129 km WSW of Nikolski, Alaska

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

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.

Where

Epicentre 52.4838, -170.6317. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.8 130 km SW of Nikolski, Alaska 10:03 UTC
2. 3.1 139 km WSW of Nikolski, Alaska 19:25 UTC
3. 3.8 120 km W of Nikolski, Alaska 03:16 UTC
4. 3.8 103 km W of Nikolski, Alaska 19:02 UTC
5. 2.3 115 km SW of Nikolski, Alaska 22:17 UTC
6. 3.6 149 km W of Nikolski, Alaska 16:40 UTC
7. 3.4 131 km WSW of Nikolski, Alaska 13:44 UTC
8. 2.7 151 km WSW of Nikolski, Alaska 22:53 UTC
9. 3.9 173 km WSW of Nikolski, Alaska 20:13 UTC
10. 2.8 159 km WSW of Nikolski, Alaska 17:12 UTC
11. 3.4 126 km SW of Nikolski, Alaska 08:39 UTC
12. 2.1 116 km WSW of Nikolski, Alaska 01:35 UTC
13. 3.2 171 km WSW of Nikolski, Alaska 06:03 UTC
14. 3.5 126 km SW of Nikolski, Alaska 12:47 UTC
15. 3.8 125 km SW of Nikolski, Alaska 15:06 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 15:13 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 6.0 on 2024-07-19 — it released about 32 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

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.