Earthquake · reviewed by a seismologist
M 1.8md
5km S of Alameda, CA
- When
- Magnitude
- M 1.8 (md)
- Depth
- 9.0 km below the surface
- Felt
- 1 report · strongest reported intensity II
- Nearest
- Alameda County, 30 km ESE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2923 days ago
This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.
How big was it?
This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 760,000× the energy of this one
- Around the size people start to feel M 3.0 68× the energy of this one
- This earthquake M 1.8 about 14 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 37.7183, -122.2375. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Alameda County, CA | 30 km (18 mi) | WNW of here | earthquakes near Alameda County |
| Contra Costa County, CA | 34 km (21 mi) | SW of here | earthquakes near Contra Costa County |
| San Mateo County, CA | 36 km (22 mi) | NNE of here | earthquakes near San Mateo County |
| Marin County, CA | 58 km (36 mi) | SE of here | earthquakes near Marin County |
| Solano County, CA | 66 km (41 mi) | SSW of here | earthquakes near Solano County |
| San Francisco County, CA | 70 km (43 mi) | E of here | earthquakes near San Francisco County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 1.5 2km ENE of Hayward, CA
- 1.5 3km SSW of Loyola, CA
- 2.5 1km WNW of Crockett, CA
- 1.6 9km ENE of Milpitas, CA
- 1.5 3km S of Loyola, CA
- 1.5 3km S of Loyola, CA
- 1.7 9km NNE of Milpitas, CA
- 1.6 5km E of Fremont, CA
- 2.6 8km SE of Sunol, CA
- 1.5 3km S of Loyola, CA
- 2.3 3km E of Pacheco, CA
- 1.6 1km E of San Leandro, CA
- 1.7 3km S of Loyola, CA
- 2.3 3km ENE of Oakland, CA
- 1.6 2km ESE of Pleasanton, 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 7,900 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.