mining explosion · reviewed by a seismologist
M 2.4ml
10 km NW of Alma, Colorado
- When
- Magnitude
- M 2.4 (ml)
- Depth
- 0.0 km below the surface
- Felt
- no reports yet
- Nearest
- Lake County, 25 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 513 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
USGS catalogues this as mining explosion, not an earthquake.
How big was it?
This earthquake released about 120 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 5.8 130,000× the energy of this one
- Magna, Utah 2020 M 5.7 89,000× the energy of this one
- Around the size people start to feel M 3.0 7.9× the energy of this one
- This earthquake M 2.4 about 120 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 39.3586, -106.1439. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Lake County, CO | 25 km (15 mi) | NE of here | earthquakes near Lake County |
| Summit County, CO | 29 km (18 mi) | S of here | earthquakes near Summit County |
| Park County, CO | 45 km (28 mi) | NW of here | earthquakes near Park County |
| Clear Creek County, CO | 55 km (34 mi) | SW of here | earthquakes near Clear Creek County |
| Eagle County, CO | 56 km (35 mi) | ESE of here | earthquakes near Eagle County |
| Pitkin County, CO | 68 km (42 mi) | ENE of here | earthquakes near Pitkin 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.