Earthquake · reviewed by a seismologist
M 2.2md
3km ENE of Walnut Creek, CA
- When
- Magnitude
- M 2.2 (md)
- Depth
- 10 km below the surface
- Felt
- 20 reports · strongest reported intensity III
- Nearest
- Contra Costa County, 7 km E
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1916 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 20 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 37.9213, -122.0315. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Contra Costa County, CA | 7 km (4 mi) | W of here | earthquakes near Contra Costa County |
| Alameda County, CA | 32 km (20 mi) | NNW of here | earthquakes near Alameda County |
| Solano County, CA | 39 km (24 mi) | SSW of here | earthquakes near Solano County |
| San Mateo County, CA | 64 km (40 mi) | NNE of here | earthquakes near San Mateo County |
| Marin County, CA | 64 km (40 mi) | ESE of here | earthquakes near Marin County |
| San Joaquin County, CA | 67 km (41 mi) | W of here | earthquakes near San Joaquin County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
32 earthquakes have been recorded within 50 km since this one.
- 1.8 7km N of Pittsburg, CA
- 1.7 1km WSW of Pleasant Hill, CA
- 1.5 10km SSE of Sunol, CA
- 2.0 8km N of Pittsburg, CA
- 2.0 6km NNE of Pittsburg, CA
- 2.3 2km ESE of Pleasanton, CA
- 1.5 3km NNW of Benicia, CA
- 1.9 2km NNE of Bethel Island, CA
- 1.5 5km N of Dublin, CA
- 1.6 6km ESE of Santa Venetia, CA
- 1.8 5km NNE of Black Point-Green Point, CA
- 1.5 4km SSE of Brentwood, CA
- 1.7 2km SW of Clayton, CA
- 1.7 6km W of Brentwood, CA
- 2.3 3km ENE of San Ramon, 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.
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.