232 km SSE of King Cove, 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 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 53.0234, -161.5252. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.2 228 km SSE of False Pass, Alaska 20:37 UTC
2. 2.6 244 km SSE of False Pass, Alaska 19:41 UTC
3. 2.5 240 km SSE of False Pass, Alaska 15:31 UTC
4. 2.6 207 km S of King Cove, Alaska 16:20 UTC
5. 2.8 249 km SSE of False Pass, Alaska 14:48 UTC
6. 2.2 208 km SSE of King Cove, Alaska 22:37 UTC
7. 2.3 231 km S of King Cove, Alaska 15:02 UTC
8. 2.8 225 km SSE of King Cove, Alaska 21:46 UTC
9. 2.8 224 km SSE of False Pass, Alaska 22:13 UTC
10. 2.2 203 km SSE of King Cove, Alaska 22:19 UTC
11. 2.8 212 km S of King Cove, Alaska 05:32 UTC
12. 3.1 201 km SSE of King Cove, Alaska 19:48 UTC
13. 2.8 197 km S of King Cove, Alaska 01:14 UTC
14. 2.8 200 km SSE of King Cove, Alaska 23:38 UTC
15. 3.0 230 km S of King Cove, Alaska 09:00 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 17:10 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 4.2 on 2017-03-15.

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.