QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

Earthquake near Lame Deer, MT

USGS: 6 km NE of Ashland, Montana

6:38 am MST, Jan 15, 2023 · · 11 km deep · released about 480 lb of TNT

Every earthquake near Lame Deer Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Powder River County 56 kmRosebud County 70 kmCuster County 87 kmBig Horn County 105 kmTreasure County 106 kmSheridan County 108 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
6:38 am MST on 15 January 2023 ()
Where
36 km (22 mi) E of Lame Deer, MT · earthquakes near Lame Deer
Magnitude
M 2.8 (ml)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Powder River County, 56 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1281 days ago

A magnitude 2.8 earthquake was recorded 36 km (22 mi) E of Lame Deer, MT, at 6:38 am MST on 15 January 2023 (13:38 UTC). This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

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 45.6275, -106.2045. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Powder River County, MT 56 km (35 mi) ESE earthquakes near Powder River County
Rosebud County, MT 70 km (44 mi) NNW earthquakes near Rosebud County
Custer County, MT 87 km (54 mi) NE earthquakes near Custer County
Big Horn County, MT 105 km (65 mi) WSW earthquakes near Big Horn County
Treasure County, MT 106 km (66 mi) NW earthquakes near Treasure County
Sheridan County, WY 108 km (67 mi) SSW earthquakes near Sheridan County

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

Aftershocks so far

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

  1. 3.0 9 km WSW of Colstrip, Montana
  2. 3.1 11 km SW of Colstrip, Montana
  3. 3.3 12 km SW of Colstrip, Montana
  4. 2.9 10 km SSE of Colstrip, Montana
  5. 3.3 15 km SE of Colstrip, Montana
  6. 3.2 8 km NNE of Colstrip, Montana
  7. 2.9 8 km SSW of Colstrip, Montana
  8. 3.1 7 km SW of Colstrip, Montana
  9. 2.9 6 km WSW of Colstrip, Montana
  10. 3.1 10 km N of Muddy, Montana
  11. 3.1 12 km NNE of Colstrip, Montana
  12. 3.3 5 km W of Colstrip, Montana
  13. 3.1 14 km N of Lame Deer, Montana
  14. 3.2 4 km SSW of Colstrip, Montana
  15. 3.3 4 km S of Colstrip, 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.