Earthquake · reviewed by a seismologist
M 3.6mw
2km W of Concord, CA
- When
- Magnitude
- M 3.6 (mw)
- Depth
- 15 km below the surface
- Felt
- 3784 reports · strongest reported intensity IV
- Measured shaking
- intensity III (ShakeMap)
- Nearest
- Contra Costa County, 10 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 623 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3784 people have reported feeling it to USGS.
How big was it?
This earthquake released about 4.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 40,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 1,800× the energy of this one
- Magna, Utah 2020 M 5.7 1,300× the energy of this one
- This earthquake M 3.6 about 4.2 tons of TNT
- Around the size people start to feel M 3.0 this one released 8.8× more
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 37.9708, -122.0407. 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 | 34 km (21 mi) | SSW of here | earthquakes near Solano County |
| Alameda County, CA | 38 km (23 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 | 65 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
40 earthquakes have been recorded within 50 km since this one.
- 1.9 6km SW of Clayton, CA
- 1.7 2km ESE of Berkeley, CA
- 1.8 2km ESE of Berkeley, CA
- 1.5 4km NW of Dublin, CA
- 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
- 1.7 7km W of Newark, CA
- 2.5 2km N of Piedmont, CA
- 1.8 3km WSW of Oakley, CA
- 1.9 10km SSE of Elmira, 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 18 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.