Earthquake · reviewed by a seismologist
M 1.8md
4km NE of Challenge-Brownsville, CA
- When
- Magnitude
- M 1.8 (md)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Yuba County, 26 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2955 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
- Magna, Utah 2020 M 5.7 840,000× the energy of this one
- Around the size people start to feel M 3.0 75× the energy of this one
- This earthquake M 1.8 about 13 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 39.4850, -121.2268. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Yuba County, CA | 26 km (16 mi) | NNE of here | earthquakes near Yuba County |
| Butte County, CA | 38 km (24 mi) | ESE of here | earthquakes near Butte County |
| Nevada County, CA | 44 km (28 mi) | WNW of here | earthquakes near Nevada County |
| Sierra County, CA | 61 km (38 mi) | W of here | earthquakes near Sierra County |
| Placer County, CA | 64 km (40 mi) | NW of here | earthquakes near Placer County |
| Sutter County, CA | 65 km (40 mi) | NE of here | earthquakes near Sutter County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 1.9 20km SW of Whitehawk, CA
- 2.4 6km SSE of Challenge-Brownsville, CA
- 2.0 8km ESE of Challenge-Brownsville, CA
- 1.9 11km N of Oroville, CA
- 2.2 8km ESE of Challenge-Brownsville, CA
- 2.0 10km NNW of Oroville, CA
- 2.1 8km ENE of Loma Rica, CA
- 1.8 9km SSE of Challenge-Brownsville, CA
- 2.3 8km WSW of Penn Valley, CA
- 2.1 9km ENE of Loma Rica, CA
- 1.6 10km E of Loma Rica, CA
- 1.9 10km ENE of Loma Rica, CA
- 1.7 10km N of Thermalito, CA
- 2.3 5km NNE of Little Grass Valley, CA
- 2.1 6km S of Bucks Lake, 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.