Earthquake · reviewed by a seismologist
M 2.5md
22km W of Westley, CA
- When
- Magnitude
- M 2.5 (md)
- Depth
- 2.5 km below the surface
- Felt
- 22 reports · strongest reported intensity III
- Nearest
- Santa Clara County, 39 km SW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3167 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 22 people have reported feeling it to USGS.
How big was it?
This earthquake released about 190 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 78,000× the energy of this one
- Magna, Utah 2020 M 5.7 55,000× the energy of this one
- Around the size people start to feel M 3.0 4.9× the energy of this one
- This earthquake M 2.5 about 190 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 37.5108, -121.4422. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Santa Clara County, CA | 39 km (24 mi) | NE of here | earthquakes near Santa Clara County |
| Stanislaus County, CA | 39 km (24 mi) | W of here | earthquakes near Stanislaus County |
| Alameda County, CA | 44 km (27 mi) | ESE of here | earthquakes near Alameda County |
| San Joaquin County, CA | 49 km (31 mi) | SSW of here | earthquakes near San Joaquin County |
| Contra Costa County, CA | 64 km (40 mi) | SE of here | earthquakes near Contra Costa County |
| Merced County, CA | 73 km (45 mi) | WNW of here | earthquakes near Merced County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
13 earthquakes have been recorded within 50 km since this one.
- 1.7 6km E of Fremont, CA
- 1.8 9km ENE of Milpitas, CA
- 1.8 6km W of French Camp, CA
- 1.8 9km E of Livermore, CA
- 2.0 12km SSW of Mountain House, CA
- 2.5 8km ENE of San Martin, CA
- 2.9 16km E of Seven Trees, CA
- 1.6 10km NNE of Alum Rock, CA
- 2.0 15km E of Seven Trees, CA
- 3.0 16km N of Morgan Hill, CA
- 1.5 7km SE of Seven Trees, CA
- 1.5 9km SE of Livermore, CA
- 2.0 20km W of Westley, 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 4.1 on 2017-10-10 — it released about 210 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.