Earthquake · reviewed by a seismologist
M 2.6md
3km WNW of Concord, CA
- When
- Magnitude
- M 2.6 (md)
- Depth
- 16 km below the surface
- Felt
- 84 reports · strongest reported intensity III
- Nearest
- Contra Costa County, 10 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2024 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 84 people have reported feeling it to USGS.
How big was it?
This earthquake released about 280 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 55,000× the energy of this one
- Magna, Utah 2020 M 5.7 39,000× the energy of this one
- Around the size people start to feel M 3.0 3.5× the energy of this one
- This earthquake M 2.6 about 280 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 37.9803, -122.0395. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Contra Costa County, CA | 10 km (6 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 (39 mi) | E of here | earthquakes near Marin County |
| Napa County, CA | 64 km (40 mi) | SSE of here | earthquakes near Napa County |
| San Joaquin County, CA | 67 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
41 earthquakes have been recorded within 50 km since this one.
- 1.6 1km ENE of Alameda, CA
- 1.9 1km N of East Richmond Heights, CA
- 1.6 2km W of Concord, CA
- 1.5 0km NW of Danville, CA
- 2.1 1km WNW of Danville, CA
- 2.8 2km N of Piedmont, CA
- 1.5 5km E of Vallejo, CA
- 2.5 2km N of Piedmont, CA
- 1.8 3km WSW of Oakley, CA
- 1.9 10km SSE of Elmira, CA
- 1.8 3km S of Concord, CA
- 1.6 6km ESE of Santa Venetia, CA
- 1.8 1km SW of East Richmond Heights, CA
- 2.4 0km W of Pleasant Hill, CA
- 2.1 4km WSW of Pleasanton, 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 540 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.