QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

15 km NNE of Avon, Montana

· 6.9 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Powell County 31 kmLewis and Clark County 45 kmGranite County 77 kmJefferson County 78 kmDeer Lodge County 84 kmBroadwater County 92 kmSilver Bow County 93 kmMissoula County 107 kmCascade 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
6.9 km below the surface
Felt
no reports yet
Nearest
Powell County, 31 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2850 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 5.9 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 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 46.7338, -112.5548. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Powell County, MT 31 km (19 mi) ESE of here earthquakes near Powell County
Lewis and Clark County, MT 45 km (28 mi) SSW of here earthquakes near Lewis and Clark County
Granite County, MT 77 km (48 mi) ENE of here earthquakes near Granite County
Jefferson County, MT 78 km (48 mi) NNW of here earthquakes near Jefferson County
Deer Lodge County, MT 84 km (52 mi) NNE of here earthquakes near Deer Lodge County
Broadwater County, MT 92 km (57 mi) WNW of here earthquakes near Broadwater County

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

Aftershocks so far

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

  1. 1.6 11 km ESE of Lincoln, Montana
  2. 2.0 12 km ESE of Lincoln, Montana
  3. 1.6 Western Montana
  4. 2.3 7 km SSE of Lincoln, Montana
  5. 1.6 18 km NW of Marysville, Montana
  6. 1.8 12 km ESE of Lincoln, Montana
  7. 2.3 Western Montana
  8. 1.6 7 km SSE of Lincoln, Montana
  9. 1.9 15 km SE of Lincoln, Montana
  10. 1.6 18 km SSW of Lincoln, Montana
  11. 1.9 14 km SE of Lincoln, Montana
  12. 1.7 11 km ESE of Lincoln, Montana
  13. 1.8 11 km ESE of Lincoln, Montana
  14. 1.6 6 km SSE of Lincoln, Montana
  15. 2.4 11 km ESE 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 2,500,000 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.