QuakeIndex

explosion · reviewed by a seismologist

M 1.8md

15 km NW of Ponderay, Idaho

· -0.7 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Bonner County 9 kmBoundary County 43 kmPend Oreille County 44 kmKootenai County 80 kmStevens County 86 kmLincoln County 92 kmSpokane County 102 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 (md)
Depth
-0.7 km below the surface
Felt
no reports yet
Nearest
Bonner County, 9 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 817 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 48.3975, -116.6845. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Bonner County, ID 9 km (6 mi) NNW of here earthquakes near Bonner County
Boundary County, ID 43 km (27 mi) SSW of here earthquakes near Boundary County
Pend Oreille County, WA 44 km (27 mi) ESE of here earthquakes near Pend Oreille County
Kootenai County, ID 80 km (50 mi) N of here earthquakes near Kootenai County
Stevens County, WA 86 km (54 mi) E of here earthquakes near Stevens County
Lincoln County, MT 92 km (57 mi) W of here earthquakes near Lincoln County

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

Aftershocks so far

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

  1. 2.3 2 km NE of Dover, Idaho
  2. 2.2 8 km WNW of Dover, Idaho
  3. 1.5 36 km E of Metaline Falls, Washington
  4. 1.7 9 km WSW of Newport, Washington
  5. 1.6 13 km NNW of Athol, Idaho
  6. 1.9 6 km NNW of Priest River, Idaho
  7. 2.1 12 km NNW of Kootenai, Idaho
  8. 1.6 11 km NNW of Kootenai, Idaho
  9. 2.1 7 km WSW of Clark Fork, Idaho
  10. 1.6 18 km N of Kootenai, Idaho
  11. 2.2 8 km NW of Ponderay, Idaho
  12. 1.8 13 km SSW of East Hope, Idaho
  13. 2.1 8 km WNW of Dover, Idaho
  14. 1.8 9 km NNW of Ponderay, Idaho
  15. 1.5 11 km SSW of East Hope, 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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