Earthquake · reviewed by a seismologist
M 1.9ml
3 km NNW of Smiths Ferry, Idaho
Yes. A magnitude 1.9 earthquake was recorded 3 km NNW of Smiths Ferry, Idaho, 81 km (51 mi) N of Boise City, ID, at 9:27 pm MST on 6 February 2021 (04:27 UTC), 5.0 km deep.
81 km (51 mi) N of Boise City, ID
- When
- Idaho today
- every earthquake in Idaho in the last 24 hours
- Magnitude
- M 1.9 (ml)
- Depth
- 5.0 km below the surface
- Felt
- no reports yet
- Nearest
- Gem County, 37 km SW
- Nearest mapped fault
- Squaw Creek fault, 18 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 2100 days ago
Earthquake alerts for Emmett, ID
Get a notification in this browser when USGS records an earthquake near Emmett, 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 14 km (9 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
- Magna, Utah 2020 M 5.7 500,000× the energy of this one
- Around the size people start to feel M 3.0 45× the energy of this one
- This earthquake M 1.9 about 21 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 lists one earthquake of M5 or more within 50 km:
- 5.3 Western Idaho · 34 km WSW 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 44.3262, -116.1078. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Gem County, ID | 37 km (23 mi) | SW | earthquakes near Gem County |
| Boise County, ID | 49 km (30 mi) | SE | earthquakes near Boise County |
| Washington County, ID | 56 km (35 mi) | WNW | earthquakes near Washington County |
| Payette County, ID | 63 km (39 mi) | SW | earthquakes near Payette County |
| Adams County, ID | 67 km (42 mi) | NNW | earthquakes near Adams County |
| Valley County, ID | 71 km (44 mi) | NNE | earthquakes near Valley 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 Oregon-Idaho border region
- 3.4 14 km SW of Smiths Ferry, Idaho
- 1.8 10 km NNW of Cascade, Idaho
- 2.1 5 km N of Smiths Ferry, Idaho
- 1.9 6 km S of Cascade, Idaho
- 1.6 8 km WNW of Smiths Ferry, Idaho
- 2.0 9 km NNE of Cascade, Idaho
- 1.7 8 km WNW of Smiths Ferry, Idaho
- 2.4 6 km W of Smiths Ferry, Idaho
- 1.8 6 km WNW of Smiths Ferry, Idaho
- 1.9 5 km WNW of Smiths Ferry, Idaho
- 1.9 5 km WNW of Smiths Ferry, Idaho
- 2.3 5 km WNW of Smiths Ferry, Idaho
- 2.4 10 km W of Smiths Ferry, Idaho
- 1.9 6 km WNW of Smiths Ferry, 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.