Earthquake · reviewed by a seismologist
M 1.9md
5km NW of Dublin, CA
- When
- Magnitude
- M 1.9 (md)
- Depth
- 4.2 km below the surface
- Felt
- no reports yet
- Nearest
- Alameda County, 11 km SSE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1948 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 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 790,000× the energy of this one
- Magna, Utah 2020 M 5.7 560,000× the energy of this one
- Around the size people start to feel M 3.0 50× the energy of this one
- This earthquake M 1.9 about 19 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 37.7347, -121.9748. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Alameda County, CA | 11 km (7 mi) | NNW of here | earthquakes near Alameda County |
| Contra Costa County, CA | 21 km (13 mi) | S of here | earthquakes near Contra Costa County |
| San Mateo County, CA | 50 km (31 mi) | NE of here | earthquakes near San Mateo County |
| Solano County, CA | 59 km (37 mi) | S of here | earthquakes near Solano County |
| Santa Clara County, CA | 62 km (39 mi) | NNW of here | earthquakes near Santa Clara County |
| San Joaquin County, CA | 66 km (41 mi) | WSW 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
55 earthquakes have been recorded within 50 km since this one.
- 1.7 5km WNW of Dublin, CA
- 1.5 5km E of Fremont, CA
- 1.6 1km NE of Berkeley, CA
- 2.1 8km ENE of Alum Rock, CA
- 2.0 1km NNW of Pleasant Hill, CA
- 2.1 15km ENE of Alum Rock, CA
- 2.4 5km SE of Portola Valley, CA
- 1.6 9km WSW of Mountain House, CA
- 1.5 2km ESE of Berkeley, CA
- 1.9 11km NE of Milpitas, CA
- 1.5 4km E of Moraga, CA
- 2.2 4km NNE of Blackhawk, CA
- 2.5 4km NNE of Blackhawk, CA
- 2.0 4km NE of Blackhawk, CA
- 1.9 4km SSW of Colma, 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 7,700 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.