QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

40 km SW of Silver Gate, Montana

· 5.0 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Park County 61 kmTeton County 75 kmPark County 85 kmFremont County 109 kmGallatin County 112 kmCarbon County 115 km
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
Magnitude
M 1.8 (ml)
Depth
5.0 km below the surface
Felt
no reports yet
Nearest
Park County, 61 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 767 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 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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

Epicentre 44.7143, -110.2970. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Park County, WY 61 km (38 mi) WNW of here earthquakes near Park County
Teton County, WY 75 km (46 mi) N of here earthquakes near Teton County
Park County, MT 85 km (53 mi) SSE of here earthquakes near Park County
Fremont County, ID 109 km (68 mi) ENE of here earthquakes near Fremont County
Gallatin County, MT 112 km (70 mi) SE of here earthquakes near Gallatin County
Carbon County, MT 115 km (71 mi) WSW of here earthquakes near Carbon County

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

Aftershocks so far

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

  1. 1.7 40 km S of Silver Gate, Montana
  2. 1.6 36 km S of Silver Gate, Montana
  3. 1.6 46 km SE of West Yellowstone, Montana
  4. 1.9 41 km S of Silver Gate, Montana
  5. 1.7 36 km S of Silver Gate, Montana
  6. 1.6 30 km ESE of West Yellowstone, Montana
  7. 1.5 45 km ESE of West Yellowstone, Montana
  8. 2.2 41 km SSE of Mammoth, Wyoming
  9. 2.7 41 km SSE of Mammoth, Wyoming
  10. 2.0 14 km SSW of Mammoth, Wyoming
  11. 1.8 37 km SSE of Silver Gate, Montana
  12. 1.7 29 km SSE of Mammoth, Wyoming
  13. 1.8 37 km S of Silver Gate, Montana
  14. 1.6 37 km S of Silver Gate, Montana
  15. 1.8 48 km S of Silver Gate, Montana

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . 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 2022-05-11 — it released about 3,800 times the energy of this one.

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

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.