Earthquake · reviewed by a seismologist
M 2.5md
2km ENE of Danville, CA
- When
- Magnitude
- M 2.5 (md)
- Depth
- 7.8 km below the surface
- Felt
- 73 reports · strongest reported intensity III
- Nearest
- Contra Costa County, 11 km NNE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3018 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 73 people have reported feeling it to USGS.
How big was it?
This earthquake released about 150 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 100,000× the energy of this one
- Magna, Utah 2020 M 5.7 72,000× the energy of this one
- Around the size people start to feel M 3.0 6.5× the energy of this one
- This earthquake M 2.5 about 150 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 37.8258, -121.9782. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Contra Costa County, CA | 11 km (7 mi) | SSW of here | earthquakes near Contra Costa County |
| Alameda County, CA | 21 km (13 mi) | NNW of here | earthquakes near Alameda County |
| Solano County, CA | 49 km (31 mi) | S of here | earthquakes near Solano County |
| San Mateo County, CA | 57 km (36 mi) | NE of here | earthquakes near San Mateo County |
| San Joaquin County, CA | 63 km (39 mi) | W of here | earthquakes near San Joaquin County |
| Santa Clara County, CA | 72 km (45 mi) | NNW of here | earthquakes near Santa Clara County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 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
- 1.8 9km NNE of Alum Rock, CA
- 1.9 10km ESE of Sunol, CA
- 1.6 11km NE of Milpitas, CA
- 2.1 2km NE of Oakland, CA
- 2.8 2km NE of Oakland, 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 760 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.