QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

2 km W of Manhattan, Montana

· 5.0 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Gallatin County 40 kmBroadwater County 54 kmJefferson County 61 kmMadison County 72 kmPark County 78 kmMeagher County 89 kmSilver Bow County 100 kmSweet Grass County 110 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 2.7 (ml)
Depth
5.0 km below the surface
Felt
58 reports · strongest reported intensity III
Nearest
Gallatin County, 40 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2332 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 58 people have reported feeling it to USGS.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 45.8517, -111.3695. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Gallatin County, MT 40 km (25 mi) NNW of here earthquakes near Gallatin County
Broadwater County, MT 54 km (34 mi) S of here earthquakes near Broadwater County
Jefferson County, MT 61 km (38 mi) ESE of here earthquakes near Jefferson County
Madison County, MT 72 km (45 mi) NE of here earthquakes near Madison County
Park County, MT 78 km (48 mi) NW of here earthquakes near Park County
Meagher County, MT 89 km (55 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

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

  1. 1.9 14 km SW of Radersburg, Montana
  2. 1.9 14 km SW of Radersburg, Montana
  3. 1.6 15 km SW of Radersburg, Montana
  4. 2.2 10 km NE of Toston, Montana
  5. 1.5 1 km ENE of Toston, Montana
  6. 1.6 2 km E of Logan, Montana
  7. 1.7 5 km ENE of Logan, Montana
  8. 1.5 4 km NW of Logan, Montana
  9. 1.8 7 km WSW of Willow Creek, Montana
  10. 1.9 Western Montana
  11. 1.6 9 km SW of Radersburg, Montana
  12. 1.9 6 km E of Willow Creek, Montana
  13. 1.6 6 km N of Radersburg, Montana
  14. 2.2 6 km NNE of Manhattan, Montana
  15. 1.9 7 km SW of Radersburg, 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 180 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.