QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

5 km SW of Manhattan, Montana

· 5.0 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Gallatin County 38 kmBroadwater County 57 kmJefferson County 62 kmMadison County 69 kmPark County 78 kmMeagher County 92 kmSilver Bow County 99 kmSweet Grass County 112 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 1.5 (ml)
Depth
5.0 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Gallatin County, 38 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1457 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 45.8254, -111.3891. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Gallatin County, MT 38 km (24 mi) NNW of here earthquakes near Gallatin County
Broadwater County, MT 57 km (35 mi) S of here earthquakes near Broadwater County
Jefferson County, MT 62 km (38 mi) ESE of here earthquakes near Jefferson County
Madison County, MT 69 km (43 mi) NE of here earthquakes near Madison County
Park County, MT 78 km (48 mi) WNW of here earthquakes near Park County
Meagher County, MT 92 km (57 mi) SSW of here earthquakes near Meagher County

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

Aftershocks so far

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

  1. 2.0 7 km SE of Pony, Montana
  2. 2.2 11 km S of Radersburg, Montana
  3. 1.8 6 km NNW of Logan, Montana
  4. 1.6 5 km NW of Logan, Montana
  5. 1.6 5 km NW of Logan, Montana
  6. 1.8 8 km N of Manhattan, Montana
  7. 2.5 13 km SSE of Harrison, Montana
  8. 2.4 2 km E of Three Forks, Montana
  9. 1.5 11 km N of Ennis, Montana
  10. 3.0 1 km N of Belgrade, Montana
  11. 1.9 7 km WSW of Radersburg, Montana
  12. 2.4 20 km NNW of Springhill, Montana
  13. 1.5 15 km SSE of Pony, Montana
  14. 2.0 3 km WNW of Pony, Montana
  15. 2.3 3 km WNW of Pony, 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 2019-08-16 — it released about 11,000 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.