84 km SE of Nikolski, Alaska

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 8 km (5 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 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
3. Around the size people start to feel M 3.0 16× the energy of this one
4. This earthquake M 2.2 about 60 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 6.8 on 2022-01-11 — about 7,900,000 times the energy of this one.

Before 2016, the USGS record lists 130 earthquakes of M5 or more within 50 km; the five largest:

1. 7.0 Fox Islands, Aleutian Islands, Alaska · 47 km E of this epicentre Jan 1, 1902
2. 6.7 103 km SE of Nikolski, Alaska · 36 km ENE of this epicentre Feb 20, 1916
3. 6.7 75 km SSE of Nikolski, Alaska · 17 km W of this epicentre Jan 2, 1957
4. 6.7 72 km ESE of Nikolski, Alaska · 43 km NNE of this epicentre Jan 2, 1957
5. 6.6 61 km SE of Nikolski, Alaska · 31 km N of this epicentre Jan 2, 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

Epicentre 52.3171, -168.1401. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.3 107 km SE of Nikolski, Alaska 03:51 UTC
2. 2.0 61 km ESE of Nikolski, Alaska 12:08 UTC
3. 2.0 55 km SE of Nikolski, Alaska 13:11 UTC
4. 3.3 68 km ESE of Nikolski, Alaska 09:40 UTC
5. 2.7 68 km ESE of Nikolski, Alaska 14:46 UTC
6. 2.9 Fox Islands, Aleutian Islands, Alaska 11:43 UTC
7. 1.9 97 km SE of Nikolski, Alaska 20:54 UTC
8. 1.7 91 km ESE of Nikolski, Alaska 20:29 UTC
9. 3.0 44 km ESE of Nikolski, Alaska 20:55 UTC
10. 2.5 Fox Islands, Aleutian Islands, Alaska 00:58 UTC
11. 2.4 71 km ESE of Nikolski, Alaska 08:29 UTC
12. 4.1 75 km SE of Nikolski, Alaska 01:43 UTC
13. 2.3 44 km SE of Nikolski, Alaska 11:47 UTC
14. 2.4 35 km SSE of Nikolski, Alaska 23:26 UTC
15. 2.9 90 km SE of Nikolski, Alaska 05:48 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 09:51 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.