21 km SE of Stites, Idaho

2018-11-20 22:39 UTC · 13 km deep · released about 21 tons 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: 2018-11-20 22:39 UTC
Magnitude: M 4.1 (mwr)
Depth: 13 km below the surface
Felt: 96 reports · strongest reported intensity VI
Measured shaking: intensity IV (ShakeMap)
USGS impact alert: green
Nearest: Idaho County, 27 km ESE
Status: Reviewed by a seismologist

USGS · last changed by USGS 2370 days ago · we first saw it 2370 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 96 people have reported feeling it to USGS.

How big was it?

This earthquake released about 21 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

Northridge, California 1994 M 6.7 7,900× the energy of this one
Mineral, Virginia 2011 M 5.8 350× the energy of this one
Magna, Utah 2020 M 5.7 250× the energy of this one
This earthquake M 4.1 about 21 tons of TNT
Around the size people start to feel M 3.0 this one released 45× 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

Map loads when it scrolls into view

Epicentre 45.9525, -115.7774. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Idaho County, ID	27 km (17 mi)	WNW of here	earthquakes near Idaho County
Lewis County, ID	59 km (37 mi)	ESE of here	earthquakes near Lewis County
Clearwater County, ID	81 km (50 mi)	S of here	earthquakes near Clearwater County
Nez Perce County, ID	87 km (54 mi)	ESE of here	earthquakes near Nez Perce County
Asotin County, WA	115 km (71 mi)	ESE of here	earthquakes near Asotin County
Wallowa County, OR	116 km (72 mi)	ENE of here	earthquakes near Wallowa County

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

Aftershocks so far

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

2.2 4 km SSE of Grangeville, Idaho 19:06 UTC
1.7 26 km NE of Riggins, Idaho 05:20 UTC
2.2 11 km SE of Weippe, Idaho 01:00 UTC
1.7 28 km ESE of Weippe, Idaho 21:41 UTC
1.6 20 km SE of White Bird, Idaho 14:30 UTC
1.8 Northern Idaho 19:10 UTC
1.7 Northern Idaho 00:40 UTC
1.5 7 km WNW of Grangeville, Idaho 09:19 UTC
2.4 28 km SSW of Elk City, Idaho 19:33 UTC
1.6 2 km E of Kamiah, Idaho 19:40 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 08:09 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.