207 km W of Adak, Alaska

Yes. A magnitude 2.1 earthquake was recorded 207 km W of Adak, Alaska at 00:29 UTC on 2019-12-07, 13 km deep.

2019-12-07 00:29 UTC · 13 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: 2019-12-07 00:29 UTC
Magnitude: M 2.1 (ml)
Depth: 13 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 2527 days ago · we first saw it 2527 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 11 km (7 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 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 5.2 on 2016-11-23 — about 45,000 times the energy of this one.

Before 2016, the USGS record lists 87 earthquakes of M5 or more within 50 km; the five largest:

7.2 207 km WSW of Adak, Alaska · 33 km SSE of this epicentre Dec 19, 2007
6.9 203 km WSW of Adak, Alaska · 35 km SSE of this epicentre Mar 31, 1913
6.9 231 km WSW of Adak, Alaska · 42 km SSW of this epicentre May 14, 1969
6.8 235 km WSW of Adak, Alaska · 46 km SSW of this epicentre May 6, 1987
6.7 237 km WSW of Adak, Alaska · 40 km SW of this epicentre Oct 13, 1926

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

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

4.3 211 km W of Adak, Alaska 22:53 UTC
2.6 195 km WSW of Adak, Alaska 06:21 UTC
2.6 218 km W of Adak, Alaska 02:46 UTC
2.0 231 km W of Adak, Alaska 00:18 UTC
1.9 206 km W of Adak, Alaska 23:13 UTC
1.7 195 km W of Adak, Alaska 04:51 UTC
2.0 233 km WSW of Adak, Alaska 05:10 UTC
2.9 183 km WSW of Adak, Alaska 03:55 UTC
2.9 241 km WSW of Adak, Alaska 06:41 UTC
2.6 229 km W of Adak, Alaska 14:45 UTC
1.9 194 km W of Adak, Alaska 01:15 UTC
1.7 195 km WSW of Adak, Alaska 20:13 UTC
1.6 192 km WSW of Adak, Alaska 19:52 UTC
1.6 219 km WSW of Adak, Alaska 15:49 UTC
1.9 198 km WSW of Adak, Alaska 23:17 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 09:17 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.