QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

7 km NE of Marysville, Montana

· 13 km deep · released about 98 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis and Clark County 38 kmPowell County 54 kmJefferson County 76 kmBroadwater County 76 kmCascade County 88 kmGranite County 102 kmMeagher County 102 kmDeer Lodge County 105 kmSilver Bow County 106 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 2.3 (ml)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Lewis and Clark County, 38 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3734 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 98 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 150,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 110,000× the energy of this one
  3. Around the size people start to feel M 3.0 9.8× the energy of this one
  4. This earthquake M 2.3 about 98 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 46.7972, -112.2250. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis and Clark County, MT 38 km (24 mi) SSE of here earthquakes near Lewis and Clark County
Powell County, MT 54 km (34 mi) E of here earthquakes near Powell County
Jefferson County, MT 76 km (47 mi) N of here earthquakes near Jefferson County
Broadwater County, MT 76 km (47 mi) NW of here earthquakes near Broadwater County
Cascade County, MT 88 km (55 mi) SW of here earthquakes near Cascade County
Granite County, MT 102 km (63 mi) ENE of here earthquakes near Granite County

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

Aftershocks so far

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

  1. 2.2 14 km ESE of Lincoln, Montana
  2. 2.4 13 km SE of Lincoln, Montana
  3. 2.3 14 km ESE of Lincoln, Montana
  4. 3.7 12 km ESE of Lincoln, Montana
  5. 2.3 12 km SE of Lincoln, Montana
  6. 2.5 13 km WNW of Marysville, Montana
  7. 3.3 12 km SE of Lincoln, Montana
  8. 2.3 13 km SE of Lincoln, Montana
  9. 2.6 11 km SSE of Lincoln, Montana
  10. 3.2 14 km ESE of Lincoln, Montana
  11. 2.7 Western Montana
  12. 3.3 9 km SE of Lincoln, Montana
  13. 2.4 13 km SE of Lincoln, Montana
  14. 2.5 11 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 4.3 on 2016-01-30 — it released about 970 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.