QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near Sandpoint, ID

USGS: 9 km SE of Sandpoint, Idaho

94 km (58 mi) NE of Spokane, WA

12:24 am PDT, Sep 30, 2021 · · 5.0 km deep · released about 11 lb of TNT

Every earthquake near Sandpoint Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Bonner County 17 kmKootenai County 61 kmBoundary County 63 kmPend Oreille County 68 kmLincoln County 84 kmSpokane County 95 kmStevens County 104 kmShoshone County 105 kmSanders County 108 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
12:24 am PDT on 30 September 2021 ()
Where
10 km (6 mi) SE of Sandpoint, ID · earthquakes near Sandpoint
Magnitude
M 1.7 (ml)
Depth
5.0 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Bonner County, 17 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1764 days ago

A magnitude 1.7 earthquake was recorded 10 km (6 mi) SE of Sandpoint, ID, at 12:24 am PDT on 30 September 2021 (07:24 UTC). 2 people have reported feeling it to USGS. This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

Earthquakes near other towns within 30 km: Ponderay.

How big was it?

This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 48.2080, -116.4706. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Bonner County, ID 17 km (11 mi) NW earthquakes near Bonner County
Kootenai County, ID 61 km (38 mi) SSW earthquakes near Kootenai County
Boundary County, ID 63 km (39 mi) N earthquakes near Boundary County
Pend Oreille County, WA 68 km (42 mi) NW earthquakes near Pend Oreille County
Lincoln County, MT 84 km (52 mi) ENE earthquakes near Lincoln County
Spokane County, WA 95 km (59 mi) SW earthquakes near Spokane County

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

Aftershocks so far

37 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. 1.8 6 km SSW of Athol, Idaho
  4. 1.6 13 km NNW of Athol, Idaho
  5. 1.9 6 km NNW of Priest River, Idaho
  6. 2.1 12 km NNW of Kootenai, Idaho
  7. 1.6 11 km NNW of Kootenai, Idaho
  8. 2.1 7 km WSW of Clark Fork, Idaho
  9. 1.6 18 km N of Kootenai, Idaho
  10. 2.2 8 km NW of Ponderay, Idaho
  11. 1.8 13 km SSW of East Hope, Idaho
  12. 2.1 8 km WNW of Dover, Idaho
  13. 1.8 9 km NNW of Ponderay, Idaho
  14. 1.5 11 km SSW of East Hope, Idaho
  15. 2.5 10 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

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