3km E of Willits, CA

2022-08-13 17:43 UTC · 4.8 km deep · released about 130 lb of TNT

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: 2022-08-13 17:43 UTC
Magnitude: M 2.4 (md)
Depth: 4.8 km below the surface
Felt: 27 reports · strongest reported intensity IV
Nearest: Mendocino County, 11 km WNW
Status: Reviewed by a seismologist

USGS · last changed by USGS 1505 days ago · we first saw it 1505 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 27 people have reported feeling it to USGS.

How big was it?

This earthquake released about 130 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
Magna, Utah 2020 M 5.7 80,000× the energy of this one
Around the size people start to feel M 3.0 7.2× the energy of this one
This earthquake M 2.4 about 130 lb of TNT

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

Map loads when it scrolls into view

Epicentre 39.4078, -123.3243. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Mendocino County, CA	11 km (7 mi)	ESE of here	earthquakes near Mendocino County
Lake County, CA	60 km (37 mi)	NW of here	earthquakes near Lake County
Glenn County, CA	82 km (51 mi)	WSW of here	earthquakes near Glenn County
Colusa County, CA	97 km (60 mi)	WNW of here	earthquakes near Colusa County
Sonoma County, CA	104 km (65 mi)	NNW of here	earthquakes near Sonoma County
Tehama County, CA	123 km (76 mi)	SW of here	earthquakes near Tehama County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

1.9 11km NNW of Lake Pillsbury, CA 14:42 UTC
2.0 16km N of Lake Pillsbury, CA 22:43 UTC
1.6 12km SE of Talmage, CA 06:52 UTC
1.9 5km ESE of Lake Pillsbury, CA 23:34 UTC
1.9 5km E of Covelo, CA 14:05 UTC
1.8 4km E of Covelo, CA 08:13 UTC
1.7 10km SE of Talmage, CA 23:41 UTC
2.0 11km N of Lake Pillsbury, CA 04:09 UTC
2.7 9km SE of Talmage, CA 19:42 UTC
1.8 5km ESE of Lake Pillsbury, CA 01:27 UTC
2.0 12km W of Lakeport, CA 00:37 UTC
1.5 4km SW of Brooktrails, CA 20:38 UTC
1.7 12km N of Brooktrails, CA 07:01 UTC
1.7 14km N of Lake Pillsbury, CA 06:55 UTC
1.6 18km NW of Lake Pillsbury, CA 20:06 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 16:05 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 5.1 on 2016-08-10 — it released about 9,800 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.