Earthquake · reviewed by a seismologist
M 1.6md
5km NNW of Pacifica, CA
- When
- Magnitude
- M 1.6 (md)
- Depth
- 7.8 km below the surface
- Felt
- no reports yet
- Nearest
- San Mateo County, 29 km SSE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3194 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 9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
- Around the size people start to feel M 3.0 110× the energy of this one
- This earthquake M 1.6 about 9 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 37.6510, -122.5145. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| San Mateo County, CA | 29 km (18 mi) | NNW of here | earthquakes near San Mateo County |
| San Francisco County, CA | 46 km (29 mi) | E of here | earthquakes near San Francisco County |
| Marin County, CA | 49 km (30 mi) | SSE of here | earthquakes near Marin County |
| Alameda County, CA | 53 km (33 mi) | W of here | earthquakes near Alameda County |
| Contra Costa County, CA | 58 km (36 mi) | WSW of here | earthquakes near Contra Costa County |
| Santa Cruz County, CA | 84 km (52 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
14 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
- 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
- 1.8 3km SE of Oakland, CA
- 1.6 4km WNW of San Francisco Zoo, CA
- 1.7 4km SW of Stanford, 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
- 1.6 2km E of Hayward, CA
- 4.4 2km SE 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.