Earthquake · reviewed by a seismologist
M 1.9ml
10 km WNW of Condon, MT
Yes. A magnitude 1.9 earthquake was recorded 10 km WNW of Condon, MT, at 6:38 am MST on 31 January 2020 (13:38 UTC), 20 km deep.
- When
- Magnitude
- M 1.9 (ml)
- Depth
- 20 km below the surface
- Felt
- no reports yet
- Nearest
- Lake County, 21 km WNW
- Nearest mapped fault
- Mission fault, 14 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 2478 days ago
Earthquake alerts for Ronan, MT
Get a notification in this browser when USGS records an earthquake near Ronan, MT. 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 it was probably too small to be felt, even directly above it. 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.
Earthquakes near other towns within 30 km: Ronan, Pablo, Polson.
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.
Where
Epicentre 47.5698, -113.8317. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Lake County, MT | 21 km (13 mi) | WNW | earthquakes near Lake County |
| Missoula County, MT | 61 km (38 mi) | S | earthquakes near Missoula County |
| Flathead County, MT | 82 km (51 mi) | NNW | earthquakes near Flathead County |
| Sanders County, MT | 103 km (64 mi) | WNW | earthquakes near Sanders County |
| Powell County, MT | 106 km (66 mi) | SE | earthquakes near Powell County |
| Mineral County, MT | 106 km (66 mi) | WSW | earthquakes near Mineral County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
56 earthquakes have been recorded within 50 km since this one.
- 1.6 6 km SW of Woods Bay, Montana
- 1.8 14 km WNW of Condon, Montana
- 1.5 5 km NE of Saint Ignatius, Montana
- 2.1 27 km E of Swan Lake, Montana
- 2.5 24 km E of Swan Lake, Montana
- 2.4 27 km E of Swan Lake, Montana
- 1.8 17 km E of Arlee, Montana
- 3.0 17 km SSE of Swan Lake, Montana
- 1.6 9 km ENE of Ronan, Montana
- 1.5 6 km SW of Condon, Montana
- 1.6 15 km ESE of Condon, Montana
- 1.6 4 km W of Ravalli, Montana
- 1.5 8 km ESE of Woods Bay, Montana
- 2.1 18 km SSE of Swan Lake, Montana
- 1.8 17 km SSW of Condon, Montana
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.