QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

16 km NNW of Marysville, Montana

· 10 km deep · released about 170 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis and Clark County 25 kmPowell County 45 kmJefferson County 88 kmCascade County 89 kmBroadwater County 90 kmGranite County 99 kmTeton County 103 kmDeer Lodge County 108 kmSilver Bow County 114 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 2.5 (ml)
Depth
10 km below the surface
Felt
5 reports · strongest reported intensity III
Nearest
Lewis and Clark County, 25 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2994 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 46.8942, -112.3456. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis and Clark County, MT 25 km (16 mi) S of here earthquakes near Lewis and Clark County
Powell County, MT 45 km (28 mi) E of here earthquakes near Powell County
Jefferson County, MT 88 km (55 mi) NNW of here earthquakes near Jefferson County
Cascade County, MT 89 km (55 mi) WSW of here earthquakes near Cascade County
Broadwater County, MT 90 km (56 mi) NW of here earthquakes near Broadwater County
Granite County, MT 99 km (62 mi) NE of here earthquakes near Granite 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. 1.5 4 km SSE of Lincoln, Montana
  2. 1.6 15 km SE of Lincoln, Montana
  3. 2.1 15 km SSE of Craig, Montana
  4. 1.8 14 km SSE of Craig, Montana
  5. 1.7 15 km SE of Lincoln, Montana
  6. 2.0 15 km SE of Lincoln, Montana
  7. 2.4 13 km ESE of Lincoln, Montana
  8. 1.6 13 km SE of Lincoln, Montana
  9. 2.0 13 km ESE of Lincoln, Montana
  10. 2.2 13 km SE of Lincoln, Montana
  11. 1.8 13 km ESE of Lincoln, Montana
  12. 1.7 13 km SE of Lincoln, Montana
  13. 1.9 14 km SE of Lincoln, Montana
  14. 1.8 15 km SE of Lincoln, Montana
  15. 1.5 15 km SE 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 89,000 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.