QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

0 km NW of Eureka, Montana

· 7.7 km deep · released about 5.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lincoln County 47 kmFlathead County 99 kmBoundary County 108 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
7.7 km below the surface
Felt
no reports yet
Nearest
Lincoln County, 47 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2495 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 5.6 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 2,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.6 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 48.8848, -115.0597. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lincoln County, MT 47 km (29 mi) NE of here earthquakes near Lincoln County
Flathead County, MT 99 km (61 mi) NW of here earthquakes near Flathead County
Boundary County, ID 108 km (67 mi) E of here earthquakes near Boundary County
Bonner County, ID 131 km (81 mi) ENE of here earthquakes near Bonner County

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

Aftershocks so far

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

  1. 2.3 6 km NNE of Olney, Montana
  2. 2.2 19 km E of Indian Springs, Montana
  3. 1.8 20 km NW of West Kootenai, Montana
  4. 1.9 19 km NE of Indian Springs, Montana
  5. 1.5 30 km NE of Indian Springs, Montana
  6. 3.2 19 km ENE of Stryker, Montana
  7. 2.6 14 km NNE of Fortine, Montana
  8. 2.1 5 km NNE of Olney, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.