QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

8 km ENE of West Yellowstone, Montana

· 7.5 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fremont County 66 kmTeton County 86 kmGallatin County 92 kmPark County 92 kmMadison County 100 kmTeton County 106 kmMadison County 114 kmPark County 114 kmClark County 116 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 1.9 (ml)
Depth
7.5 km below the surface
Felt
no reports yet
Nearest
Fremont County, 66 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1280 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 25 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.

  1. Mineral, Virginia 2011 M 5.8 600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 420,000× the energy of this one
  3. Around the size people start to feel M 3.0 38× the energy of this one
  4. This earthquake M 1.9 about 25 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 44.7015, -111.0050. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fremont County, ID 66 km (41 mi) NE of here earthquakes near Fremont County
Teton County, WY 86 km (53 mi) NNW of here earthquakes near Teton County
Gallatin County, MT 92 km (57 mi) S of here earthquakes near Gallatin County
Park County, MT 92 km (57 mi) SSW of here earthquakes near Park County
Madison County, MT 100 km (62 mi) SE of here earthquakes near Madison County
Teton County, ID 106 km (66 mi) N of here earthquakes near Teton 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. 1.6 Idaho-Montana border region
  2. 1.5 Wyoming
  3. 1.9 Wyoming
  4. 1.7 28 km SSE of Mammoth, Wyoming
  5. 1.7 50 km SE of West Yellowstone, Montana
  6. 1.6 Wyoming
  7. 2.2 26 km SSW of Mammoth, Wyoming
  8. 2.1 Wyoming
  9. 1.6 45 km ESE of West Yellowstone, Montana
  10. 1.7 47 km ESE of West Yellowstone, Montana
  11. 2.8 23 km SSW of Mammoth, Wyoming
  12. 2.3 Wyoming
  13. 2.3 23 km SSW of Mammoth, Wyoming
  14. 1.9 Wyoming
  15. 1.6 15 km NE of West Yellowstone, 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 4.4 on 2017-06-16 — it released about 4,100 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.