Earthquake · reviewed by a seismologist
M 1.7md
1 km WNW of Concord, California
- When
- Magnitude
- M 1.7 (md)
- Depth
- 18 km below the surface
- Felt
- no reports yet
- Nearest
- Contra Costa County, 11 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3266 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 12 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
- Magna, Utah 2020 M 5.7 870,000× the energy of this one
- Around the size people start to feel M 3.0 78× the energy of this one
- This earthquake M 1.7 about 12 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 37.9817, -122.0475. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Contra Costa County, CA | 11 km (7 mi) | NW of here | earthquakes near Contra Costa County |
| Solano County, CA | 33 km (21 mi) | SSW of here | earthquakes near Solano County |
| Alameda County, CA | 39 km (24 mi) | NNW of here | earthquakes near Alameda County |
| Marin County, CA | 62 km (38 mi) | E of here | earthquakes near Marin County |
| Napa County, CA | 63 km (39 mi) | SSE of here | earthquakes near Napa County |
| San Joaquin County, CA | 68 km (42 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
40 earthquakes have been recorded within 50 km since this one.
- 1.9 2km WNW of Diablo, CA
- 2.8 2km W of Diablo, CA
- 2.2 2km WNW of Diablo, CA
- 2.4 2km NNE of El Cerrito, CA
- 2.0 0km WNW of Pacheco, CA
- 1.8 9km E of Livermore, CA
- 1.7 6km NE of Vallejo, CA
- 1.6 3km NNE of San Leandro, CA
- 1.8 3km SE of Oakland, CA
- 2.3 3km N of San Leandro, CA
- 1.5 5km E of Vallejo, CA
- 1.9 3km N of San Leandro, CA
- 2.4 2km E of Berkeley, CA
- 1.6 2km E of Hayward, CA
- 4.4 2km SE of Berkeley, 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.