · 44 km ESE of this epicentre Aug 15, 2007
6.0 207 km SW of Adak, Alaska · 36 km WNW of this epicentre Feb 7, 1926
6.0 161 km SSW of Adak, Alaska · 45 km ENE of this epicentre Jan 11, 1934
5.8 150 km SW of Adak, Alaska · 45 km NNE of this epicentre Jul 7, 1929
5.8 192 km SSW of Adak, Alaska · 45 km ESE of this epicentre Aug 16, 2007

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

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

2.5 187 km SW of Adak, Alaska 11:32 UTC
2.6 220 km SSW of Adak, Alaska 16:46 UTC
3.2 181 km SSW of Adak, Alaska 17:17 UTC
2.3 220 km SSW of Adak, Alaska 22:28 UTC
2.3 195 km SW of Adak, Alaska 01:34 UTC
2.8 220 km SSW of Adak, Alaska 03:31 UTC
2.8 170 km SW of Adak, Alaska 07:49 UTC
3.5 240 km SSW of Adak, Alaska 00:51 UTC
2.5 158 km SW of Adak, Alaska 05:41 UTC
2.8 210 km SSW of Adak, Alaska 20:10 UTC
2.4 222 km SSW of Adak, Alaska 05:03 UTC
2.4 180 km SW of Adak, Alaska 03:56 UTC
1.9 190 km SW of Adak, Alaska 16:00 UTC
2.1 195 km SSW of Adak, Alaska 08:55 UTC
1.7 Andreanof Islands, Aleutian Islands, Alaska 17:19 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 08:28 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.