QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

6km N of Diablo, CA

· 11 km deep · released about 100 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 4 kmAlameda County 27 kmSolano County 43 kmSan Joaquin County 61 kmSan Mateo County 64 kmMarin County 71 kmNapa County 76 kmSanta Clara County 78 kmSacramento County 83 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 2.4 (md)
Depth
11 km below the surface
Felt
8 reports · strongest reported intensity III
Nearest
Contra Costa County, 4 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2524 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 8 people have reported feeling it to USGS.

How big was it?

This earthquake released about 100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 150,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 110,000× the energy of this one
  3. Around the size people start to feel M 3.0 9.4× the energy of this one
  4. This earthquake M 2.4 about 100 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 37.8853, -121.9620. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 4 km (2 mi) SSW of here earthquakes near Contra Costa County
Alameda County, CA 27 km (17 mi) N of here earthquakes near Alameda County
Solano County, CA 43 km (26 mi) S of here earthquakes near Solano County
San Joaquin County, CA 61 km (38 mi) W of here earthquakes near San Joaquin County
San Mateo County, CA 64 km (39 mi) NE of here earthquakes near San Mateo County
Marin County, CA 71 km (44 mi) ESE of here earthquakes near Marin County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

58 earthquakes have been recorded within 50 km since this one.

  1. 1.9 4km N of Diablo, CA
  2. 1.5 6km ENE of Vallejo, CA
  3. 1.6 11km ESE of Sunol, CA
  4. 2.4 11km ESE of Sunol, CA
  5. 1.5 10km E of Blackhawk, CA
  6. 1.5 3km NE of Union City, CA
  7. 1.9 3km NW of Castro Valley, CA
  8. 1.5 5km E of Oakland, CA
  9. 1.5 5km E of Vallejo, CA
  10. 1.9 4km SSE of Elmira, CA
  11. 1.8 5km NNW of Green Valley, CA
  12. 1.6 3km ESE of Hayward, CA
  13. 2.3 2km ENE of El Cerrito, CA
  14. 2.1 1km NNE of Piedmont, CA
  15. 2.2 10km SE of Livermore, 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 4.5 on 2019-10-15 — it released about 1,500 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.