130 km WSW of Nikolski, Alaska

Yes. A magnitude 4.9 earthquake was recorded 130 km WSW of Nikolski, Alaska at 08:16 UTC on 2018-03-04, 55 km deep.

2018-03-04 08:16 UTC · 55 km deep · released about 340 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: 2018-03-04 08:16 UTC
Magnitude: M 4.9 (mb)
Depth: 55 km below the surface
Felt: no reports yet
Status: Reviewed by a seismologist

USGS · last changed by USGS 1191 days ago · we first saw it 1191 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 173 km (107 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 340 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.9 would have released about 32 times as much.

Northridge, California 1994 M 6.7 500× the energy of this one
Mineral, Virginia 2011 M 5.8 22× the energy of this one
Magna, Utah 2020 M 5.7 16× the energy of this one
This earthquake M 4.9 about 340 tons of TNT
Around the size people start to feel M 3.0 this one released 710× 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 2.8 times the energy of this one.

Before 2016, the USGS record lists 45 earthquakes of M5 or more within 50 km; the five largest:

6.0 177 km WSW of Nikolski, Alaska · 47 km WSW of this epicentre Aug 19, 1925
6.0 128 km SW of Nikolski, Alaska · 41 km SE of this epicentre Jun 1, 1945
6.0 164 km WSW of Nikolski, Alaska · 36 km W of this epicentre Mar 18, 1957
6.0 161 km WSW of Nikolski, Alaska · 32 km SW of this epicentre May 10, 1962
6.0 177 km WSW of Nikolski, Alaska · 49 km SW of this epicentre Nov 15, 1988

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

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

3.1 125 km WSW of Nikolski, Alaska 09:47 UTC
2.8 161 km SW of Nikolski, Alaska 08:26 UTC
4.5 96 km WSW of Nikolski, Alaska 08:43 UTC
2.9 117 km SW of Nikolski, Alaska 09:48 UTC
3.4 118 km SW of Nikolski, Alaska 00:17 UTC
2.9 162 km SW of Nikolski, Alaska 21:31 UTC
4.0 140 km SW of Nikolski, Alaska 18:22 UTC
3.8 116 km SW of Nikolski, Alaska 15:44 UTC
2.8 129 km SW of Nikolski, Alaska 22:29 UTC
2.1 156 km WSW of Nikolski, Alaska 18:03 UTC
2.3 129 km SW of Nikolski, Alaska 01:05 UTC
2.1 115 km SW of Nikolski, Alaska 12:19 UTC
2.5 92 km WSW of Nikolski, Alaska 14:44 UTC
2.5 Fox Islands, Aleutian Islands, Alaska 04:25 UTC
3.2 151 km WSW of Nikolski, Alaska 15:18 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:10 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.