Earthquake · reviewed by a seismologist
M 1.5md
6km NNE of Almanor, CA
- When
- Magnitude
- M 1.5 (md)
- Depth
- 8.2 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Plumas County, 42 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2028 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.
How big was it?
This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
- Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
- Around the size people start to feel M 3.0 180× the energy of this one
- This earthquake M 1.5 about 5.4 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 40.2660, -121.1642. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Plumas County, CA | 42 km (26 mi) | NW of here | earthquakes near Plumas County |
| Lassen County, CA | 68 km (42 mi) | SW of here | earthquakes near Lassen County |
| Butte County, CA | 77 km (48 mi) | NNE of here | earthquakes near Butte County |
| Tehama County, CA | 92 km (57 mi) | E of here | earthquakes near Tehama County |
| Shasta County, CA | 92 km (57 mi) | SE of here | earthquakes near Shasta County |
| Sierra County, CA | 94 km (59 mi) | NW of here | earthquakes near Sierra County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 2.1 3km NNE of Chester, CA
- 2.7 5km ENE of East Quincy, CA
- 1.8 3km NNE of Chester, CA
- 2.1 3km NNE of Chester, CA
- 2.1 14km ESE of Viola, CA
- 1.9 13km WSW of Almanor, CA
- 1.9 9km WSW of Chester, CA
- 1.5 12km ESE of Viola, CA
- 2.0 9km WSW of Chester, CA
- 1.5 12km ESE of Viola, CA
- 2.2 4km ENE of Prattville, CA
- 1.9 10km WSW of Chester, CA
- 2.1 4km SE of Taylorsville, CA
- 1.6 15km NNE of Mineral, CA
- 1.9 12km ESE of Viola, CA
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.