QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

29 km ESE of Mammoth, Wyoming

Yes. A magnitude 1.9 earthquake was recorded 29 km ESE of Mammoth, Wyoming, at 7:20 am MDT on 13 June 2023 (13:20 UTC), 13 km deep.

· 13 km deep · released about 23 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Park County 68 kmPark County 73 kmTeton County 90 kmGallatin County 96 kmSweet Grass County 111 kmCarbon County 112 kmFremont County 114 kmStillwater County 117 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
13 km below the surface
Felt
no reports yet
Nearest
Park County, 68 km NNW
Nearest mapped fault
Mirror Plateau faults, 4 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1249 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 8 km (5 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 23 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 660,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 470,000× the energy of this one
  3. Around the size people start to feel M 3.0 42× the energy of this one
  4. This earthquake M 1.9 about 23 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.2 on 2022-05-11 — about 2,800 times the energy of this one.

Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.5 14 km N of Madison Junction, Wyoming · 43 km WSW of this epicentre
  2. 6.3 22 km SW of Mammoth, Wyoming · 40 km W of this epicentre
  3. 6.0 21 km E of West Yellowstone, Montana · 44 km WSW of this epicentre
  4. 5.9 26 km SSE of Mammoth, Wyoming · 23 km WSW of this epicentre
  5. 5.7 13 km SSW of Mammoth, Wyoming · 31 km W of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 44.8595, -110.3635. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Park County, MT 68 km (43 mi) NNW earthquakes near Park County
Park County, WY 73 km (46 mi) ESE earthquakes near Park County
Teton County, WY 90 km (56 mi) S earthquakes near Teton County
Gallatin County, MT 96 km (60 mi) NW earthquakes near Gallatin County
Sweet Grass County, MT 111 km (69 mi) NNE earthquakes near Sweet Grass County
Carbon County, MT 112 km (70 mi) ENE 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. 2.1 30 km ESE of West Yellowstone, Montana
  2. 3.3 29 km ESE of West Yellowstone, Montana
  3. 1.7 29 km ESE of West Yellowstone, Montana
  4. 2.0 28 km ESE of West Yellowstone, Montana
  5. 1.6 29 km ESE of West Yellowstone, Montana
  6. 2.1 29 km ESE of West Yellowstone, Montana
  7. 1.7 29 km ESE of West Yellowstone, Montana
  8. 2.0 29 km ESE of West Yellowstone, Montana
  9. 2.1 29 km ESE of West Yellowstone, Montana
  10. 2.6 29 km ESE of West Yellowstone, Montana
  11. 1.5 29 km ESE of West Yellowstone, Montana
  12. 3.1 29 km ESE of West Yellowstone, Montana
  13. 2.5 29 km ESE of West Yellowstone, Montana
  14. 1.6 29 km ESE of West Yellowstone, Montana
  15. 1.6 49 km ESE 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.

On USGS

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