QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

0 km WNW of Manhattan, Montana

· 5.0 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Gallatin County 40 kmBroadwater County 54 kmJefferson County 63 kmMadison County 74 kmPark County 77 kmMeagher County 87 kmSilver Bow County 102 kmSweet Grass 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
Magnitude
M 1.8 (ml)
Depth
5.0 km below the surface
Felt
2 reports · strongest reported intensity IV
Nearest
Gallatin County, 40 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2535 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 45.8588, -111.3430. 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 (33 mi) SSE of here earthquakes near Broadwater County
Jefferson County, MT 63 km (39 mi) ESE of here earthquakes near Jefferson County
Madison County, MT 74 km (46 mi) NE of here earthquakes near Madison County
Park County, MT 77 km (48 mi) NW of here earthquakes near Park County
Meagher County, MT 87 km (54 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

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

  1. 1.5 2 km WNW of Manhattan, Montana
  2. 1.8 1 km W of Manhattan, Montana
  3. 1.7 0 km ESE of Manhattan, Montana
  4. 2.2 9 km SSE of Harrison, Montana
  5. 2.1 3 km WSW of Manhattan, Montana
  6. 2.0 2 km WNW of Manhattan, Montana
  7. 1.8 2 km WNW of Manhattan, Montana
  8. 1.9 9 km SSE of Harrison, Montana
  9. 2.0 9 km SSE of Harrison, Montana
  10. 2.0 18 km SW of Amsterdam, Montana
  11. 1.7 3 km WNW of Manhattan, Montana
  12. 2.2 2 km WSW of Manhattan, Montana
  13. 1.5 2 km WNW of Manhattan, Montana
  14. 2.5 3 km W of Manhattan, Montana
  15. 2.3 1 km W 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.0 on 2019-07-14 — it released about 2,000 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.