QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

6 km E of Avon, Montana

· 11 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Powell County 42 kmLewis and Clark County 58 kmJefferson County 64 kmGranite County 74 kmDeer Lodge County 74 kmSilver Bow County 80 kmBroadwater County 84 kmMissoula County 115 kmCascade County 119 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
11 km below the surface
Felt
no reports yet
Nearest
Powell County, 42 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 385 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 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 46.6048, -112.5130. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Powell County, MT 42 km (26 mi) SE of here earthquakes near Powell County
Lewis and Clark County, MT 58 km (36 mi) S of here earthquakes near Lewis and Clark County
Jefferson County, MT 64 km (40 mi) NNW of here earthquakes near Jefferson County
Granite County, MT 74 km (46 mi) ENE of here earthquakes near Granite County
Deer Lodge County, MT 74 km (46 mi) NE of here earthquakes near Deer Lodge County
Silver Bow County, MT 80 km (49 mi) N of here earthquakes near Silver Bow County

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

Aftershocks so far

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

  1. 1.5 1 km SSE of South Hills, Montana
  2. 1.7 0 km NNW of South Hills, Montana
  3. 1.7 8 km S of Marysville, Montana
  4. 1.7 13 km SE of Lincoln, Montana
  5. 1.9 1 km SSE of South Hills, Montana
  6. 1.7 16 km W of Lincoln, Montana
  7. 2.4 7 km SSE of Lincoln, Montana
  8. 2.0 7 km SSE of Lincoln, Montana
  9. 1.5 14 km SE of Lincoln, Montana
  10. 1.8 19 km S of Lincoln, Montana
  11. 1.9 7 km S of Lincoln, Montana
  12. 1.8 19 km NNW of Avon, Montana
  13. 2.8 19 km S of Lincoln, Montana
  14. 1.6 14 km ESE of Lincoln, Montana
  15. 2.2 19 km S of Lincoln, 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 5.8 on 2017-07-06 — it released about 2,800,000 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.