247 km ESE of Chiniak, 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 56.5755, -148.6634. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.0 245 km SE of Chiniak, Alaska 02:03 UTC
2. 2.8 222 km ESE of Chiniak, Alaska 21:09 UTC
3. 3.0 250 km ESE of Chiniak, Alaska 16:21 UTC
4. 3.4 254 km ESE of Chiniak, Alaska 13:22 UTC
5. 3.0 253 km ESE of Chiniak, Alaska 12:20 UTC
6. 3.2 248 km ESE of Chiniak, Alaska 11:18 UTC
7. 2.7 224 km ESE of Chiniak, Alaska 09:21 UTC
8. 3.5 259 km ESE of Chiniak, Alaska 08:02 UTC
9. 3.4 252 km ESE of Chiniak, Alaska 08:01 UTC
10. 2.9 255 km ESE of Chiniak, Alaska 07:34 UTC
11. 3.0 263 km SE of Chiniak, Alaska 02:19 UTC
12. 3.3 259 km SE of Chiniak, Alaska 02:13 UTC
13. 3.6 270 km SE of Chiniak, Alaska 23:29 UTC
14. 2.8 251 km ESE of Chiniak, Alaska 21:55 UTC
15. 2.7 211 km ESE of Chiniak, Alaska 19:55 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 02:07 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 5.5 on 2018-01-23 — it released about 89 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.