Earthquake · reviewed by a seismologist
M 2.2md
6km ESE of Penngrove, CA
- When
- Magnitude
- M 2.2 (md)
- Depth
- 5.0 km below the surface
- Felt
- 9 reports · strongest reported intensity III
- Nearest
- Marin County, 29 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1556 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 9 people have reported feeling it to USGS.
How big was it?
This earthquake released about 60 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 5.8 250,000× the energy of this one
- Magna, Utah 2020 M 5.7 180,000× the energy of this one
- Around the size people start to feel M 3.0 16× the energy of this one
- This earthquake M 2.2 about 60 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 38.2870, -122.6003. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Marin County, CA | 29 km (18 mi) | NNE of here | earthquakes near Marin County |
| Napa County, CA | 34 km (21 mi) | SW of here | earthquakes near Napa County |
| Sonoma County, CA | 39 km (24 mi) | SE of here | earthquakes near Sonoma County |
| Solano County, CA | 58 km (36 mi) | W of here | earthquakes near Solano County |
| Contra Costa County, CA | 70 km (43 mi) | NW of here | earthquakes near Contra Costa County |
| San Francisco County, CA | 73 km (45 mi) | NNE of here | earthquakes near San Francisco County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
43 earthquakes have been recorded within 50 km since this one.
- 1.5 5km SSE of Rodeo, CA
- 1.5 1km NNW of Larkfield-Wikiup, CA
- 1.6 4km E of Windsor, CA
- 1.9 6km ESE of Healdsburg, CA
- 2.1 1km WNW of Kensington, CA
- 2.3 1km WNW of Kensington, CA
- 2.2 1km W of Kensington, CA
- 1.6 5km NNE of Windsor, CA
- 1.8 6km ESE of Healdsburg, CA
- 1.7 11km WNW of Calistoga, CA
- 2.1 11km WNW of Calistoga, CA
- 1.8 14km NNE of Angwin, CA
- 1.6 7km ESE of Santa Venetia, CA
- 1.6 10km NNE of Healdsburg, CA
- 1.5 7km E of Santa Venetia, 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.