Earthquake · reviewed by a seismologist
M 2.8md
10km ENE of Yountville, CA
- When
- Magnitude
- M 2.8 (md)
- Depth
- 11 km below the surface
- Felt
- 42 reports · strongest reported intensity III
- Nearest
- Napa County, 11 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1943 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 42 people have reported feeling it to USGS.
How big was it?
This earthquake released about 490 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 31,000× the energy of this one
- Magna, Utah 2020 M 5.7 22,000× the energy of this one
- Around the size people start to feel M 3.0 1.9× the energy of this one
- This earthquake M 2.8 about 490 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 38.4262, -122.2557. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Napa County, CA | 11 km (7 mi) | SE of here | earthquakes near Napa County |
| Solano County, CA | 33 km (20 mi) | WNW of here | earthquakes near Solano County |
| Yolo County, CA | 42 km (26 mi) | SW of here | earthquakes near Yolo County |
| Sonoma County, CA | 59 km (37 mi) | E of here | earthquakes near Sonoma County |
| Marin County, CA | 60 km (37 mi) | NE of here | earthquakes near Marin County |
| Contra Costa County, CA | 62 km (39 mi) | NNW 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.
- 1.6 4km W of Kenwood, CA
- 1.9 10km SSE of Elmira, CA
- 1.6 6km SSW of Calistoga, CA
- 1.6 21km ENE of Hidden Valley Lake, CA
- 1.6 3km NNW of Angwin, CA
- 1.6 6km SSW of Calistoga, CA
- 3.3 6km S of Calistoga, CA
- 2.5 6km S of Calistoga, CA
- 1.6 10km WNW of Calistoga, CA
- 1.8 11km ENE of Yountville, 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.