148 km SW of Nikolski, Alaska

Yes. A magnitude 2.8 earthquake was recorded 148 km SW of Nikolski, Alaska at 08:59 UTC on 2017-05-29, 10 km deep.

2017-05-29 08:59 UTC · 10 km deep · released about 480 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: 2017-05-29 08:59 UTC
Magnitude: M 2.8 (ml)
Depth: 10 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1194 days ago · we first saw it 1194 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 25 km (16 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 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
Magna, Utah 2020 M 5.7 22,000× the energy of this one
Around the size people start to feel M 3.0 2× the energy of this one
This earthquake M 2.8 about 480 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 2017-05-19 — about 4,000 times the energy of this one.

Before 2016, the USGS record lists 77 earthquakes of M5 or more within 50 km; the five largest:

6.6 135 km SW of Nikolski, Alaska · 33 km ESE of this epicentre Dec 23, 1906
6.2 179 km SW of Nikolski, Alaska · 36 km SSW of this epicentre Jun 4, 1956
6.1 Fox Islands, Aleutian Islands, Alaska · 38 km SSW of this epicentre Jan 11, 1961
6.0 128 km SW of Nikolski, Alaska · 22 km ENE of this epicentre Jun 1, 1945
6.0 164 km WSW of Nikolski, Alaska · 49 km NW of this epicentre Mar 18, 1957

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

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

3.0 120 km WSW of Nikolski, Alaska 20:06 UTC
3.4 130 km SW of Nikolski, Alaska 23:36 UTC
4.3 139 km SW of Nikolski, Alaska 02:22 UTC
3.2 178 km SW of Nikolski, Alaska 23:06 UTC
4.3 157 km SW of Nikolski, Alaska 02:28 UTC
4.1 108 km SW of Nikolski, Alaska 03:45 UTC
4.1 179 km SW of Nikolski, Alaska 05:22 UTC
4.5 158 km SW of Nikolski, Alaska 03:33 UTC
3.7 174 km SW of Nikolski, Alaska 08:20 UTC
4.7 156 km SW of Nikolski, Alaska 06:07 UTC
3.3 112 km SW of Nikolski, Alaska 14:30 UTC
4.6 166 km WSW of Nikolski, Alaska 11:50 UTC
3.2 154 km SW of Nikolski, Alaska 08:31 UTC
2.5 172 km WSW of Nikolski, Alaska 18:48 UTC
2.7 177 km SW of Nikolski, Alaska 06:53 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 21:13 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.