QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km W of Ponderosa Pines, Montana

· 3.9 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Broadwater County 34 kmJefferson County 50 kmGallatin County 60 kmMeagher County 73 kmMadison County 87 kmPark County 93 kmSilver Bow County 97 kmSweet Grass 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 1.8 (ml)
Depth
3.9 km below the surface
Felt
no reports yet
Nearest
Broadwater County, 34 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2985 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 46.0300, -111.4217. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Broadwater County, MT 34 km (21 mi) S of here earthquakes near Broadwater County
Jefferson County, MT 50 km (31 mi) ESE of here earthquakes near Jefferson County
Gallatin County, MT 60 km (37 mi) NNW of here earthquakes near Gallatin County
Meagher County, MT 73 km (45 mi) SSW of here earthquakes near Meagher County
Madison County, MT 87 km (54 mi) NNE of here earthquakes near Madison County
Park County, MT 93 km (58 mi) NW of here earthquakes near Park 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. 1.7 1 km WSW of Manhattan, Montana
  2. 2.1 2 km W of Manhattan, Montana
  3. 2.2 1 km W of Manhattan, Montana
  4. 1.6 2 km WNW of Manhattan, Montana
  5. 1.7 3 km NW of Manhattan, Montana
  6. 1.6 1 km WNW of Manhattan, Montana
  7. 1.8 2 km WNW of Manhattan, Montana
  8. 1.6 3 km WNW of Manhattan, Montana
  9. 2.3 2 km WSW of Manhattan, Montana
  10. 1.6 1 km WSW of Manhattan, Montana
  11. 1.7 2 km WNW of Manhattan, Montana
  12. 1.9 2 km WNW of Manhattan, Montana
  13. 1.6 1 km W of Manhattan, Montana
  14. 2.3 1 km WNW of Manhattan, Montana
  15. 1.6 1 km WNW of Manhattan, 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.