212 km SSW of Adak, Alaska

Yes. A magnitude 2.1 earthquake was recorded 212 km SSW of Adak, Alaska at 08:33 UTC on 2019-10-05, 37 km deep.

2019-10-05 08:33 UTC · 37 km deep · released about 43 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: 2019-10-05 08:33 UTC
Magnitude: M 2.1 (ml)
Depth: 37 km below the surface
Felt: no reports yet
Nearest mapped fault: Alaska-Aleutian subduction zone, 11 km from its surface trace — near is not the same as on
Status: Reviewed by a seismologist

USGS · last changed by USGS 2576 days ago · we first saw it 2576 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 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
Magna, Utah 2020 M 5.7 250,000× the energy of this one
Around the size people start to feel M 3.0 22× the energy of this one
This earthquake M 2.1 about 43 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 11,000 times the energy of this one.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

6.8 Andreanof Islands, Aleutian Islands, Alaska · 41 km WSW of this epicentre Jun 22, 1913
6.0 207 km SW of Adak, Alaska · 35 km NW of this epicentre Feb 7, 1926
6.0 254 km SW of Adak, Alaska · 46 km WSW of this epicentre Jul 8, 1929
5.7 167 km SSW of Adak, Alaska · 46 km NE of this epicentre Aug 13, 1958

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

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

2.8 170 km SW of Adak, Alaska 07:49 UTC
3.5 240 km SSW of Adak, Alaska 00:51 UTC
2.8 210 km SSW of Adak, Alaska 20:10 UTC
2.4 231 km SSW of Adak, Alaska 08:52 UTC
2.4 222 km SSW of Adak, Alaska 05:03 UTC
2.4 180 km SW of Adak, Alaska 03:56 UTC
3.0 244 km SW of Adak, Alaska 03:15 UTC
1.9 190 km SW of Adak, Alaska 16:00 UTC
2.4 244 km SSW of Adak, Alaska 21:41 UTC
2.1 195 km SSW of Adak, Alaska 08:55 UTC
2.5 241 km SSW of Adak, Alaska 21:22 UTC
2.2 207 km SSW of Adak, Alaska 05:26 UTC
2.1 Andreanof Islands, Aleutian Islands, Alaska 14:25 UTC
3.3 255 km SSW of Adak, Alaska 22:54 UTC
3.7 Andreanof Islands, Aleutian Islands, Alaska 04:33 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:58 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.