59 km N of Karluk, Alaska

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre.

At this magnitude and depth, people at rest would likely notice it out to about 174 km (108 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 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.0 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 350× the energy of this one
2. Mineral, Virginia 2011 M 5.8 16× the energy of this one
3. Magna, Utah 2020 M 5.7 11× the energy of this one
4. This earthquake M 5.0 about 480 tons of TNT
5. Around the size people start to feel M 3.0 this one released 1,000× 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 (31 mi) since our catalogue begins in 2016. The previous largest was M 4.4 on 2021-06-28.

Before 2016, the USGS record lists 53 earthquakes of M5 or more within 50 km; the five largest:

1. 7.0 Event 36 Novarupta-Mount Katmai area, Alaska Peninsula · 32 km NW of this epicentre Jun 8, 1912
2. 6.8 Event 37 Novarupta-Mount Katmai area, Alaska Peninsula · 32 km NW of this epicentre Jun 8, 1912
3. 6.8 Event 48 Novarupta-Mount Katmai area, Alaska Peninsula · 39 km WNW of this epicentre Jun 10, 1912
4. 6.6 Event 39 Novarupta-Mount Katmai area, Alaska Peninsula · 32 km NW of this epicentre Jun 8, 1912
5. 6.5 Event 21 Novarupta-Mount Katmai area, Alaska Peninsula · 32 km NW of this epicentre Jun 7, 1912

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 58.1016, -154.6028. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.6 49 km NW of Karluk, Alaska 06:03 UTC
2. 1.7 25 km NE of Karluk, Alaska 01:03 UTC
3. 1.8 83 km NNW of Karluk, Alaska 11:22 UTC
4. 1.9 85 km NNW of Karluk, Alaska 03:08 UTC
5. 2.0 10 km N of Karluk, Alaska 01:38 UTC
6. 1.8 81 km NNW of Karluk, Alaska 21:03 UTC
7. 1.8 13 km NNW of Karluk, Alaska 12:47 UTC
8. 1.6 80 km NNW of Karluk, Alaska 12:52 UTC
9. 1.5 85 km NNW of Karluk, Alaska 04:47 UTC
10. 1.8 Alaska Peninsula 23:37 UTC
11. 1.8 Alaska Peninsula 16:41 UTC
12. 2.0 76 km WNW of Aleneva, Alaska 10:01 UTC
13. 2.2 68 km N of Larsen Bay, Alaska 05:57 UTC
14. 2.1 88 km NNW of Karluk, Alaska 04:49 UTC
15. 1.9 43 km N of Karluk, Alaska 22:59 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 04:09 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.