Earthquake · reviewed by a seismologist
M 1.6md
20km NE of Alum Rock, CA
- When
- Magnitude
- M 1.6 (md)
- Depth
- 11 km below the surface
- Felt
- no reports yet
- Nearest
- Alameda County, 29 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1359 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 8.7 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 8.7 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 37.4837, -121.6558. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Alameda County, CA | 29 km (18 mi) | SE of here | earthquakes near Alameda County |
| Santa Clara County, CA | 29 km (18 mi) | N of here | earthquakes near Santa Clara County |
| Contra Costa County, CA | 55 km (34 mi) | SSE of here | earthquakes near Contra Costa County |
| Stanislaus County, CA | 58 km (36 mi) | W of here | earthquakes near Stanislaus County |
| San Joaquin County, CA | 60 km (38 mi) | SW of here | earthquakes near San Joaquin County |
| Santa Cruz County, CA | 61 km (38 mi) | NNE of here | earthquakes near Santa Cruz County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
54 earthquakes have been recorded within 50 km since this one.
- 1.6 16km E of Seven Trees, CA
- 2.4 10km NE of Gilroy, CA
- 2.3 15km E of Seven Trees, CA
- 3.0 16km E of Seven Trees, CA
- 1.6 11km N of Morgan Hill, CA
- 2.0 22km WSW of Gustine, CA
- 1.5 5km NE of San Martin, CA
- 2.0 18km SSE of Livermore, CA
- 1.6 13km SSE of Livermore, CA
- 2.9 19km SSE of Livermore, CA
- 2.4 12km NNE of Alum Rock, CA
- 2.1 15km E of Seven Trees, CA
- 1.9 9km NE of Corralitos, CA
- 2.2 13km NE of Milpitas, CA
- 1.8 16km E of Seven Trees, 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 5.1 on 2022-10-25 — it released about 130,000 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.