Earthquake · reviewed by a seismologist
M 2.2md
12km NNE of Little Grass Valley, CA
- When
- Magnitude
- M 2.2 (md)
- Depth
- 6.5 km below the surface
- Felt
- 1 report · strongest reported intensity I
- Nearest
- Plumas County, 21 km NNE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2775 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 64 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 5.8 230,000× the energy of this one
- Magna, Utah 2020 M 5.7 170,000× the energy of this one
- Around the size people start to feel M 3.0 15× the energy of this one
- This earthquake M 2.2 about 64 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 39.8248, -120.9460. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Plumas County, CA | 21 km (13 mi) | SSW of here | earthquakes near Plumas County |
| Sierra County, CA | 46 km (28 mi) | NW of here | earthquakes near Sierra County |
| Butte County, CA | 59 km (37 mi) | ENE of here | earthquakes near Butte County |
| Nevada County, CA | 61 km (38 mi) | NNW of here | earthquakes near Nevada County |
| Yuba County, CA | 71 km (44 mi) | NNE of here | earthquakes near Yuba County |
| Placer County, CA | 87 km (54 mi) | NNW of here | earthquakes near Placer County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
46 earthquakes have been recorded within 50 km since this one.
- 2.4 2km ESE of Prattville, CA
- 1.8 4km SSE of East Shore, CA
- 1.6 8km W of La Porte, CA
- 1.9 12km SW of Almanor, CA
- 1.5 2km SW of Canyondam, CA
- 2.8 1km WNW of Twain, CA
- 2.4 4km ESE of Prattville, CA
- 1.6 3km NE of Almanor, CA
- 2.3 12km W of La Porte, CA
- 2.3 10km ESE of Taylorsville, CA
- 2.6 13km W of La Porte, CA
- 1.9 5km WSW of Greenville, CA
- 1.5 3 km N of Indian Falls, California
- 1.9 4km SSE of Johnsville, CA
- 1.5 4km S of East Shore, 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.