Earthquake · reviewed by a seismologist
M 2.8md
6km WNW of Mountain House, CA
- When
- Magnitude
- M 2.8 (md)
- Depth
- 16 km below the surface
- Felt
- 14 reports · strongest reported intensity II
- Nearest
- Alameda County, 31 km WSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2877 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 14 people have reported feeling it to USGS.
How big was it?
This earthquake released about 450 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 34,000× the energy of this one
- Magna, Utah 2020 M 5.7 24,000× the energy of this one
- Around the size people start to feel M 3.0 2.1× the energy of this one
- This earthquake M 2.8 about 450 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 37.7952, -121.6117. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Alameda County, CA | 31 km (19 mi) | ENE of here | earthquakes near Alameda County |
| Contra Costa County, CA | 33 km (20 mi) | ESE of here | earthquakes near Contra Costa County |
| San Joaquin County, CA | 34 km (21 mi) | WSW of here | earthquakes near San Joaquin County |
| Stanislaus County, CA | 60 km (37 mi) | WNW of here | earthquakes near Stanislaus County |
| Solano County, CA | 60 km (37 mi) | SSE of here | earthquakes near Solano County |
| Santa Clara County, CA | 64 km (40 mi) | N 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
57 earthquakes have been recorded within 50 km since this one.
- 1.6 14km SSE of Livermore, CA
- 2.1 9km NNE of Alum Rock, CA
- 1.5 9km NNE of Alum Rock, CA
- 1.8 2km NE of San Leandro, CA
- 2.3 2km SSE of Concord, CA
- 2.0 3km E of Union City, CA
- 1.7 5km WNW of Sunol, CA
- 1.7 3km WNW of Diablo, CA
- 2.3 8km E of Alum Rock, CA
- 1.7 11km SE of Livermore, CA
- 1.6 5km SW of Pacheco, CA
- 2.7 3km NNE of San Ramon, CA
- 2.4 1km N of Vine Hill, CA
- 2.4 17km ESE of Livermore, CA
- 2.0 1km NNE of Pacheco, 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.