Earthquake · reviewed by a seismologist
M 2.6ml
8km ENE of Alum Rock, CA
- When
- Magnitude
- M 2.6 (ml)
- Depth
- 6.6 km below the surface
- Felt
- 18 reports · strongest reported intensity IV
- Nearest
- Santa Clara County, 19 km SSE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1723 days ago
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 18 people have reported feeling it to USGS.
How big was it?
This earthquake released about 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
- Magna, Utah 2020 M 5.7 45,000× the energy of this one
- Around the size people start to feel M 3.0 4× the energy of this one
- This earthquake M 2.6 about 240 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 37.3858, -121.7390. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction | |
|---|---|---|---|
| Santa Clara County, CA | 19 km (12 mi) | NNW of here | earthquakes near Santa Clara County |
| Alameda County, CA | 33 km (20 mi) | SSE of here | earthquakes near Alameda County |
| Santa Cruz County, CA | 48 km (30 mi) | NNE of here | earthquakes near Santa Cruz County |
| San Mateo County, CA | 56 km (35 mi) | E of here | earthquakes near San Mateo County |
| Contra Costa County, CA | 62 km (39 mi) | SSE of here | earthquakes near Contra Costa County |
| Stanislaus County, CA | 68 km (42 mi) | WSW of here | earthquakes near Stanislaus 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.
- 1.9 6km WNW of Dublin, CA
- 2.2 5km WNW of Dublin, CA
- 1.7 7km ENE of Gilroy, CA
- 1.9 8km E of Fremont, CA
- 2.3 9km E of Gilroy, CA
- 1.9 9km E of Gilroy, CA
- 2.1 11km SSW of Brentwood, CA
- 1.6 1km NE of San Ramon, CA
- 1.5 2km NE of Union City, CA
- 1.7 11km NE of Milpitas, CA
- 1.5 10km ENE of Milpitas, CA
- 2.1 9km E of Alum Rock, CA
- 2.3 4km NE of Fairview, CA
- 1.8 5km NNE of Alum Rock, CA
- 1.6 2km NE of San Ramon, 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 4.3 on 2019-07-16 — it released about 370 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.