189 km SE of Perryville, Alaska

Yes. A magnitude 3.3 earthquake was recorded 189 km SE of Perryville, Alaska at 00:17 UTC on 2021-10-10, 10 km deep.

2021-10-10 00:17 UTC · 10 km deep · released about 1.3 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: 2021-10-10 00:17 UTC
Magnitude: M 3.3 (ml)
Depth: 10 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1791 days ago · we first saw it 1791 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 51 km (32 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 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

Northridge, California 1994 M 6.7 130,000× the energy of this one
Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
Magna, Utah 2020 M 5.7 4,000× the energy of this one
This earthquake M 3.3 about 1.3 tons of TNT
Around the size people start to feel M 3.0 this one released 2.8× 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 4.5 on 2021-07-29 — about 63 times the energy of this one.

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

6.2 143 km SE of Perryville, Alaska · 46 km NW of this epicentre Mar 25, 1927
5.9 182 km SE of Perryville, Alaska · 9 km N of this epicentre Dec 23, 1938
5.5 160 km SE of Perryville, Alaska · 39 km N of this epicentre Mar 10, 2012
5.0 213 km SE of Perryville, Alaska · 42 km E of this epicentre Jan 7, 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

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

4.0 189 km SE of Perryville, Alaska 19:15 UTC
2.7 208 km SE of Perryville, Alaska 12:25 UTC
2.3 176 km SE of Perryville, Alaska 23:31 UTC
2.6 198 km SE of Perryville, Alaska 22:06 UTC
2.6 170 km SE of Perryville, Alaska 08:15 UTC
2.6 196 km SE of Perryville, Alaska 00:36 UTC
2.0 147 km SE of Perryville, Alaska 20:14 UTC
2.8 205 km SE of Perryville, Alaska 11:07 UTC
2.3 201 km SE of Perryville, Alaska 19:18 UTC
3.4 209 km SE of Perryville, Alaska 12:46 UTC
3.4 219 km SE of Perryville, Alaska 12:45 UTC
2.7 207 km SE of Perryville, Alaska 17:05 UTC
2.5 186 km SE of Perryville, Alaska 15:49 UTC
3.0 207 km SE of Perryville, Alaska 13:46 UTC
4.5 147 km SE of Perryville, Alaska 18:08 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 16:52 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.