Earthquake · reviewed by a seismologist
M 1.6md
14km SSW of Westley, CA
- When
- Magnitude
- M 1.6 (md)
- Depth
- -0.0 km below the surface
- Felt
- no reports yet
- Nearest
- Stanislaus County, 29 km ENE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 3078 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 9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
- Around the size people start to feel M 3.0 110× the energy of this one
- This earthquake M 1.6 about 9 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 37.4405, -121.2885. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Stanislaus County, CA | 29 km (18 mi) | WSW of here | earthquakes near Stanislaus County |
| Santa Clara County, CA | 43 km (27 mi) | NE of here | earthquakes near Santa Clara County |
| San Joaquin County, CA | 55 km (34 mi) | S of here | earthquakes near San Joaquin County |
| Merced County, CA | 57 km (35 mi) | WNW of here | earthquakes near Merced County |
| Alameda County, CA | 60 km (37 mi) | ESE of here | earthquakes near Alameda County |
| Contra Costa County, CA | 79 km (49 mi) | SE of here | earthquakes near Contra Costa 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.
- 1.8 11km ESE of Sunol, CA
- 2.0 20km E of Alum Rock, CA
- 1.9 8km SE of Livermore, CA
- 1.6 14km E of Seven Trees, CA
- 1.7 8km ENE of Gilroy, CA
- 1.7 17km SE of Livermore, CA
- 1.8 9km NNE of Alum Rock, CA
- 1.9 10km ESE of Sunol, CA
- 1.6 11km NE of Milpitas, CA
- 2.8 9km ENE of Milpitas, CA
- 2.4 24km SW of Gustine, CA
- 2.5 9km NE of San Martin, CA
- 3.4 9km ENE of Milpitas, CA
- 1.8 23km SW of Gustine, CA
- 1.6 8km NE of Alum Rock, 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 4,600 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.