explosion · reviewed by a seismologist
M 2.2md
Earthquake near Grangeville, ID
No earthquake was likely felt in Grangeville in the 24 hours to 9:39 pm PST (05:39 UTC). The last one was M 4.3, 103 km (64 mi) SW, at 11:42 pm PST on 9 November 2026, estimated intensity II (weak) in town; 133 felt reports to USGS. Every earthquake near Grangeville
No: USGS classifies this as a explosion, not an earthquake. A magnitude 2.2 explosion was recorded 4 km (3 mi) south-southeast of Grangeville, ID, at 12:06 pm PDT on 4 May 2026 (19:06 UTC), less than 1 km deep.
USGS: 4 km SSE of Grangeville, Idaho
- When
- 12:06 pm PDT on 4 May 2026 ()
- Where
- 4 km (3 mi) south-southeast of Grangeville, ID · earthquakes near Grangeville
- Idaho today
- every earthquake in Idaho in the last 24 hours
- Magnitude
- M 2.2 (md)
- Depth
- -1.6 km below the surface
- Felt
- no reports yet
- Nearest
- Lewis County, 46 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 97 days ago
Earthquake alerts for Grangeville, ID
Get a notification in this browser when USGS records an earthquake near Grangeville, 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. In Grangeville, 4 km away, the estimate is intensity III (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.
USGS catalogues this as explosion, not an earthquake.
How big was it?
This earthquake released about 56 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 270,000× the energy of this one
- Magna, Utah 2020 M 5.7 190,000× the energy of this one
- Around the size people start to feel M 3.0 17× the energy of this one
- This earthquake M 2.2 about 56 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 4.1 on 2018-11-20 — about 760 times the energy of this one.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
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 45.8893, -116.1080. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lewis County, ID | 46 km (28 mi) | NNW | earthquakes near Lewis County |
| Idaho County, ID | 50 km (31 mi) | E | earthquakes near Idaho County |
| Nez Perce County, ID | 71 km (44 mi) | NW | earthquakes near Nez Perce County |
| Wallowa County, OR | 90 km (56 mi) | WSW | earthquakes near Wallowa County |
| Asotin County, WA | 92 km (57 mi) | WNW | earthquakes near Asotin County |
| Clearwater County, ID | 94 km (58 mi) | NNE | earthquakes near Clearwater County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
No further earthquakes have been recorded within 50 km since this one.
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.