quarry blast · reviewed by a seismologist
M 1.6md
6km ENE of El Granada, CA
- When
- Magnitude
- M 1.6 (md)
- Depth
- -0.2 km below the surface
- Felt
- no reports yet
- Nearest
- San Mateo County, 12 km SSE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3205 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
USGS catalogues this as quarry blast, not an earthquake.
How big was it?
This earthquake released about 6.4 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 2,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
- Around the size people start to feel M 3.0 150× the energy of this one
- This earthquake M 1.6 about 6.4 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 37.5225, -122.4107. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| San Mateo County, CA | 12 km (8 mi) | NNW of here | earthquakes near San Mateo County |
| Alameda County, CA | 46 km (29 mi) | WSW of here | earthquakes near Alameda County |
| San Francisco County, CA | 59 km (37 mi) | ESE of here | earthquakes near San Francisco County |
| Contra Costa County, CA | 60 km (37 mi) | SW of here | earthquakes near Contra Costa County |
| Marin County, CA | 66 km (41 mi) | SSE of here | earthquakes near Marin County |
| Santa Cruz County, CA | 67 km (42 mi) | NNW of here | earthquakes near Santa Cruz County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
21 earthquakes have been recorded within 50 km since this one.
- 1.7 2km E of Hayward, CA
- 2.4 2km NNE of El Cerrito, CA
- 1.7 6km E of Fremont, CA
- 2.0 5km WSW of Daly City, CA
- 1.6 3km NNE of San Leandro, CA
- 1.8 4km WNW of San Francisco Zoo, CA
- 1.7 7km WNW of Lexington Hills, CA
- 1.8 3km SE of Oakland, CA
- 1.6 4km WNW of San Francisco Zoo, CA
- 1.7 4km SW of Stanford, CA
- 2.1 11km SSW of Loyola, CA
- 2.0 8km SW of Los Altos Hills, CA
- 2.3 3km N of San Leandro, CA
- 1.9 3km N of San Leandro, CA
- 2.4 2km E of Berkeley, 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.