251 km W of Ferndale, California

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 7 people have reported feeling it to USGS.

How big was it?

This earthquake released about 670 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.1 would have released about 32 times as much.

1. Northridge, California 1994 M 6.7 250× the energy of this one
2. Mineral, Virginia 2011 M 5.8 11× the energy of this one
3. Magna, Utah 2020 M 5.7 7.9× the energy of this one
4. This earthquake M 5.1 about 670 tons of TNT
5. Around the size people start to feel M 3.0 this one released 1,400× 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 40.9167, -127.2074. Map © OpenStreetMap contributors.

Aftershocks so far

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

1. 4.2 241 km W of Ferndale, California 10:50 UTC
2. 3.0 251 km W of Ferndale, California 20:39 UTC
3. 3.0 249 km W of Ferndale, California 15:49 UTC
4. 3.0 255 km W of Ferndale, California 07:34 UTC
5. 4.6 254 km W of Ferndale, California 07:10 UTC
6. 3.0 242 km W of Ferndale, California 06:31 UTC
7. 5.3 249 km W of Ferndale, California 07:02 UTC
8. 5.0 251 km W of Ferndale, California 06:56 UTC
9. 3.1 231 km W of Ferndale, California 16:22 UTC
10. 3.3 246 km W of Ferndale, California 17:08 UTC
11. 3.1 264 km W of Ferndale, California 07:14 UTC
12. 3.2 274 km W of Ferndale, California 07:12 UTC
13. 3.1 209 km W of Ferndale, California 07:05 UTC
14. 5.0 259 km W of Ferndale, California 06:46 UTC
15. 3.3 252 km W of Ferndale, California 06:29 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 20:33 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 4.3 on 2016-01-28.

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.