Earthquake · automatic estimate, may change
M 2.2md
1 km E of Port Costa, CA
- When
- Magnitude
- M 2.2 (md)
- Depth
- 7.7 km below the surface
- Felt
- 65 reports · strongest reported intensity III
- Nearest
- Contra Costa County, 24 km SE
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 30 hours ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 65 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| felt reports | 59 | 65 |
Where
Epicentre 38.0453, -122.1723. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Contra Costa County, CA | 24 km (15 mi) | NW of here | earthquakes near Contra Costa County |
| Solano County, CA | 32 km (20 mi) | SW of here | earthquakes near Solano County |
| Alameda County, CA | 50 km (31 mi) | NNW of here | earthquakes near Alameda County |
| Marin County, CA | 50 km (31 mi) | E of here | earthquakes near Marin County |
| Napa County, CA | 53 km (33 mi) | SSE of here | earthquakes near Napa County |
| San Mateo County, CA | 72 km (45 mi) | NNE of here | earthquakes near San Mateo County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
3 earthquakes have been recorded within 50 km since this one.
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.
For this area
The largest earthquake within 50 km in our catalogue was M 4.5 on 2019-10-15 — it released about 2,500 times the energy of this one.
From the QuakeIndex catalogue, built from the USGS FDSN event service.
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.