QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

19 km W of Stanley, Idaho

Yes. A magnitude 1.7 earthquake was recorded 19 km W of Stanley, Idaho, at 1:19 am MDT on 5 August 2023 (07:19 UTC), 15 km deep.

· 15 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Boise County 52 kmCuster County 74 kmValley County 77 kmCamas County 89 kmElmore County 97 kmGem County 100 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
Idaho today
every earthquake in Idaho in the last 24 hours
Magnitude
M 1.7 (ml)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Boise County, 52 km WSW
Nearest mapped fault
Sawtooth fault, 4 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1192 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

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 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 930,000× the energy of this one
  3. Around the size people start to feel M 3.0 83× 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

The largest earthquake within 50 km since 2016 was M 6.5 on 2020-03-31 — about 15,000,000 times the energy of this one.

Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:

  1. 6.1 37 km N of Stanley, Idaho · 41 km NNE of this epicentre
  2. 6.0 44 km NNW of Stanley, Idaho · 41 km N of this epicentre

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 44.2437, -115.1767. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Boise County, ID 52 km (32 mi) WSW earthquakes near Boise County
Custer County, ID 74 km (46 mi) E earthquakes near Custer County
Valley County, ID 77 km (48 mi) NNW earthquakes near Valley County
Camas County, ID 89 km (55 mi) SSE earthquakes near Camas County
Elmore County, ID 97 km (60 mi) SSW earthquakes near Elmore County
Gem County, ID 100 km (62 mi) WSW earthquakes near Gem County

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

Aftershocks so far

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

  1. 2.9 11 km W of Stanley, Idaho
  2. 1.7 13 km W of Stanley, Idaho
  3. 2.4 14 km W of Stanley, Idaho
  4. 2.1 12 km W of Stanley, Idaho
  5. 2.0 39 km NW of Stanley, Idaho
  6. 2.5 11 km NE of Stanley, Idaho
  7. 1.6 17 km NW of Stanley, Idaho
  8. 1.6 16 km NW of Stanley, Idaho
  9. 1.8 southern Idaho
  10. 1.9 30 km NW of Stanley, Idaho
  11. 1.5 15 km SW of Stanley, Idaho
  12. 1.8 21 km WNW of Stanley, Idaho
  13. 2.2 southern Idaho
  14. 1.7 33 km NW of Stanley, Idaho
  15. 2.4 34 km NW of Stanley, 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.