Earthquake · reviewed by a seismologist
M 3.0ml
2km ESE of Pacheco, CA
- When
- Magnitude
- M 3.0 (ml)
- Depth
- 16 km below the surface
- Felt
- 245 reports · strongest reported intensity IV
- Nearest
- Contra Costa County, 11 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2952 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 245 people have reported feeling it to USGS.
How big was it?
This earthquake released about 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 350,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
- Magna, Utah 2020 M 5.7 11,000× the energy of this one
- This earthquake M 3.0 about 950 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 37.9757, -122.0578. 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 | 34 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 | 61 km (38 mi) | E of here | earthquakes near Marin County |
| Napa County, CA | 64 km (39 mi) | SSE of here | earthquakes near Napa County |
| San Mateo County, CA | 68 km (42 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
50 earthquakes have been recorded within 50 km since this one.
- 2.1 5km E of Union City, CA
- 1.5 3km NNW of Orinda, CA
- 2.5 9km N of Bay Point, CA
- 1.8 2km E of Alamo, CA
- 1.5 2km E of Alamo, CA
- 1.6 9km ENE of Blackhawk, CA
- 1.7 2km SW of Concord, CA
- 2.1 2km SSW of Dublin, CA
- 2.3 5km ESE of Blackhawk, CA
- 2.2 10km NNE of Livermore, CA
- 2.6 2km W of Concord, CA
- 1.8 4km SW of Livermore, CA
- 1.6 9km NNE of Livermore, CA
- 1.6 3km N of Piedmont, CA
- 2.9 12km SE of Suisun City, 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 4.4 on 2018-01-04 — it released about 120 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.