Earthquake · reviewed by a seismologist
M 2.9ml
2km NW of Castro Valley, CA
- When
- Magnitude
- M 2.9 (ml)
- Depth
- 5.3 km below the surface
- Felt
- 229 reports · strongest reported intensity IV
- Nearest
- Alameda County, 18 km ESE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2463 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 229 people have reported feeling it to USGS.
How big was it?
This earthquake released about 570 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 27,000× the energy of this one
- Magna, Utah 2020 M 5.7 19,000× the energy of this one
- Around the size people start to feel M 3.0 1.7× the energy of this one
- This earthquake M 2.9 about 570 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 37.7067, -122.1035. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Alameda County, CA | 18 km (11 mi) | WNW of here | earthquakes near Alameda County |
| Contra Costa County, CA | 27 km (17 mi) | SSW of here | earthquakes near Contra Costa County |
| San Mateo County, CA | 40 km (25 mi) | NE of here | earthquakes near San Mateo County |
| Solano County, CA | 64 km (40 mi) | SSW of here | earthquakes near Solano County |
| Santa Clara County, CA | 65 km (40 mi) | NW of here | earthquakes near Santa Clara County |
| Marin County, CA | 68 km (42 mi) | SE of here | earthquakes near Marin County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
54 earthquakes have been recorded within 50 km since this one.
- 1.8 6km ESE of San Ramon, CA
- 1.9 18km SSE of Livermore, CA
- 1.6 6km ESE of San Ramon, CA
- 1.6 9km WSW of Brentwood, CA
- 2.0 4km SW of Colma, CA
- 1.6 4km WSW of Daly City, CA
- 1.9 2km N of San Leandro, CA
- 1.8 2km E of San Leandro, CA
- 1.8 5km S of Alameda, CA
- 1.8 11km ESE of Sunol, CA
- 1.9 8km SE of Livermore, CA
- 2.0 4km ESE of Union City, CA
- 2.7 7km NNE of Bay Point, CA
- 1.7 8km NNE of Milpitas, CA
- 1.7 17km SE of Livermore, 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 200 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.