Earthquake · reviewed by a seismologist
M 2.7md
14km ESE of Alum Rock, CA
- When
- Magnitude
- M 2.7 (md)
- Depth
- 8.0 km below the surface
- Felt
- 55 reports · strongest reported intensity IV
- Nearest
- Santa Clara County, 11 km S
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1363 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 55 people have reported feeling it to USGS.
How big was it?
This earthquake released about 360 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 42,000× the energy of this one
- Magna, Utah 2020 M 5.7 30,000× the energy of this one
- Around the size people start to feel M 3.0 2.6× the energy of this one
- This earthquake M 2.7 about 360 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 37.3163, -121.6812. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Santa Clara County, CA | 11 km (7 mi) | N of here | earthquakes near Santa Clara County |
| Alameda County, CA | 42 km (26 mi) | SSE of here | earthquakes near Alameda County |
| Santa Cruz County, CA | 44 km (28 mi) | NE of here | earthquakes near Santa Cruz County |
| San Mateo County, CA | 62 km (39 mi) | E of here | earthquakes near San Mateo County |
| Stanislaus County, CA | 66 km (41 mi) | WSW of here | earthquakes near Stanislaus County |
| Contra Costa County, CA | 71 km (44 mi) | SSE 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
55 earthquakes have been recorded within 50 km since this one.
- 1.7 10km NE of San Martin, CA
- 1.7 7km WSW of Gilroy, CA
- 1.5 19km WSW of Gustine, CA
- 3.3 3km N of Union City, CA
- 1.5 15km E of Seven Trees, CA
- 1.5 8km E of Gilroy, CA
- 2.0 15km E of Seven Trees, CA
- 1.6 18km WSW of Westley, CA
- 1.8 2km E of Aromas, CA
- 1.6 15km N of Morgan Hill, CA
- 1.5 10km E of Gilroy, CA
- 1.6 5km WSW of Cupertino, CA
- 2.6 4km ESE of Aromas, CA
- 1.6 16km E of Seven Trees, CA
- 2.1 12km ESE 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 5.1 on 2022-10-25 — it released about 3,200 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.