113 km ESE 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. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 30 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 5,600× the energy of this one
2. Mineral, Virginia 2011 M 5.8 250× the energy of this one
3. Magna, Utah 2020 M 5.7 180× the energy of this one
4. This earthquake M 4.2 about 30 tons of TNT
5. Around the size people start to feel M 3.0 this one released 63× 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 54.8808, -158.9014. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.7 132 km SSE of Perryville, Alaska 00:32 UTC
2. 2.6 101 km SSE of Perryville, Alaska 00:17 UTC
3. 2.2 96 km SSE of Perryville, Alaska 00:06 UTC
4. 1.8 74 km ESE of Sand Point, Alaska 23:55 UTC
5. 2.2 120 km ESE of Sand Point, Alaska 23:48 UTC
6. 2.1 92 km SSE of Perryville, Alaska 22:04 UTC
7. 5.5 73 km S of Ivanof Bay, Alaska 21:39 UTC
8. 2.2 123 km SSE of Perryville, Alaska 19:52 UTC
9. 4.0 94 km SSE of Perryville, Alaska 19:37 UTC
10. 2.1 100 km SSE of Perryville, Alaska 18:33 UTC
11. 2.2 80 km ESE of Sand Point, Alaska 17:19 UTC
12. 2.0 74 km S of Perryville, Alaska 17:07 UTC
13. 2.5 138 km SSE of Perryville, Alaska 16:52 UTC
14. 2.0 77 km S of Perryville, Alaska 16:37 UTC
15. 3.2 89 km SSE of Perryville, Alaska 15:37 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 15:41 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 7.8 on 2020-07-22 — it released about 250,000 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.