QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

2 km NNW of Ovando, Montana

· 21 km deep · released about 1,900 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Powell County 27 kmMissoula County 56 kmLewis and Clark County 59 kmGranite County 75 kmLake County 97 kmDeer Lodge County 105 kmTeton County 109 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 3.2 (ml)
Depth
21 km below the surface
Felt
4 reports · strongest reported intensity III
Nearest
Powell County, 27 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2670 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2× more

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 47.0383, -113.1483. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Powell County, MT 27 km (17 mi) NW of here earthquakes near Powell County
Missoula County, MT 56 km (35 mi) E of here earthquakes near Missoula County
Lewis and Clark County, MT 59 km (36 mi) W of here earthquakes near Lewis and Clark County
Granite County, MT 75 km (46 mi) NNE of here earthquakes near Granite County
Lake County, MT 97 km (61 mi) SE of here earthquakes near Lake County
Deer Lodge County, MT 105 km (65 mi) N of here earthquakes near Deer Lodge County

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

Aftershocks so far

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

  1. 1.8 16 km NNE of Seeley Lake, Montana
  2. 2.4 32 km WSW of Augusta, Montana
  3. 1.6 38 km WSW of Augusta, Montana
  4. 1.8 15 km W of Drummond, Montana
  5. 1.7 15 km W of Drummond, Montana
  6. 2.0 Western Montana
  7. 1.6 3 km WNW of Lincoln, Montana
  8. 2.3 19 km NNE of Seeley Lake, Montana
  9. 2.8 6 km WNW of Lincoln, Montana
  10. 2.3 Western Montana
  11. 1.8 11 km W of Lincoln, Montana
  12. 2.3 13 km WNW of Lincoln, Montana
  13. 2.5 18 km N of Ovando, Montana
  14. 2.0 7 km SSE of Lincoln, Montana
  15. 2.3 7 km SSE 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 5.0 on 2017-07-06 — it released about 500 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.