QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

14 km N of Marysville, Montana

· 11 km deep · released about 7.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis and Clark County 28 kmPowell County 49 kmBroadwater County 86 kmJefferson County 86 kmCascade County 86 kmGranite County 102 kmTeton County 105 kmMeagher County 109 kmDeer Lodge 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 1.6 (ml)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Lewis and Clark County, 28 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1020 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 7.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.1 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 46.8780, -112.2830. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis and Clark County, MT 28 km (18 mi) SSE of here earthquakes near Lewis and Clark County
Powell County, MT 49 km (31 mi) E of here earthquakes near Powell County
Broadwater County, MT 86 km (53 mi) NW of here earthquakes near Broadwater County
Jefferson County, MT 86 km (53 mi) NNW of here earthquakes near Jefferson County
Cascade County, MT 86 km (53 mi) SW of here earthquakes near Cascade County
Granite County, MT 102 km (64 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

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

  1. 2.1 17 km S of Lincoln, Montana
  2. 1.5 17 km E of Lincoln, Montana
  3. 1.6 18 km E of Lincoln, Montana
  4. 1.5 15 km SE of Lincoln, Montana
  5. 1.5 3 km SE of Helena Valley West Central, Montana
  6. 1.6 6 km SE of Craig, Montana
  7. 1.7 7 km SSE of Lincoln, Montana
  8. 2.3 10 km SSE of Marysville, Montana
  9. 2.1 15 km E of Lincoln, Montana
  10. 2.5 23 km SSE of Craig, Montana
  11. 1.9 23 km SSE of Craig, Montana
  12. 2.7 3 km ENE of Helena, Montana
  13. 1.8 3 km E of Helena, Montana
  14. 1.6 13 km ESE of Lincoln, Montana
  15. 2.1 22 km NNE of Helena Valley Northeast, 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 2,100,000 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.