Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Challis, ID
No earthquake was likely felt in Challis in the 24 hours to 7:55 pm MST (02:55 UTC). The last one was M 2.0, 9 km (6 mi) SSW, at 1:32 am MDT on 17 August 2026, estimated intensity II (weak) in town. Every earthquake near Challis
This page: a magnitude 1.7 earthquake was recorded 19 km (12 mi) north-northwest of Challis, ID, at 10:05 pm MST on 2 March 2025 (05:05 UTC), 8.3 km deep.
USGS: 19 km NNW of Challis, Idaho
- When
- 10:05 pm MST on 2 March 2025 ()
- Where
- 19 km (12 mi) north-northwest of Challis, ID · earthquakes near Challis
- Idaho today
- every earthquake in Idaho in the last 24 hours
- Magnitude
- M 1.7 (ml)
- Depth
- 8.3 km below the surface
- Felt
- no reports yet
- Nearest
- Custer County, 43 km S
- Nearest mapped fault
- Lost River fault, 15 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 618 days ago
Earthquake alerts for Challis, ID
Get a notification in this browser when USGS records an earthquake near Challis, ID. No account or email needed.
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 9 km (6 mi) from the epicentre. In Challis, 19 km away, the estimate is intensity II (weak). 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 10 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 1,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 95× the energy of this one
- This earthquake M 1.7 about 10 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 4.2 on 2025-01-27 — about 6,000 times the energy of this one.
Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:
- 6.1 37 km N of Stanley, Idaho · 44 km WSW of this epicentre
- 5.6 18 km ESE of Challis, Idaho · 35 km SE of this epicentre
- 5.5 22 km E of Clayton, Idaho · 46 km SSE of this epicentre
- 5.1 9 km SE of Challis, Idaho · 29 km SSE of this epicentre
- 5.0 9 km E of Challis, Idaho · 25 km SE 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 44.6557, -114.3552. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Custer County, ID | 43 km (27 mi) | S | earthquakes near Custer County |
| Lemhi County, ID | 48 km (30 mi) | NE | earthquakes near Lemhi County |
| Valley County, ID | 102 km (63 mi) | WNW | earthquakes near Valley County |
| Beaverhead County, MT | 127 km (79 mi) | ENE | earthquakes near Beaverhead County |
| Boise County, ID | 131 km (82 mi) | SW | earthquakes near Boise County |
| Butte County, ID | 143 km (89 mi) | SE | earthquakes near Butte County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
38 earthquakes have been recorded within 50 km since this one.
- 1.7 32 km NNW of Challis, Idaho
- 1.6 32 km NNW of Challis, Idaho
- 2.0 33 km NNW of Challis, Idaho
- 2.0 33 km NNW of Challis, Idaho
- 1.6 32 km NNW of Challis, Idaho
- 2.3 32 km NNW of Challis, Idaho
- 1.6 2 km ENE of Clayton, Idaho
- 1.7 20 km NW of Challis, Idaho
- 1.7 12 km NNE of Challis, Idaho
- 1.7 32 km WSW of Salmon, Idaho
- 1.5 32 km WSW of Salmon, Idaho
- 2.2 2 km NE of Clayton, Idaho
- 1.8 2 km NE of Clayton, Idaho
- 1.7 2 km NE of Clayton, Idaho
- 1.6 20 km E of Clayton, 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
- 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.