QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

14 km NNW of Stanley, Idaho

Yes. A magnitude 1.6 earthquake was recorded 14 km NNW of Stanley, Idaho, at 12:02 am MDT on 27 May 2025 (06:02 UTC), 8.1 km deep.

· 8.1 km deep · released about 7.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Custer County 62 kmBoise County 67 kmValley County 75 kmCamas County 95 kmElmore County 111 kmLemhi County 111 kmGem County 114 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 1.6 (ml)
Depth
8.1 km below the surface
Felt
no reports yet
Nearest
Custer County, 62 km E
Nearest mapped fault
Sawtooth fault, 12 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 532 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 8 km (5 mi) from the epicentre. 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 7.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 7.8 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 22,000,000 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 · 27 km NNE of this epicentre
  2. 6.0 44 km NNW of Stanley, Idaho · 31 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 44.3355, -115.0227. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Custer County, ID 62 km (38 mi) E earthquakes near Custer County
Boise County, ID 67 km (42 mi) SW earthquakes near Boise County
Valley County, ID 75 km (46 mi) NW earthquakes near Valley County
Camas County, ID 95 km (59 mi) SSE earthquakes near Camas County
Elmore County, ID 111 km (69 mi) SSW earthquakes near Elmore County
Lemhi County, ID 111 km (69 mi) NE earthquakes near Lemhi 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. 3.6 15 km NNW of Stanley, Idaho
  2. 3.6 14 km NNW of Stanley, Idaho
  3. 2.6 13 km NNW of Stanley, Idaho
  4. 2.3 14 km NNW of Stanley, Idaho
  5. 2.3 14 km NNW of Stanley, Idaho
  6. 2.0 14 km NNW of Stanley, Idaho
  7. 1.9 15 km NNW of Stanley, Idaho
  8. 2.2 13 km NNW of Stanley, Idaho
  9. 2.0 13 km NNW of Stanley, Idaho
  10. 2.2 13 km NNW of Stanley, Idaho
  11. 3.0 15 km NW of Stanley, Idaho
  12. 2.3 13 km NNW of Stanley, Idaho
  13. 1.6 14 km NNW of Stanley, Idaho
  14. 2.3 13 km NNW of Stanley, Idaho
  15. 1.7 15 km NNW 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.