28km NW of Weaverville, CA

2021-06-25 22:17 UTC · 32 km deep · released about 56 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: 2021-06-25 22:17 UTC
Magnitude: M 2.2 (md)
Depth: 32 km below the surface
Felt: no reports yet
Nearest: Trinity County, 27 km SSE
Status: Reviewed by a seismologist

USGS · last changed by USGS 1919 days ago · we first saw it 1919 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 56 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 270,000× the energy of this one
Magna, Utah 2020 M 5.7 190,000× the energy of this one
Around the size people start to feel M 3.0 17× the energy of this one
This earthquake M 2.2 about 56 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 40.8842, -123.2100. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Trinity County, CA	27 km (17 mi)	NNW of here	earthquakes near Trinity County
Humboldt County, CA	63 km (39 mi)	ENE of here	earthquakes near Humboldt County
Siskiyou County, CA	97 km (60 mi)	SW of here	earthquakes near Siskiyou County
Shasta County, CA	99 km (62 mi)	W of here	earthquakes near Shasta County
Del Norte County, CA	116 km (72 mi)	SE of here	earthquakes near Del Norte County
Tehama County, CA	118 km (73 mi)	NW of here	earthquakes near Tehama County

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

Aftershocks so far

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

2.4 17km E of Willow Creek, CA 16:37 UTC
2.2 20km WSW of Hayfork, CA 07:57 UTC
2.9 5km N of Willow Creek, CA 12:35 UTC
2.1 29km E of Willow Creek, CA 05:46 UTC
2.7 21km ESE of Weitchpec, CA 08:02 UTC
2.1 28km WNW of Hayfork, CA 02:16 UTC
2.3 15km E of Willow Creek, CA 13:30 UTC
2.2 17km S of Weaverville, CA 17:25 UTC
2.4 17km ENE of Willow Creek, CA 08:49 UTC
1.8 20km SSE of Willow Creek, CA 16:10 UTC
2.1 25km WNW of Weaverville, CA 11:32 UTC
2.0 7km W of Willow Creek, CA 18:55 UTC
2.4 14km E of Willow Creek, CA 21:27 UTC
2.3 28km ENE of Willow Creek, CA 05:26 UTC
2.1 26km ESE of Willow Creek, CA 06:13 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 15:00 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.