Earthquake · reviewed by a seismologist
M 1.7md
3km ENE of Pacheco, CA
- When
- Magnitude
- M 1.7 (md)
- Depth
- 17 km below the surface
- Felt
- no reports yet
- Nearest
- Contra Costa County, 12 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2519 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 1,300,000× the energy of this one
- Magna, Utah 2020 M 5.7 900,000× the energy of this one
- Around the size people start to feel M 3.0 80× 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 37.9948, -122.0473. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Contra Costa County, CA | 12 km (7 mi) | NW of here | earthquakes near Contra Costa County |
| Solano County, CA | 32 km (20 mi) | SSW of here | earthquakes near Solano County |
| Alameda County, CA | 40 km (25 mi) | NNW of here | earthquakes near Alameda County |
| Marin County, CA | 62 km (38 mi) | E of here | earthquakes near Marin County |
| Napa County, CA | 62 km (38 mi) | SSE of here | earthquakes near Napa County |
| San Joaquin County, CA | 68 km (42 mi) | W of here | earthquakes near San Joaquin 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.
- 1.9 2km NNE of San Ramon, CA
- 2.2 1km SW of Danville, CA
- 1.9 4km N of Diablo, CA
- 1.5 6km ENE of Vallejo, CA
- 1.5 10km E of Blackhawk, CA
- 1.5 3km NE of Union City, CA
- 1.9 3km NW of Castro Valley, CA
- 1.5 5km E of Oakland, CA
- 1.5 5km E of Vallejo, CA
- 1.9 4km SSE of Elmira, CA
- 1.8 5km NNW of Green Valley, CA
- 1.6 3km ESE of Hayward, CA
- 2.3 2km ENE of El Cerrito, CA
- 2.1 1km NNE of Piedmont, CA
- 2.6 0km S of East Richmond Heights, 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 12,000 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.