quarry blast · reviewed by a seismologist
M 2.1md
10km N of Thermalito, CA
- When
- Magnitude
- M 2.1 (md)
- Depth
- -0.4 km below the surface
- Felt
- no reports yet
- Nearest
- Butte County, 7 km N
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3110 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
USGS catalogues this as quarry blast, not an earthquake.
How big was it?
This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
- Magna, Utah 2020 M 5.7 250,000× the energy of this one
- Around the size people start to feel M 3.0 22× the energy of this one
- This earthquake M 2.1 about 43 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 39.5992, -121.5882. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Butte County, CA | 7 km (5 mi) | S of here | earthquakes near Butte County |
| Yuba County, CA | 42 km (26 mi) | NNW of here | earthquakes near Yuba County |
| Sutter County, CA | 63 km (39 mi) | N of here | earthquakes near Sutter County |
| Glenn County, CA | 70 km (43 mi) | E of here | earthquakes near Glenn County |
| Colusa County, CA | 73 km (45 mi) | NE of here | earthquakes near Colusa County |
| Nevada County, CA | 78 km (48 mi) | WNW of here | earthquakes near Nevada County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 1.6 8km W of La Porte, CA
- 2.5 8km W of Durham, CA
- 1.6 15km SW of Durham, CA
- 2.2 11km N of Oroville, CA
- 1.6 18km ESE of Willows, CA
- 2.3 12km W of La Porte, CA
- 1.7 16km E of Willows, CA
- 1.7 12km W of Loma Rica, CA
- 2.6 13km W of La Porte, CA
- 2.2 15km ENE of Willows, CA
- 2.1 12km WSW of La Porte, CA
- 2.2 12km W of La Porte, CA
- 1.8 13km W of La Porte, CA
- 1.8 6km WSW of Belden, CA
- 1.9 12km W of La Porte, 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.