224 km SE of Chiniak, Alaska

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 240 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.8 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 710× the energy of this one
2. Mineral, Virginia 2011 M 5.8 32× the energy of this one
3. Magna, Utah 2020 M 5.7 22× the energy of this one
4. This earthquake M 4.8 about 240 tons of TNT
5. Around the size people start to feel M 3.0 this one released 500× 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 56.2797, -149.5122. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 2.4 249 km SE of Chiniak, Alaska 02:18 UTC
2. 3.1 232 km SE of Chiniak, Alaska 19:06 UTC
3. 2.5 242 km SE of Chiniak, Alaska 16:18 UTC
4. 4.3 245 km SE of Chiniak, Alaska 14:32 UTC
5. 2.6 235 km SE of Chiniak, Alaska 02:12 UTC
6. 3.0 251 km SE of Chiniak, Alaska 16:02 UTC
7. 4.2 250 km SE of Chiniak, Alaska 15:38 UTC
8. 2.8 238 km SE of Chiniak, Alaska 15:04 UTC
9. 2.9 232 km SE of Chiniak, Alaska 07:25 UTC
10. 3.6 261 km SE of Chiniak, Alaska 06:55 UTC
11. 2.9 238 km SE of Chiniak, Alaska 05:51 UTC
12. 2.8 236 km SE of Chiniak, Alaska 01:14 UTC
13. 2.8 231 km SE of Chiniak, Alaska 15:05 UTC
14. 2.9 230 km SE of Chiniak, Alaska 13:30 UTC
15. 2.8 236 km SE of Chiniak, Alaska 21:53 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 23:38 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 7.9 on 2018-01-23 — it released about 45,000 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.