Earthquake · reviewed by a seismologist
M 2.4ml
51 km NNW of Challis, ID
Yes. A magnitude 2.4 earthquake was recorded 51 km NNW of Challis, ID, at 11:41 am MST on 12 November 2020 (18:41 UTC), 12 km deep.
- When
- Magnitude
- M 2.4 (ml)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Lemhi County, 55 km E
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2184 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 18 km (11 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 140 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
- Magna, Utah 2020 M 5.7 78,000× the energy of this one
- Around the size people start to feel M 3.0 6.9× the energy of this one
- This earthquake M 2.4 about 140 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.
Where
Epicentre 44.8868, -114.5867. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lemhi County, ID | 55 km (34 mi) | E | earthquakes near Lemhi County |
| Custer County, ID | 73 km (45 mi) | SSE | earthquakes near Custer County |
| Valley County, ID | 81 km (51 mi) | W | earthquakes near Valley County |
| Idaho County, ID | 127 km (79 mi) | NNW | earthquakes near Idaho County |
| Boise County, ID | 134 km (83 mi) | SW | earthquakes near Boise County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 3.4 21 km NW of Challis, Idaho
- 2.6 27 km NNW of Challis, Idaho
- 1.5 southern Idaho
- 2.6 25 km NNW of Challis, Idaho
- 2.4 22 km NNW of Challis, Idaho
- 2.5 19 km NNW of Challis, Idaho
- 3.0 37 km W of Challis, Idaho
- 1.6 21 km NNW of Challis, Idaho
- 1.6 24 km NNW of Challis, Idaho
- 1.5 20 km NNW of Challis, Idaho
- 2.0 19 km NW of Challis, Idaho
- 2.4 32 km W of Challis, Idaho
- 1.5 36 km NNE of Stanley, Idaho
- 1.5 19 km NNW of Challis, Idaho
- 2.4 36 km W of Challis, 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.