30 km WNW of Hebgen Lake Estates, Montana

2019-05-23 15:45 UTC · 12 km deep · released about 85 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: 2019-05-23 15:45 UTC
Magnitude: M 2.3 (ml)
Depth: 12 km below the surface
Felt: 1 report · strongest reported intensity V
Nearest: Madison County, 62 km NNW
Status: Reviewed by a seismologist

USGS · last changed by USGS 2602 days ago · we first saw it 2602 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
Magna, Utah 2020 M 5.7 130,000× the energy of this one
Around the size people start to feel M 3.0 11× the energy of this one
This earthquake M 2.3 about 85 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 44.8287, -111.5677. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Madison County, MT	62 km (38 mi)	SSE of here	earthquakes near Madison County
Fremont County, ID	68 km (42 mi)	N of here	earthquakes near Fremont County
Gallatin County, MT	83 km (52 mi)	SSW of here	earthquakes near Gallatin County
Clark County, ID	86 km (54 mi)	NE of here	earthquakes near Clark County
Park County, MT	107 km (67 mi)	SW of here	earthquakes near Park County
Beaverhead County, MT	110 km (68 mi)	ESE of here	earthquakes near Beaverhead County

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

Aftershocks so far

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

2.4 48 km NNE of Spencer, Idaho 16:56 UTC
2.0 30 km SSE of Virginia City, Montana 07:49 UTC
2.3 28 km W of Hebgen Lake Estates, Montana 13:09 UTC
3.9 28 km W of Hebgen Lake Estates, Montana 13:06 UTC
1.6 6 km SSE of Hebgen Lake Estates, Montana 12:06 UTC
2.6 27 km W of Hebgen Lake Estates, Montana 10:48 UTC
1.6 27 km W of Hebgen Lake Estates, Montana 07:47 UTC
1.6 30 km SSE of Virginia City, Montana 20:30 UTC
2.4 29 km W of Hebgen Lake Estates, Montana 01:41 UTC
1.7 6 km SE of Hebgen Lake Estates, Montana 21:09 UTC
1.8 42 km NE of Spencer, Idaho 03:10 UTC
2.1 8 km ESE of Hebgen Lake Estates, Montana 06:14 UTC
1.6 43 km SSW of Virginia City, Montana 06:07 UTC
2.0 30 km SSE of Virginia City, Montana 16:57 UTC
1.5 34 km S of Virginia City, Montana 21:25 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 14:06 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 4.4 on 2017-06-16 — it released about 1,200 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.