QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

54 km NE of Mackay, Idaho

· 10 km deep · released about 1.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Clark County 57 kmButte County 58 kmJefferson County 74 kmCuster County 96 kmLemhi County 104 kmBeaverhead County 105 kmBlaine 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 3.3 (ml)
Depth
10 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Clark County, 57 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 443 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 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.8× more

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 44.2010, -113.0566. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Clark County, ID 57 km (35 mi) W of here earthquakes near Clark County
Butte County, ID 58 km (36 mi) N of here earthquakes near Butte County
Jefferson County, ID 74 km (46 mi) NW of here earthquakes near Jefferson County
Custer County, ID 96 km (59 mi) E of here earthquakes near Custer County
Lemhi County, ID 104 km (65 mi) SE of here earthquakes near Lemhi County
Beaverhead County, MT 105 km (65 mi) S of here earthquakes near Beaverhead County

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

Aftershocks so far

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

  1. 3.3 18 km S of Lima, Montana
  2. 1.8 26 km S of Lima, Montana
  3. 1.7 32 km S of Lima, Montana
  4. 1.6 26 km N of Mackay, 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.

On USGS

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