76 km WSW of Karluk, Alaska

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. 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 1.9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 89,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 4,000× the energy of this one
3. Magna, Utah 2020 M 5.7 2,800× the energy of this one
4. This earthquake M 3.4 about 1.9 tons of TNT
5. Around the size people start to feel M 3.0 this one released 4× 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 5.3 on 2021-02-13 — about 710 times the energy of this one.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

1. 5.5 64 km SW of Karluk, Alaska · 18 km ESE of this epicentre Nov 11, 1968
2. 5.3 50 km WNW of Akhiok, Alaska · 41 km ESE of this epicentre Sep 12, 1992
3. 5.2 55 km WSW of Karluk, Alaska · 23 km NE of this epicentre May 9, 1990
4. 5.2 53 km WNW of Akhiok, Alaska · 39 km ESE of this epicentre Jul 19, 2006
5. 5.0 42 km WNW of Akhiok, Alaska · 50 km ESE of this epicentre Aug 1, 1992

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 57.2450, -155.5850. Map © OpenStreetMap contributors.

Nearby places

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

1. 1.5 88 km E of Ugashik, Alaska 14:55 UTC
2. 2.1 72 km WSW of Karluk, Alaska 13:24 UTC
3. 2.1 51 km WSW of Karluk, Alaska 13:50 UTC
4. 1.5 71 km WSW of Karluk, Alaska 06:03 UTC
5. 1.5 86 km W of Karluk, Alaska 10:52 UTC
6. 2.7 93 km ESE of Ugashik, Alaska 19:42 UTC
7. 2.0 62 km WSW of Karluk, Alaska 05:09 UTC
8. 2.5 77 km W of Akhiok, Alaska 00:57 UTC
9. 2.3 57 km WNW of Akhiok, Alaska 14:43 UTC
10. 2.2 46 km WSW of Karluk, Alaska 18:44 UTC
11. 3.4 88 km W of Akhiok, Alaska 00:27 UTC
12. 2.1 75 km SW of Karluk, Alaska 01:09 UTC
13. 2.4 84 km W of Akhiok, Alaska 23:55 UTC
14. 2.0 64 km W of Akhiok, Alaska 10:52 UTC
15. 2.4 57 km WNW of Akhiok, Alaska 12:50 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 05:12 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

Revisions

USGS refines a solution as more stations report. Every change we have seen is listed here.

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.