230 km SSW of Adak, Alaska

Yes. A magnitude 4.6 earthquake was recorded 230 km SSW of Adak, Alaska at 18:34 UTC on 2020-01-30, 10 km deep.

2020-01-30 18:34 UTC · 10 km deep · released about 120 tons 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: 2020-01-30 18:34 UTC
Magnitude: M 4.6 (mb)
Depth: 10 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 2400 days ago · we first saw it 2400 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

At this magnitude and depth, people at rest would likely notice it out to about 149 km (93 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 120 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.6 would have released about 32 times as much.

Northridge, California 1994 M 6.7 1,400× the energy of this one
Mineral, Virginia 2011 M 5.8 63× the energy of this one
Magna, Utah 2020 M 5.7 45× the energy of this one
This earthquake M 4.6 about 120 tons of TNT
Around the size people start to feel M 3.0 this one released 250× more

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 2 times the energy of this one.

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

6.5 184 km SSW of Adak, Alaska · 47 km NNE of this epicentre Aug 15, 2007
6.0 194 km SSW of Adak, Alaska · 41 km NE of this epicentre Nov 11, 1993
5.8 192 km SSW of Adak, Alaska · 38 km NE of this epicentre Aug 16, 2007
5.1 190 km SSW of Adak, Alaska · 41 km NE of this epicentre Sep 19, 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

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

2.7 220 km SSW of Adak, Alaska 14:46 UTC
2.4 249 km SSW of Adak, Alaska 06:49 UTC
2.8 204 km SSW of Adak, Alaska 08:34 UTC
2.9 246 km SSW of Adak, Alaska 15:12 UTC
2.7 184 km SSW of Adak, Alaska 23:02 UTC
2.1 190 km SSW of Adak, Alaska 07:23 UTC
2.8 244 km SSW of Adak, Alaska 23:58 UTC
2.6 220 km SSW of Adak, Alaska 16:46 UTC
2.3 220 km SSW of Adak, Alaska 22:28 UTC
4.0 250 km SSW of Adak, Alaska 13:46 UTC
2.8 240 km SSW of Adak, Alaska 02:06 UTC
2.6 237 km SSW of Adak, Alaska 16:50 UTC
2.3 243 km SSW of Adak, Alaska 15:56 UTC
2.8 220 km SSW of Adak, Alaska 03:31 UTC
2.7 257 km SSW of Adak, Alaska 18:45 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 05:37 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.