QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

11 km NNE of Ennis, Montana

· 4.2 km deep · released about 7.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Madison County 23 kmGallatin County 40 kmJefferson County 82 kmPark County 88 kmSilver Bow County 92 kmBroadwater County 100 kmBeaverhead County 102 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 1.6 (ml)
Depth
4.2 km below the surface
Felt
no reports yet
Nearest
Madison County, 23 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1436 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 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 45.4413, -111.6652. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Madison County, MT 23 km (14 mi) ENE of here earthquakes near Madison County
Gallatin County, MT 40 km (25 mi) WSW of here earthquakes near Gallatin County
Jefferson County, MT 82 km (51 mi) SSE of here earthquakes near Jefferson County
Park County, MT 88 km (55 mi) W of here earthquakes near Park County
Silver Bow County, MT 92 km (57 mi) ESE of here earthquakes near Silver Bow County
Broadwater County, MT 100 km (62 mi) S of here earthquakes near Broadwater 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. 2.0 2 km NNW of Pony, Montana
  2. 1.9 31 km SSE of Virginia City, Montana
  3. 1.6 29 km SSE of Virginia City, Montana
  4. 2.4 8 km SSE of Pony, Montana
  5. 1.5 28 km SE of Virginia City, Montana
  6. 1.5 28 km S of Ennis, Montana
  7. 2.4 7 km NW of Willow Creek, Montana
  8. 2.0 7 km SE of Pony, Montana
  9. 1.5 29 km SE of Virginia City, Montana
  10. 1.6 28 km S of Ennis, Montana
  11. 1.5 28 km SE of Virginia City, Montana
  12. 1.5 18 km W of Pony, Montana
  13. 2.5 13 km SSE of Harrison, Montana
  14. 1.5 11 km N of Ennis, Montana
  15. 1.5 15 km SSE 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 4.0 on 2016-09-03 — it released about 4,400 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.