Earthquake · reviewed by a seismologist
M 2.5md
6km WSW of San Francisco Zoo, CA
- When
- Magnitude
- M 2.5 (md)
- Depth
- 8.9 km below the surface
- Felt
- 66 reports · strongest reported intensity III
- Nearest
- San Mateo County, 38 km SSE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2539 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 66 people have reported feeling it to USGS.
How big was it?
This earthquake released about 200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 75,000× the energy of this one
- Magna, Utah 2020 M 5.7 53,000× the energy of this one
- Around the size people start to feel M 3.0 4.7× the energy of this one
- This earthquake M 2.5 about 200 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 37.7192, -122.5648. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| San Mateo County, CA | 38 km (24 mi) | NNW of here | earthquakes near San Mateo County |
| Marin County, CA | 40 km (25 mi) | SSE of here | earthquakes near Marin County |
| San Francisco County, CA | 41 km (26 mi) | E of here | earthquakes near San Francisco County |
| Alameda County, CA | 58 km (36 mi) | W of here | earthquakes near Alameda County |
| Contra Costa County, CA | 58 km (36 mi) | WSW of here | earthquakes near Contra Costa County |
| Solano County, CA | 82 km (51 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
32 earthquakes have been recorded within 50 km since this one.
- 1.9 5km NNW of San Leandro, CA
- 1.8 14km S of Bolinas, CA
- 2.6 3km NW of Castro Valley, CA
- 2.2 2km WNW of Orinda, CA
- 2.1 2km NE of San Leandro, CA
- 1.6 1km SSE of Palo Alto, CA
- 2.3 2km ENE of San Leandro, CA
- 1.7 3km WSW of San Francisco Zoo, CA
- 2.1 1km ENE of El Cerrito, CA
- 1.9 2km SSW of Pleasant Hill, CA
- 2.4 33km S of Point Reyes, CA
- 1.7 12km WSW of Portola Valley, CA
- 2.5 4km SE of Oakland, CA
- 1.8 5km SSW of Port Costa, CA
- 1.6 8km WNW of San Francisco Zoo, 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 560 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.