Earthquake · reviewed by a seismologist
M 1.8md
1km SE of Oakley, CA
- When
- Magnitude
- M 1.8 (md)
- Depth
- 9.4 km below the surface
- Felt
- 1 report · strongest reported intensity III
- Nearest
- Contra Costa County, 23 km WSW
- 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. 1 person has reported feeling it to USGS.
How big was it?
This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 730,000× the energy of this one
- Around the size people start to feel M 3.0 65× the energy of this one
- This earthquake M 1.8 about 15 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 37.9907, -121.7057. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Contra Costa County, CA | 23 km (14 mi) | ENE of here | earthquakes near Contra Costa County |
| Solano County, CA | 37 km (23 mi) | SSE of here | earthquakes near Solano County |
| San Joaquin County, CA | 38 km (24 mi) | W of here | earthquakes near San Joaquin County |
| Alameda County, CA | 42 km (26 mi) | NNE of here | earthquakes near Alameda County |
| Sacramento County, CA | 60 km (37 mi) | SSW of here | earthquakes near Sacramento County |
| Stanislaus County, CA | 78 km (48 mi) | NW of here | earthquakes near Stanislaus County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 1.8 2km NE of San Ramon, CA
- 2.0 14km N of Pittsburg, CA
- 2.2 1km NNW of Alamo, CA
- 1.6 2km SW of Diablo, CA
- 1.5 3km ESE of Berkeley, CA
- 1.7 3km NW of Diablo, CA
- 2.3 16km SSE of Livermore, CA
- 1.6 4km NNW of San Leandro, CA
- 1.8 6km ESE of San Ramon, CA
- 1.6 6km ESE of San Ramon, CA
- 1.6 9km WSW of Brentwood, CA
- 1.9 2km N of San Leandro, CA
- 1.8 2km E of San Leandro, CA
- 1.8 11km ESE of Sunol, CA
- 1.9 8km 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.
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.