150 km S of Sand Point, 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 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 250,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
4. This earthquake M 3.1 about 1,300 lb of TNT
5. Around the size people start to feel M 3.0 this one released 1.4× 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 53.9886, -160.5573. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.6 132 km S of Sand Point, Alaska 02:07 UTC
2. 2.4 113 km S of Sand Point, Alaska 01:24 UTC
3. 2.4 104 km S of Sand Point, Alaska 23:10 UTC
4. 1.8 122 km SSW of Sand Point, Alaska 06:45 UTC
5. 2.6 149 km SE of King Cove, Alaska 06:53 UTC
6. 2.6 123 km SSW of Sand Point, Alaska 02:27 UTC
7. 2.1 104 km S of Sand Point, Alaska 23:41 UTC
8. 2.2 122 km SSW of Sand Point, Alaska 13:03 UTC
9. 2.5 127 km S of Sand Point, Alaska 00:25 UTC
10. 2.7 117 km S of Sand Point, Alaska 15:38 UTC
11. 2.7 133 km S of Sand Point, Alaska 14:56 UTC
12. 2.2 146 km S of Sand Point, Alaska 14:33 UTC
13. 1.9 130 km S of Sand Point, Alaska 11:38 UTC
14. 2.2 128 km S of Sand Point, Alaska 11:35 UTC
15. 2.6 172 km SSE of King Cove, Alaska 05:09 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 22:49 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 7.2 on 2023-07-16 — it released about 1,400,000 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.