Earthquake · reviewed by a seismologist
M 1.6ml
34 km NW of Stanley, Idaho
Yes. A magnitude 1.6 earthquake was recorded 34 km NW of Stanley, Idaho, at 11:17 am MST on 6 February 2021 (18:17 UTC), 8.1 km deep.
- 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
- Valley County, 55 km NW
- Nearest mapped fault
- Sawtooth fault, 16 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 2101 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 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.
- Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
- Around the size people start to feel M 3.0 120× the energy of this one
- 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:
- 6.1 37 km N of Stanley, Idaho · 29 km ENE of this epicentre
- 6.0 44 km NNW of Stanley, Idaho · 21 km NNE 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 44.4468, -115.2227. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Valley County, ID | 55 km (34 mi) | NW | earthquakes near Valley County |
| Boise County, ID | 64 km (40 mi) | SW | earthquakes near Boise County |
| Custer County, ID | 80 km (49 mi) | ESE | earthquakes near Custer County |
| Gem County, ID | 103 km (64 mi) | WSW | earthquakes near Gem County |
| Adams County, ID | 109 km (68 mi) | WNW | earthquakes near Adams County |
| Camas County, ID | 111 km (69 mi) | SSE | earthquakes near Camas 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.
- 1.8 22 km WNW of Stanley, Idaho
- 2.3 33 km NW of Stanley, Idaho
- 2.7 32 km NW of Stanley, Idaho
- 2.2 10 km WNW of Stanley, Idaho
- 2.0 15 km ENE of Stanley, Idaho
- 1.9 26 km NE of Stanley, Idaho
- 1.8 8 km NNW of Stanley, Idaho
- 1.7 8 km NNW of Stanley, Idaho
- 2.4 22 km WNW of Stanley, Idaho
- 1.9 15 km NW of Stanley, Idaho
- 2.1 14 km ENE of Stanley, Idaho
- 1.6 22 km WNW of Stanley, Idaho
- 2.1 34 km NW of Stanley, Idaho
- 2.8 9 km N of Stanley, Idaho
- 1.8 8 km N 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
- 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.