Earthquake · reviewed by a seismologist
M 1.7md
5km WSW of Colma, CA
- When
- Magnitude
- M 1.7 (md)
- Depth
- 9.0 km below the surface
- Felt
- no reports yet
- Nearest
- San Mateo County, 30 km SSE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1508 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 12 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
- Magna, Utah 2020 M 5.7 870,000× the energy of this one
- Around the size people start to feel M 3.0 78× the energy of this one
- This earthquake M 1.7 about 12 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 37.6625, -122.5183. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| San Mateo County, CA | 30 km (19 mi) | NNW of here | earthquakes near San Mateo County |
| San Francisco County, CA | 46 km (28 mi) | E of here | earthquakes near San Francisco County |
| Marin County, CA | 48 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 | 57 km (36 mi) | WSW of here | earthquakes near Contra Costa County |
| Solano County, CA | 84 km (52 mi) | SW of here | earthquakes near Solano County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
51 earthquakes have been recorded within 50 km since this one.
- 2.8 3km S of Half Moon Bay, CA
- 1.7 3km SW of El Cerrito, CA
- 2.7 2km SSW of Alamo, CA
- 1.6 2km W of Walnut Creek, CA
- 1.6 3km ESE of Berkeley, CA
- 1.5 3km N of Piedmont, CA
- 1.5 5km SSE of Rodeo, CA
- 2.1 1km WNW of Kensington, CA
- 2.3 1km WNW of Kensington, CA
- 2.2 1km W of Kensington, CA
- 1.7 6km W of Newark, CA
- 1.8 6km SSE of Portola Valley, CA
- 2.0 6km SSE of Portola Valley, CA
- 2.1 6km SSE of Portola Valley, CA
- 1.9 6km SSE of Portola Valley, 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 9,100 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.