241 km W of Ferndale, California

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 24 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 40.4901, -127.1107. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.1 245 km W of Ferndale, California 11:37 UTC
2. 3.2 222 km W of Ferndale, California 20:10 UTC
3. 3.4 258 km W of Ferndale, California 00:01 UTC
4. 3.4 262 km W of Ferndale, California 07:47 UTC
5. 2.7 232 km W of Ferndale, California 10:10 UTC
6. 2.9 238 km W of Ferndale, California 15:25 UTC
7. 2.7 219 km W of Ferndale, California 17:12 UTC
8. 2.9 254 km W of Ferndale, California 07:17 UTC
9. 2.8 238 km W of Ferndale, California 03:08 UTC
10. 2.9 234 km W of Ferndale, California 08:30 UTC
11. 2.8 234 km W of Ferndale, California 10:23 UTC
12. 2.9 225 km W of Ferndale, California 02:27 UTC
13. 2.9 253 km W of Ferndale, California 06:47 UTC
14. 2.6 287 km W of Ferndale, California 09:49 UTC
15. 2.6 272 km W of Ferndale, California 07:48 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 23:32 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 2017-09-22 — it released about 180 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.