QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

19 km NW of Craig, Montana

· 10 km deep · released about 8.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lewis and Clark County 21 kmCascade County 60 kmTeton County 69 kmPowell County 73 kmBroadwater County 108 kmPondera County 114 kmMeagher County 115 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
Lewis and Clark County, 21 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3141 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 8.7 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 8.7 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 47.2033, -112.1282. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lewis and Clark County, MT 21 km (13 mi) ENE of here earthquakes near Lewis and Clark County
Cascade County, MT 60 km (37 mi) WSW of here earthquakes near Cascade County
Teton County, MT 69 km (43 mi) S of here earthquakes near Teton County
Powell County, MT 73 km (45 mi) ENE of here earthquakes near Powell County
Broadwater County, MT 108 km (67 mi) NNW of here earthquakes near Broadwater County
Pondera County, MT 114 km (71 mi) S of here earthquakes near Pondera 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. 1.9 14 km SE of Lincoln, Montana
  2. 1.8 16 km SE of Lincoln, Montana
  3. 1.7 14 km SE of Lincoln, Montana
  4. 1.5 15 km SE of Lincoln, Montana
  5. 2.8 14 km SE of Lincoln, Montana
  6. 2.4 14 km ESE of Lincoln, Montana
  7. 1.7 16 km SE of Lincoln, Montana
  8. 1.6 15 km SE of Lincoln, Montana
  9. 2.3 11 km ESE of Lincoln, Montana
  10. 1.6 15 km SE of Lincoln, Montana
  11. 1.7 14 km SE of Lincoln, Montana
  12. 1.6 15 km SE of Lincoln, Montana
  13. 1.5 14 km SE of Lincoln, Montana
  14. 1.5 14 km SE of Lincoln, Montana
  15. 1.5 14 km SE of Lincoln, 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 1,700,000 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.