218 km W of Ferndale, California

Yes. A magnitude 5.7 earthquake was recorded 218 km W of Ferndale, California at 19:50 UTC on 2017-09-22, 13 km deep. 115 people have reported feeling it to USGS.

2017-09-22 19:50 UTC · 13 km deep · released about 5.4 kilotons of TNT

Felt it? Tell USGS Check my area

Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.

When: 2017-09-22 19:50 UTC
Magnitude: M 5.7 (mww)
Depth: 13 km below the surface
Felt: 115 reports · strongest reported intensity IV
Measured shaking: intensity III (ShakeMap)
USGS impact alert: green
Tsunami: USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Status: Reviewed by a seismologist

USGS · last changed by USGS 1655 days ago · we first saw it 1655 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre.

At this magnitude and depth, people at rest would likely notice it out to about 293 km (182 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 5.4 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.7 would have released about 32 times as much.

Loma Prieta, California 1989 M 6.9 63× the energy of this one
Northridge, California 1994 M 6.7 32× the energy of this one
Mineral, Virginia 2011 M 5.8 1.4× the energy of this one
This earthquake M 5.7 about 5.4 kilotons of TNT
Around the size people start to feel M 3.0 this one released 11,000× 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.

For this area

The largest earthquake within 50 km (31 mi) since our catalogue begins in 2016. The previous largest was M 4.7 on 2016-12-08.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Map loads when it scrolls into view

Aftershocks so far

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

2.7 199 km W of Ferndale, California 04:33 UTC
2.6 193 km W of Ferndale, California 05:14 UTC
3.3 217 km W of Ferndale, California 20:21 UTC
4.2 241 km W of Ferndale, California 10:50 UTC
2.5 189 km W of Ferndale, California 19:29 UTC
2.6 200 km W of Ferndale, California 14:42 UTC
3.0 215 km W of Ferndale, California 06:34 UTC
3.1 231 km W of Ferndale, California 16:22 UTC
2.6 199 km W of Ferndale, California 11:13 UTC
3.3 216 km W of Ferndale, California 03:31 UTC
3.3 246 km W of Ferndale, California 17:08 UTC
3.1 209 km W of Ferndale, California 07:05 UTC
5.0 259 km W of Ferndale, California 06:46 UTC
3.3 252 km W of Ferndale, California 06:29 UTC
3.7 232 km W of Ferndale, California 17:53 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 19:13 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

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.