Earthquake near Clinton, MT

USGS: 22 km SE of Clinton, Montana

49 km (31 mi) ESE of Missoula, MT

6:37 pm MDT, Sep 5, 2018 · 2018-09-06 00:37 UTC · 4.5 km deep · released about 6.6 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: 6:37 pm MDT on 5 September 2018 (2018-09-06 00:37 UTC)
Where: 23 km (14 mi) SE of Clinton, MT · earthquakes near Clinton
Magnitude: M 1.6 (ml)
Depth: 4.5 km below the surface
Felt: no reports yet
Nearest: Granite County, 28 km S
Status: Reviewed by a seismologist

USGS · last changed by USGS 2949 days ago · we first saw it 2949 days ago

A magnitude 1.6 earthquake was recorded 23 km (14 mi) SE of Clinton, MT, at 6:37 pm MDT on 5 September 2018 (00:37 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 6.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 2,300,000× the energy of this one
Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
Around the size people start to feel M 3.0 140× the energy of this one
This earthquake M 1.6 about 6.6 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 46.6442, -113.4760. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction from the epicentre
Granite County, MT	28 km (17 mi)	S	earthquakes near Granite County
Powell County, MT	47 km (29 mi)	ENE	earthquakes near Powell County
Missoula County, MT	53 km (33 mi)	NW	earthquakes near Missoula County
Deer Lodge County, MT	66 km (41 mi)	SSE	earthquakes near Deer Lodge County
Ravalli County, MT	79 km (49 mi)	SW	earthquakes near Ravalli County
Lewis and Clark County, MT	99 km (61 mi)	ENE	earthquakes near Lewis and Clark County

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

Aftershocks so far

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

2.9 22 km WSW of Ovando, Montana 14:06 UTC
2.4 10 km S of Ovando, Montana 09:40 UTC
1.8 17 km ENE of Drummond, Montana 19:19 UTC
2.3 16 km ENE of Drummond, Montana 20:06 UTC
1.9 7 km WSW of Drummond, Montana 17:45 UTC
1.8 2 km S of Turah, Montana 09:16 UTC
1.6 10 km WSW of Drummond, Montana 23:12 UTC
1.7 15 km WSW of Drummond, Montana 19:44 UTC
1.5 21 km NNW of Drummond, Montana 11:11 UTC
1.6 6 km NW of Drummond, Montana 18:22 UTC
1.5 4 km S of Drummond, Montana 18:06 UTC
1.9 13 km WNW of Ovando, Montana 00:51 UTC
1.9 19 km W of Drummond, Montana 14:19 UTC
1.8 18 km W of Drummond, Montana 13:25 UTC
1.5 18 km W of Drummond, Montana 06:39 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 02:06 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.