Earthquake · reviewed by a seismologist
M 2.7md
1 km SE of Pacheco, California
- When
- Magnitude
- M 2.7 (md)
- Depth
- 16 km below the surface
- Felt
- 25 reports · strongest reported intensity IV
- Nearest
- Contra Costa County, 12 km ESE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3293 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 25 people have reported feeling it to USGS.
How big was it?
This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
- Magna, Utah 2020 M 5.7 32,000× the energy of this one
- Around the size people start to feel M 3.0 2.8× the energy of this one
- This earthquake M 2.7 about 340 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 37.9773, -122.0658. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Contra Costa County, CA | 12 km (7 mi) | WNW 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 | 60 km (37 mi) | E of here | earthquakes near Marin County |
| Napa County, CA | 63 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
43 earthquakes have been recorded within 50 km since this one.
- 1.8 3km SE of Oakland, CA
- 1.6 4km WNW of San Francisco Zoo, 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
- 2.7 0km SW of Pacheco, CA
- 1.5 8km SSE of Rio Vista, CA
- 2.3 2km NW of Pittsburg, CA
- 2.1 2km ENE of Berkeley, CA
- 1.6 2km E of Diablo, CA
- 1.6 6km ENE of Dublin, CA
- 1.8 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.
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.