Earthquake · reviewed by a seismologist
M 1.5md
2km WSW of San Lorenzo, CA
- When
- Magnitude
- M 1.5 (md)
- Depth
- 7.8 km below the surface
- Felt
- no reports yet
- Nearest
- Alameda County, 21 km E
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2944 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
How big was it?
This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
- Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
- Around the size people start to feel M 3.0 180× the energy of this one
- This earthquake M 1.5 about 5.4 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 37.6777, -122.1442. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Alameda County, CA | 21 km (13 mi) | W of here | earthquakes near Alameda County |
| Contra Costa County, CA | 32 km (20 mi) | SSW of here | earthquakes near Contra Costa County |
| San Mateo County, CA | 35 km (22 mi) | NE of here | earthquakes near San Mateo County |
| Santa Clara County, CA | 65 km (40 mi) | NW of here | earthquakes near Santa Clara County |
| Marin County, CA | 67 km (42 mi) | SE of here | earthquakes near Marin County |
| Solano County, CA | 68 km (42 mi) | SSW of here | earthquakes near Solano 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.
- 2.4 1km NW of Crockett, CA
- 1.6 8km NE of Alum Rock, CA
- 1.6 11km S of Portola Valley, CA
- 1.7 6km NE of Blackhawk, CA
- 1.7 3km S of Loyola, CA
- 1.6 2km NW of Crockett, CA
- 2.7 2km NW of Crockett, CA
- 3.5 2km NW of Crockett, CA
- 2.0 4km E of El Sobrante, CA
- 1.6 6km WNW of Mountain House, CA
- 1.7 4km SSW of Los Altos Hills, CA
- 2.8 6km WNW of Mountain House, CA
- 1.6 2km NW of Pacifica, CA
- 2.5 3km ESE of San Leandro, CA
- 1.5 16km SSE 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 21,000 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.