85 km SE of Sand Point, Alaska

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 60 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.4 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 2,800× the energy of this one
2. Mineral, Virginia 2011 M 5.8 130× the energy of this one
3. Magna, Utah 2020 M 5.7 89× the energy of this one
4. This earthquake M 4.4 about 60 tons of TNT
5. Around the size people start to feel M 3.0 this one released 130× 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 54.7393, -159.6650. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.2 109 km SSE of Sand Point, Alaska 20:47 UTC
2. 1.8 83 km SE of Sand Point, Alaska 20:29 UTC
3. 2.7 75 km ESE of Sand Point, Alaska 18:05 UTC
4. 2.8 97 km SE of Sand Point, Alaska 17:50 UTC
5. 1.7 86 km SSE of Sand Point, Alaska 17:15 UTC
6. 2.6 92 km SSE of Sand Point, Alaska 17:06 UTC
7. 1.8 95 km SSE of Sand Point, Alaska 16:02 UTC
8. 1.6 91 km SSE of Sand Point, Alaska 15:14 UTC
9. 1.6 103 km SSE of Sand Point, Alaska 15:10 UTC
10. 1.8 91 km SSE of Sand Point, Alaska 15:09 UTC
11. 1.6 79 km ESE of Sand Point, Alaska 14:42 UTC
12. 2.1 80 km ESE of Sand Point, Alaska 13:56 UTC
13. 1.9 101 km SSE of Sand Point, Alaska 13:42 UTC
14. 1.9 118 km SSE of Sand Point, Alaska 12:39 UTC
15. 2.1 106 km SSE of Sand Point, Alaska 10:20 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:56 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 7.6 on 2020-10-19 — it released about 63,000 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.