Earthquake · reviewed by a seismologist
M 2.1md
5km WSW of Yountville, CA
- When
- Magnitude
- M 2.1 (md)
- Depth
- 8.8 km below the surface
- Felt
- no reports yet
- Nearest
- Napa County, 16 km NNE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3202 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 51 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 5.8 300,000× the energy of this one
- Magna, Utah 2020 M 5.7 210,000× the energy of this one
- Around the size people start to feel M 3.0 19× the energy of this one
- This earthquake M 2.1 about 51 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 38.3782, -122.4155. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Napa County, CA | 16 km (10 mi) | SSW of here | earthquakes near Napa County |
| Solano County, CA | 43 km (27 mi) | WNW of here | earthquakes near Solano County |
| Marin County, CA | 46 km (29 mi) | NE of here | earthquakes near Marin County |
| Sonoma County, CA | 47 km (29 mi) | ESE of here | earthquakes near Sonoma County |
| Yolo County, CA | 56 km (35 mi) | SW of here | earthquakes near Yolo County |
| Contra Costa County, CA | 65 km (40 mi) | NW of here | earthquakes near Contra Costa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
10 earthquakes have been recorded within 50 km since this one.
- 1.9 14km ESE of Hidden Valley Lake, CA
- 1.8 4km SSE of The Geysers, CA
- 1.8 5km SSE of The Geysers, CA
- 1.5 6km WNW of Saint Helena, CA
- 2.2 6km W of Temelec, CA
- 1.9 5km W of Calistoga, CA
- 2.8 6km W of Temelec, CA
- 1.8 7km SSW of Calistoga, CA
- 2.0 2km ENE of Saint Helena, CA
- 1.8 4km SW of Anderson Springs, 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.