3 km NNW of Coram, Montana

2021-07-02 08:20 UTC · 7.8 km deep · released about 21 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: 2021-07-02 08:20 UTC
Magnitude: M 1.9 (ml)
Depth: 7.8 km below the surface
Felt: no reports yet
Nearest: Flathead County, 16 km S
Status: Reviewed by a seismologist

USGS · last changed by USGS 1913 days ago · we first saw it 1913 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
Magna, Utah 2020 M 5.7 520,000× the energy of this one
Around the size people start to feel M 3.0 46× the energy of this one
This earthquake M 1.9 about 21 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 48.4425, -114.0655. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Flathead County, MT	16 km (10 mi)	N of here	earthquakes near Flathead County
Glacier County, MT	84 km (52 mi)	WSW of here	earthquakes near Glacier County
Lake County, MT	89 km (55 mi)	N of here	earthquakes near Lake County
Lincoln County, MT	104 km (64 mi)	E of here	earthquakes near Lincoln County
Sanders County, MT	113 km (70 mi)	NE of here	earthquakes near Sanders County

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

Aftershocks so far

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

2.0 5 km SSW of West Glacier, Montana 07:12 UTC
1.8 12 km NE of Forest Hill Village, Montana 20:38 UTC
1.9 12 km ESE of Evergreen, Montana 22:55 UTC
1.7 30 km ESE of Martin City, Montana 17:00 UTC
2.3 6 km NNE of Olney, Montana 03:53 UTC
2.3 10 km NNW of Swan Lake, Montana 08:44 UTC
1.7 15 km NNE of Bigfork, Montana 03:18 UTC
1.7 5 km ESE of Lakeside, Montana 17:51 UTC
1.6 3 km NNE of Somers, Montana 04:12 UTC
2.0 1 km ENE of Columbia Falls, Montana 04:28 UTC
1.6 Western Montana 20:53 UTC
2.1 8 km NNW of Bigfork, Montana 22:33 UTC
1.7 11 km NW of Batavia, Montana 15:52 UTC
1.6 12 km NNW of Batavia, Montana 02:55 UTC
2.1 16 km NNE of Swan Lake, Montana 00:56 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 08:48 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.