210 km SSE of King Cove, 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 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 130,000× the energy of this one
2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
4. This earthquake M 3.3 about 1.3 tons of TNT
5. Around the size people start to feel M 3.0 this one released 2.8× 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 53.2709, -161.2821. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.2 211 km S of King Cove, Alaska 15:05 UTC
2. 3.1 217 km S of King Cove, Alaska 14:51 UTC
3. 3.1 219 km S of King Cove, Alaska 00:35 UTC
4. 4.4 185 km S of King Cove, Alaska 15:50 UTC
5. 2.7 201 km SSE of King Cove, Alaska 02:38 UTC
6. 2.7 190 km SSE of King Cove, Alaska 06:07 UTC
7. 3.2 216 km SSE of King Cove, Alaska 22:09 UTC
8. 2.9 183 km SSE of King Cove, Alaska 12:19 UTC
9. 2.7 217 km SSE of King Cove, Alaska 17:21 UTC
10. 2.8 199 km SSE of King Cove, Alaska 08:47 UTC
11. 2.4 169 km SSE of King Cove, Alaska 20:56 UTC
12. 3.2 222 km SSE of King Cove, Alaska 01:40 UTC
13. 2.9 200 km SSE of King Cove, Alaska 05:56 UTC
14. 2.9 212 km SSE of King Cove, Alaska 10:10 UTC
15. 2.9 215 km SSE of King Cove, Alaska 09:55 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 22:20 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 5.7 on 2017-05-28 — it released about 4,000 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.