Earthquake · reviewed by a seismologist
M 1.7md
10km ESE of Clayton, CA
- When
- Magnitude
- M 1.7 (md)
- Depth
- 13 km below the surface
- Felt
- no reports yet
- Nearest
- Contra Costa County, 10 km WNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1638 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 10 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 1,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
- Around the size people start to feel M 3.0 92× the energy of this one
- This earthquake M 1.7 about 10 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 37.9002, -121.8375. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Contra Costa County, CA | 10 km (6 mi) | ESE of here | earthquakes near Contra Costa County |
| Alameda County, CA | 29 km (18 mi) | NNE of here | earthquakes near Alameda County |
| Solano County, CA | 42 km (26 mi) | SSE of here | earthquakes near Solano County |
| San Joaquin County, CA | 50 km (31 mi) | W of here | earthquakes near San Joaquin County |
| San Mateo County, CA | 72 km (44 mi) | NE of here | earthquakes near San Mateo County |
| Sacramento County, CA | 75 km (46 mi) | SW of here | earthquakes near Sacramento County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 1.8 3km NW of Orinda, CA
- 1.6 5km ENE of Walnut Creek, CA
- 2.2 9km NE of Milpitas, CA
- 1.8 3km NNE of San Leandro, CA
- 1.7 11km SE of Livermore, CA
- 1.8 12km SE of Livermore, CA
- 1.9 4km W of Pleasant Hill, CA
- 1.8 11km NE of Milpitas, CA
- 1.8 2km E of Walnut Creek, CA
- 1.5 4km WNW of Orinda, CA
- 1.6 6km WNW of Dublin, CA
- 1.9 3km SW of American Canyon, CA
- 2.5 4km SSE of Rodeo, CA
- 1.8 2km SSE of Alamo, CA
- 1.9 9km NE of Milpitas, 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 4.5 on 2019-10-15 — it released about 14,000 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.