QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

36 km N of Spencer, Idaho

· 5.6 km deep · released about 7.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 48 kmFremont County 72 kmMadison County 73 kmBeaverhead County 79 kmJefferson County 100 kmMadison County 106 kmGallatin County 119 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
5.6 km below the surface
Felt
no reports yet
Nearest
Clark County, 48 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2193 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 7.8 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 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 7.8 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 44.6862, -112.1112. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, ID 48 km (30 mi) NNE of here earthquakes near Clark County
Fremont County, ID 72 km (45 mi) NW of here earthquakes near Fremont County
Madison County, MT 73 km (45 mi) SSW of here earthquakes near Madison County
Beaverhead County, MT 79 km (49 mi) SE of here earthquakes near Beaverhead County
Jefferson County, ID 100 km (62 mi) N of here earthquakes near Jefferson County
Madison County, ID 106 km (66 mi) NNW of here earthquakes near Madison County

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

Aftershocks so far

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

  1. 1.6 42 km NE of Spencer, Idaho
  2. 1.7 30 km NNE of Spencer, Idaho
  3. 2.3 34 km S of Virginia City, Montana
  4. 1.5 37 km NE of Spencer, Idaho
  5. 1.5 7 km ENE of Lima, Montana
  6. 2.9 6 km ENE of Lima, Montana
  7. 1.5 9 km ENE of Lima, Montana
  8. 1.6 41 km S of Virginia City, Montana
  9. 1.6 Idaho-Montana border region
  10. 1.7 31 km N of Spencer, Idaho
  11. 1.6 Idaho-Montana border region
  12. 1.6 10 km ESE of Lima, Montana
  13. 1.7 42 km NNE of Spencer, Idaho
  14. 1.9 32 km N of Spencer, Idaho
  15. 2.0 28 km N of Spencer, Idaho

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 4.6 on 2019-04-09 — it released about 31,000 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.