QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

8 km W of Troy, Idaho

· -0.9 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Latah County 15 kmNez Perce County 45 kmWhitman County 54 kmBenewah County 57 kmGarfield County 61 kmLewis County 65 kmAsotin County 67 kmColumbia County 93 kmClearwater County 94 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 1.8 (ml)
Depth
-0.9 km below the surface
Felt
no reports yet
Nearest
Latah County, 15 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 467 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 46.7322, -116.8773. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Latah County, ID 15 km (9 mi) SW of here earthquakes near Latah County
Nez Perce County, ID 45 km (28 mi) NNW of here earthquakes near Nez Perce County
Whitman County, WA 54 km (33 mi) ESE of here earthquakes near Whitman County
Benewah County, ID 57 km (36 mi) SSW of here earthquakes near Benewah County
Garfield County, WA 61 km (38 mi) NE of here earthquakes near Garfield County
Lewis County, ID 65 km (40 mi) NNW of here earthquakes near Lewis County

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

Aftershocks so far

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

  1. 2.3 1 km NW of Asotin, Washington
  2. 2.1 5 km ENE of Pullman, Washington
  3. 2.3 9 km ESE of Princeton, Idaho
  4. 1.7 4 km E of Uniontown, Washington
  5. 2.3 4 km ENE of Pullman, Washington
  6. 2.3 5 km SSW of Moscow, Idaho
  7. 1.7 6 km WSW of Troy, Idaho
  8. 1.6 8 km SSE of Pullman, Washington
  9. 2.1 2 km SSE of Lewiston Orchards, Idaho
  10. 2.2 8 km SW of Potlatch, Idaho
  11. 2.2 2 km NE of Lewiston Orchards, Idaho
  12. 1.8 14 km E of Pomeroy, Washington
  13. 1.6 10 km ESE of Moscow, Idaho
  14. 1.9 7 km WSW of Deary, Idaho
  15. 1.9 7 km ENE of Troy, 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

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