QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

40 km ENE of Condon, Montana

Yes. A magnitude 1.6 earthquake was recorded 40 km ENE of Condon, Montana, at 1:28 am MDT on 30 August 2025 (07:28 UTC), 7.6 km deep.

· 7.6 km deep · released about 6.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 67 kmTeton County 72 kmLewis and Clark County 81 kmMissoula County 83 kmPowell County 87 kmPondera County 100 kmFlathead 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
Montana today
every earthquake in Montana in the last 24 hours
Magnitude
M 1.6 (ml)
Depth
7.6 km below the surface
Felt
no reports yet
Nearest
Lake County, 67 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 438 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 6.6 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 2,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.6 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 47.6053, -113.1868. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lake County, MT 67 km (42 mi) W earthquakes near Lake County
Teton County, MT 72 km (45 mi) ENE earthquakes near Teton County
Lewis and Clark County, MT 81 km (50 mi) SE earthquakes near Lewis and Clark County
Missoula County, MT 83 km (52 mi) SW earthquakes near Missoula County
Powell County, MT 87 km (54 mi) SSE earthquakes near Powell County
Pondera County, MT 100 km (62 mi) NE earthquakes near Pondera County

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

Aftershocks so far

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

  1. 1.0 22 km N of Ovando, Montana
  2. 2.3 22 km N of Ovando, Montana
  3. 1.6 28 km WSW of Augusta, Montana
  4. 1.1 27 km ENE of Seeley Lake, Montana
  5. 1.4 38 km NNE of Ovando, Montana
  6. 1.3 41 km WSW of Augusta, Montana
  7. 0.9 15 km SE of Condon, Montana
  8. 3.2 3 km NE of Seeley Lake, Montana
  9. 2.4 32 km ENE of Seeley Lake, Montana
  10. 2.6 31 km ENE of Seeley Lake, Montana
  11. 2.1 25 km ENE of Seeley Lake, Montana
  12. 1.9 15 km N of Seeley Lake, Montana
  13. 3.1 27 km NE of Seeley Lake, Montana
  14. 1.5 40 km NE of Seeley Lake, Montana
  15. 2.2 40 km NE of Seeley Lake, Montana

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.