32 km NNW 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 11 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 16,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 710× the energy of this one
3. Magna, Utah 2020 M 5.7 500× the energy of this one
4. This earthquake M 3.9 about 11 tons of TNT
5. Around the size people start to feel M 3.0 this one released 22× 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 55.1356, -163.5193. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 2.0 23 km E of False Pass, Alaska 16:05 UTC
2. 2.4 13 km SSW of False Pass, Alaska 04:20 UTC
3. 1.8 12 km SW of False Pass, Alaska 03:27 UTC
4. 1.5 13 km SW of False Pass, Alaska 12:39 UTC
5. 1.7 Unimak Island region, Alaska 02:39 UTC
6. 1.9 13 km SW of False Pass, Alaska 20:20 UTC
7. 2.1 28 km SW of Cold Bay, Alaska 03:47 UTC
8. 1.6 15 km SSW of False Pass, Alaska 05:19 UTC
9. 2.5 4 km S of False Pass, Alaska 11:17 UTC
10. 2.4 32 km W of False Pass, Alaska 18:14 UTC
11. 3.1 15 km N of False Pass, Alaska 05:27 UTC
12. 2.5 35 km N of False Pass, Alaska 13:37 UTC
13. 1.9 13 km S of False Pass, Alaska 05:19 UTC
14. 2.2 23 km NNE of False Pass, Alaska 06:45 UTC
15. 1.7 13 km SW of False Pass, Alaska 11:13 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 22:10 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 4.6 on 2018-07-02 — it released about 11 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.