4 km WNW of Hebgen Lake Estates, Montana

2020-08-03 20:41 UTC · 13 km deep · released about 11 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: 2020-08-03 20:41 UTC
Magnitude: M 1.7 (ml)
Depth: 13 km below the surface
Felt: no reports yet
Nearest: Fremont County, 65 km SSW
Status: Reviewed by a seismologist

USGS · last changed by USGS 2246 days ago · we first saw it 2246 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
Magna, Utah 2020 M 5.7 970,000× the energy of this one
Around the size people start to feel M 3.0 86× the energy of this one
This earthquake M 1.7 about 11 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 44.7803, -111.2467. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Fremont County, ID	65 km (41 mi)	NNE of here	earthquakes near Fremont County
Madison County, MT	80 km (50 mi)	SE of here	earthquakes near Madison County
Gallatin County, MT	82 km (51 mi)	S of here	earthquakes near Gallatin County
Park County, MT	94 km (59 mi)	SW of here	earthquakes near Park County
Clark County, ID	103 km (64 mi)	ENE of here	earthquakes near Clark County
Teton County, WY	104 km (65 mi)	NW of here	earthquakes near Teton 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.

1.8 30 km ESE of West Yellowstone, Montana 08:56 UTC
1.9 23 km SSW of Mammoth, Wyoming 23:00 UTC
1.8 22 km SSW of Mammoth, Wyoming 15:13 UTC
2.4 27 km WNW of Hebgen Lake Estates, Montana 10:09 UTC
1.6 28 km WNW of Hebgen Lake Estates, Montana 15:42 UTC
1.6 27 km WNW of Hebgen Lake Estates, Montana 23:45 UTC
2.1 15 km NE of West Yellowstone, Montana 01:20 UTC
1.5 17 km ESE of West Yellowstone, Montana 01:14 UTC
1.8 17 km ESE of West Yellowstone, Montana 21:29 UTC
1.6 32 km S of Ennis, Montana 04:17 UTC
1.6 13 km SE of West Yellowstone, Montana 21:42 UTC
1.6 23 km WNW of Hebgen Lake Estates, Montana 15:25 UTC
2.0 22 km WNW of Hebgen Lake Estates, Montana 12:50 UTC
1.6 26 km SSE of West Yellowstone, Montana 23:45 UTC
2.2 1 km SSW of West Yellowstone, Montana 07:18 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 11:53 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 9,400 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.