18 km SW of Amsterdam, Montana

2019-09-26 12:03 UTC · 2.3 km deep · released about 26 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: 2019-09-26 12:03 UTC
Magnitude: M 2.0 (ml)
Depth: 2.3 km below the surface
Felt: no reports yet
Nearest: Gallatin County, 26 km ESE
Status: Reviewed by a seismologist

USGS · last changed by USGS 2558 days ago · we first saw it 2558 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 26 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 580,000× the energy of this one
Magna, Utah 2020 M 5.7 410,000× the energy of this one
Around the size people start to feel M 3.0 36× the energy of this one
This earthquake M 2.0 about 26 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 45.6197, -111.4610. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Gallatin County, MT	26 km (16 mi)	WNW of here	earthquakes near Gallatin County
Madison County, MT	48 km (30 mi)	NE of here	earthquakes near Madison County
Jefferson County, MT	73 km (45 mi)	SE of here	earthquakes near Jefferson County
Park County, MT	74 km (46 mi)	WNW of here	earthquakes near Park County
Broadwater County, MT	79 km (49 mi)	S of here	earthquakes near Broadwater County
Silver Bow County, MT	98 km (61 mi)	ESE of here	earthquakes near Silver Bow County

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

Aftershocks so far

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

1.9 Western Montana 16:22 UTC
1.9 6 km E of Willow Creek, Montana 15:26 UTC
2.2 6 km NNE of Manhattan, Montana 20:43 UTC
1.6 5 km NE of Logan, Montana 10:52 UTC
1.6 13 km SSE of Pony, Montana 20:27 UTC
2.1 6 km NNE of Manhattan, Montana 18:38 UTC
2.0 4 km N of Logan, Montana 21:24 UTC
1.6 4 km NNW of Logan, Montana 21:46 UTC
2.6 4 km W of Belgrade, Montana 03:20 UTC
1.8 Western Montana 20:47 UTC
2.4 2 km SW of Ponderosa Pines, Montana 08:03 UTC
1.6 2 km ENE of Manhattan, Montana 14:27 UTC
2.0 3 km WNW of Manhattan, Montana 14:43 UTC
2.3 2 km W of Manhattan, Montana 10:16 UTC
1.7 8 km S of Ponderosa Pines, Montana 20:41 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 08:51 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 4.2 on 2019-08-16 — it released about 2,300 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

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.