QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

21 km SE of Cascade, Idaho

· 7.0 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Boise County 47 kmValley County 53 kmGem County 60 kmAdams County 73 kmWashington County 78 kmPayette County 87 kmAda County 111 kmCanyon County 112 kmElmore 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 2.1 (ml)
Depth
7.0 km below the surface
Felt
no reports yet
Nearest
Boise County, 47 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 348 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 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 44.4022, -115.8185. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Boise County, ID 47 km (29 mi) N of here earthquakes near Boise County
Valley County, ID 53 km (33 mi) SSW of here earthquakes near Valley County
Gem County, ID 60 km (37 mi) NE of here earthquakes near Gem County
Adams County, ID 73 km (46 mi) SE of here earthquakes near Adams County
Washington County, ID 78 km (48 mi) E of here earthquakes near Washington County
Payette County, ID 87 km (54 mi) ENE of here earthquakes near Payette 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. 2.9 30 km N of Lowman, Idaho
  2. 2.7 28 km N of Lowman, Idaho
  3. 1.6 30 km N of Lowman, Idaho
  4. 1.7 12 km WNW of Cascade, Idaho
  5. 1.8 6 km N of Smiths Ferry, Idaho
  6. 2.8 20 km SE of Cascade, Idaho
  7. 2.0 7 km NNW of Smiths Ferry, 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 4.9 on 2024-02-26 — it released about 14,000 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.