QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

4 km ESE of Evergreen, MT

· 10 km deep · released about 9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Flathead County 21 kmLake County 69 kmSanders County 83 kmLincoln County 91 kmGlacier County 111 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
10 km below the surface
Felt
no reports yet
Nearest
Flathead County, 21 km ENE
Nearest mapped fault
Mission fault, 9 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3073 days ago

A magnitude 1.6 earthquake was recorded 4 km ESE of Evergreen, MT at 06:32 UTC on 2018-05-04. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Evergreen, Kalispell, Columbia Falls, Somers, Whitefish, Lakeside.

How big was it?

This earthquake released about 9 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 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 9 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 48.2385, -114.3208. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Flathead County, MT 21 km (13 mi) ENE earthquakes near Flathead County
Lake County, MT 69 km (43 mi) SSE earthquakes near Lake County
Sanders County, MT 83 km (52 mi) SW earthquakes near Sanders County
Lincoln County, MT 91 km (57 mi) WNW earthquakes near Lincoln County
Glacier County, MT 111 km (69 mi) ENE earthquakes near Glacier County
Shoshone County, ID 153 km (95 mi) SW earthquakes near Shoshone County

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

Aftershocks so far

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

  1. 1.8 12 km NE of Forest Hill Village, Montana
  2. 1.9 12 km ESE of Evergreen, Montana
  3. 1.6 6 km SW of Woods Bay, Montana
  4. 1.7 1 km S of Woods Bay, Montana
  5. 2.1 6 km SW of Woods Bay, Montana
  6. 1.6 6 km SW of Woods Bay, Montana
  7. 2.2 7 km WNW of Lake Mary Ronan, Montana
  8. 1.7 7 km WNW of Lake Mary Ronan, Montana
  9. 1.8 6 km WNW of Lake Mary Ronan, Montana
  10. 2.3 6 km NNE of Olney, Montana
  11. 2.3 10 km NNW of Swan Lake, Montana
  12. 1.7 15 km NNE of Bigfork, Montana
  13. 1.7 5 km ESE of Lakeside, Montana
  14. 1.5 8 km ESE of Woods Bay, Montana
  15. 1.6 3 km NNE of Somers, 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.