116 km SSW of Adak, Alaska

Yes. A magnitude 2.2 earthquake was recorded 116 km SSW of Adak, Alaska at 08:40 UTC on 2024-12-09, 4.9 km deep.

2024-12-09 08:40 UTC · 4.9 km deep · released about 60 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: 2024-12-09 08:40 UTC
Magnitude: M 2.2 (ml)
Depth: 4.9 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 700 days ago · we first saw it 700 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 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
Magna, Utah 2020 M 5.7 180,000× the energy of this one
Around the size people start to feel M 3.0 16× the energy of this one
This earthquake M 2.2 about 60 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 6.3 on 2024-12-09 — about 1,400,000 times the energy of this one.

Before 2016, the USGS record lists 57 earthquakes of M5 or more within 50 km; the five largest:

6.8 90 km SSW of Adak, Alaska · 32 km NE of this epicentre Mar 11, 1957
6.6 85 km SSW of Adak, Alaska · 36 km NE of this epicentre Jul 5, 1929
6.4 76 km SSW of Adak, Alaska · 41 km NNE of this epicentre Jul 23, 1957
6.2 101 km SW of Adak, Alaska · 46 km NW of this epicentre Jun 2, 1940
6.0 130 km SSW of Adak, Alaska · 14 km SW of this epicentre Mar 20, 1927

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

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

3.2 124 km SSW of Adak, Alaska 18:46 UTC
2.1 111 km SSW of Adak, Alaska 17:58 UTC
3.4 120 km SSW of Adak, Alaska 17:54 UTC
2.1 107 km SSW of Adak, Alaska 17:53 UTC
2.1 114 km SSW of Adak, Alaska 17:40 UTC
2.2 127 km SSW of Adak, Alaska 17:24 UTC
3.7 124 km SSW of Adak, Alaska 17:16 UTC
2.1 109 km SSW of Adak, Alaska 17:08 UTC
2.0 88 km SSW of Adak, Alaska 17:07 UTC
3.4 140 km SSW of Adak, Alaska 17:03 UTC
2.8 118 km SSW of Adak, Alaska 16:58 UTC
2.5 125 km SSW of Adak, Alaska 16:55 UTC
3.4 125 km SSW of Adak, Alaska 16:51 UTC
5.3 115 km SSW of Adak, Alaska 16:48 UTC
2.6 125 km SSW of Adak, Alaska 16:41 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 04:03 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.