Earthquake near Salmon, ID

USGS: 33 km SSE of Salmon, Idaho

12:51 am MDT, May 13, 2018 · 2018-05-13 06:51 UTC · 4.4 km deep · released about 69 lb of TNT

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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: 12:51 am MDT on 13 May 2018 (2018-05-13 06:51 UTC)
Where: 34 km (21 mi) SSE of Salmon, ID · earthquakes near Salmon
Magnitude: M 2.2 (ml)
Depth: 4.4 km below the surface
Felt: no reports yet
Nearest: Lemhi County, 17 km W
Nearest mapped fault: Beaverhead fault, 4 km from its surface trace — near is not the same as on
Status: Reviewed by a seismologist

USGS · last changed by USGS 3065 days ago · we first saw it 3065 days ago

A magnitude 2.2 earthquake was recorded 34 km (21 mi) SSE of Salmon, ID, at 12:51 am MDT on 13 May 2018 (06:51 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 69 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 5.8 220,000× the energy of this one
Magna, Utah 2020 M 5.7 150,000× the energy of this one
Around the size people start to feel M 3.0 14× the energy of this one
This earthquake M 2.2 about 69 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

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

Epicentre 44.9143, -113.6733. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction from the epicentre
Lemhi County, ID	17 km (11 mi)	W	earthquakes near Lemhi County
Beaverhead County, MT	66 km (41 mi)	ENE	earthquakes near Beaverhead County
Custer County, ID	85 km (53 mi)	SSW	earthquakes near Custer County
Clark County, ID	125 km (78 mi)	ESE	earthquakes near Clark County
Silver Bow County, MT	135 km (84 mi)	NE	earthquakes near Silver Bow County

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

Aftershocks so far

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

1.6 4 km NNE of Salmon, Idaho 08:54 UTC
2.0 7 km WSW of Leadore, Idaho 21:27 UTC
2.5 21 km NNE of Challis, Idaho 03:20 UTC
2.2 31 km NE of Challis, Idaho 02:10 UTC
3.0 26 km WSW of Leadore, Idaho 11:34 UTC
1.9 18 km S of Salmon, Idaho 00:36 UTC
1.8 18 km NNE of Challis, Idaho 20:08 UTC
1.6 14 km ENE of Challis, Idaho 23:27 UTC
2.4 15 km NE of Challis, Idaho 08:21 UTC
2.0 12 km NNE of Salmon, Idaho 08:37 UTC
2.3 22 km NNE of Challis, Idaho 05:14 UTC
1.8 22 km NNE of Challis, Idaho 01:14 UTC
1.9 23 km NNE of Challis, Idaho 13:51 UTC
1.8 14 km S of Salmon, Idaho 01:18 UTC
1.5 21 km E of Challis, Idaho 12:26 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 02:08 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.