Earthquake · reviewed by a seismologist
M 1.7ml
25 km E of Leadore, Idaho
Yes. A magnitude 1.7 earthquake was recorded 25 km E of Leadore, Idaho, at 3:21 am MST on 21 February 2025 (10:21 UTC), 4.1 km deep.
- When
- Idaho today
- every earthquake in Idaho in the last 24 hours
- Magnitude
- M 1.7 (ml)
- Depth
- 4.1 km below the surface
- Felt
- no reports yet
- Nearest
- Beaverhead County, 53 km NNE
- Nearest mapped fault
- Beaverhead 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 628 days ago
Earthquake alerts for Dillon, MT
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
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 12 km (7 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 12 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.
- Mineral, Virginia 2011 M 5.8 1,300,000× the energy of this one
- Magna, Utah 2020 M 5.7 900,000× the energy of this one
- Around the size people start to feel M 3.0 80× the energy of this one
- This earthquake M 1.7 about 12 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 4.6 on 2019-04-09 — about 20,000 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 5.1 19 km NW of Lima, Montana · 26 km ENE of this epicentre
- 5.1 22 km NW of Lima, Montana · 24 km NE 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 44.6650, -113.0350. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Beaverhead County, MT | 53 km (33 mi) | NNE | earthquakes near Beaverhead County |
| Clark County, ID | 68 km (42 mi) | SE | earthquakes near Clark County |
| Lemhi County, ID | 73 km (46 mi) | WNW | earthquakes near Lemhi County |
| Custer County, ID | 106 km (66 mi) | WSW | earthquakes near Custer County |
| Butte County, ID | 110 km (68 mi) | S | earthquakes near Butte County |
| Jefferson County, ID | 112 km (70 mi) | SSE | earthquakes near Jefferson County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
21 earthquakes have been recorded within 50 km since this one.
- 1.3 35 km NW of Lima, Montana
- 1.7 33 km NW of Lima, Montana
- 1.3 1 km WSW of Lima, Montana
- 1.0 3 km NW of Lima, Montana
- 3.3 18 km S of Lima, Montana
- 1.7 2 km SW of Lima, Montana
- 3.2 18 km N of Leadore, Idaho
- 1.8 26 km S of Lima, Montana
- 1.7 32 km S of Lima, Montana
- 2.1 2 km SSE of Lima, Montana
- 1.8 27 km SW of Dillon, Montana
- 1.6 19 km NW of Lima, Montana
- 1.7 33 km NW of Lima, Montana
- 1.8 34 km NW of Lima, Montana
- 1.8 33 km NW of Lima, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.