242 km S of False Pass, Alaska

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

How big was it?

This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 130,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
4. This earthquake M 3.3 about 1.3 tons of TNT
5. Around the size people start to feel M 3.0 this one released 2.8× 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 52.6906, -163.0267. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 5.0 244 km SSE of False Pass, Alaska 21:06 UTC
2. 3.2 228 km S of False Pass, Alaska 05:17 UTC
3. 2.7 209 km SE of Akutan, Alaska 16:56 UTC
4. 2.8 199 km S of False Pass, Alaska 19:17 UTC
5. 3.0 210 km S of False Pass, Alaska 23:55 UTC
6. 3.0 269 km S of False Pass, Alaska 03:34 UTC
7. 2.5 221 km S of False Pass, Alaska 14:10 UTC
8. 2.7 219 km SE of Akutan, Alaska 16:14 UTC
9. 2.6 215 km SE of Akutan, Alaska 08:36 UTC
10. 2.9 233 km S of False Pass, Alaska 03:34 UTC
11. 3.2 239 km S of False Pass, Alaska 07:06 UTC
12. 2.8 221 km S of False Pass, Alaska 11:03 UTC
13. 2.9 201 km S of False Pass, Alaska 17:40 UTC
14. 3.8 205 km S of False Pass, Alaska 19:12 UTC
15. 4.0 201 km S of False Pass, Alaska 19:12 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 12:56 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 5.3 on 2024-10-16 — it released about 1,000 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.