254 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. 12 people have reported feeling it to USGS.

How big was it?

This earthquake released about 120 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.6 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 1,400× the energy of this one
2. Mineral, Virginia 2011 M 5.8 63× the energy of this one
3. Magna, Utah 2020 M 5.7 45× the energy of this one
4. This earthquake M 4.6 about 120 tons of TNT
5. Around the size people start to feel M 3.0 this one released 250× 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 40.8267, -127.2626. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 3.4 258 km W of Ferndale, California 00:01 UTC
2. 2.7 232 km W of Ferndale, California 10:10 UTC
3. 2.7 219 km W of Ferndale, California 17:12 UTC
4. 2.8 238 km W of Ferndale, California 03:08 UTC
5. 2.9 253 km W of Ferndale, California 06:47 UTC
6. 2.6 272 km W of Ferndale, California 07:48 UTC
7. 2.7 224 km W of Ferndale, California 08:15 UTC
8. 4.5 268 km W of Indianola, California 10:49 UTC
9. 3.2 262 km W of Indianola, California 10:45 UTC
10. 4.4 260 km WSW of Crescent City, California 10:26 UTC
11. 3.2 275 km W of Indianola, California 08:02 UTC
12. 3.2 263 km WNW of Indianola, California 07:38 UTC
13. 3.4 258 km W of Indianola, California 07:09 UTC
14. 3.6 252 km WSW of Crescent City, California 07:08 UTC
15. 3.3 267 km W of Ferndale, California 15:10 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 21:10 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 5.3 on 2020-05-18 — it released about 11 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.