164 km SW of Nikolski, Alaska

Yes. A magnitude 3.2 earthquake was recorded 164 km SW of Nikolski, Alaska at 00:02 UTC on 2018-06-21, 37 km deep.

2018-06-21 00:02 UTC · 37 km deep · released about 1,900 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: 2018-06-21 00:02 UTC
Magnitude: M 3.2 (ml)
Depth: 37 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1187 days ago · we first saw it 1187 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 29 km (18 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 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

Northridge, California 1994 M 6.7 180,000× the energy of this one
Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
Magna, Utah 2020 M 5.7 5,600× the energy of this one
This earthquake M 3.2 about 1,900 lb of TNT
Around the size people start to feel M 3.0 this one released 2× 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 5.2 on 2017-05-19 — about 1,000 times the energy of this one.

Before 2016, the USGS record lists 46 earthquakes of M5 or more within 50 km; the five largest:

6.6 135 km SW of Nikolski, Alaska · 30 km NNE of this epicentre Dec 23, 1906
6.2 179 km SW of Nikolski, Alaska · 28 km W of this epicentre Jun 4, 1956
6.2 Fox Islands, Aleutian Islands, Alaska · 32 km WSW of this epicentre Mar 10, 1957
6.1 Fox Islands, Aleutian Islands, Alaska · 39 km W of this epicentre Jan 11, 1961
6.0 119 km SSW of Nikolski, Alaska · 47 km NE of this epicentre Mar 29, 1931

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

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

4.0 158 km SW of Nikolski, Alaska 22:59 UTC
4.1 118 km SSW of Nikolski, Alaska 08:17 UTC
2.9 170 km SW of Nikolski, Alaska 14:40 UTC
3.0 129 km SSW of Nikolski, Alaska 02:38 UTC
2.8 207 km SW of Nikolski, Alaska 08:24 UTC
3.5 137 km SW of Nikolski, Alaska 21:01 UTC
3.0 209 km SSW of Nikolski, Alaska 00:46 UTC
3.7 180 km SW of Nikolski, Alaska 07:44 UTC
3.8 149 km SW of Nikolski, Alaska 04:27 UTC
4.1 208 km SW of Nikolski, Alaska 18:52 UTC
3.6 185 km SW of Nikolski, Alaska 18:22 UTC
3.6 175 km SW of Nikolski, Alaska 17:24 UTC
3.9 195 km SW of Nikolski, Alaska 18:17 UTC
3.6 154 km SSW of Nikolski, Alaska 18:09 UTC
3.1 192 km SW of Nikolski, Alaska 14:43 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 15:10 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.