QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7mb_lg

17 km NNW of Santa Rita, Montana

· 10 km deep · released about 340 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glacier County 43 kmToole County 56 kmPondera County 69 kmLiberty County 108 kmTeton 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 2.7 (mb_lg)
Depth
10 km below the surface
Felt
1 report · strongest reported intensity I
Measured shaking
intensity III (ShakeMap)
Nearest
Glacier County, 43 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 832 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 48.8344, -112.4422. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glacier County, MT 43 km (27 mi) ENE of here earthquakes near Glacier County
Toole County, MT 56 km (35 mi) WNW of here earthquakes near Toole County
Pondera County, MT 69 km (43 mi) NNW of here earthquakes near Pondera County
Liberty County, MT 108 km (67 mi) WNW of here earthquakes near Liberty County
Teton County, MT 114 km (71 mi) N of here earthquakes near Teton County
Flathead County, MT 133 km (82 mi) ENE of here earthquakes near Flathead County

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

Aftershocks so far

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

  1. 2.3 40 km SSE of Magrath, Canada
  2. 1.5 12 km WSW of Sunburst, Montana
  3. 1.6 9 km ESE of Cut Bank, Montana
  4. 2.0 43 km NNW of Santa Rita, Montana
  5. 2.4 38 km NNW of Santa Rita, Montana
  6. 1.9 40 km SSE of Magrath, Canada
  7. 1.5 20 km NW of Santa Rita, 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.