QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

3km N of Rodeo, CA

· 7.5 km deep · released about 98 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 32 kmSolano County 37 kmMarin County 42 kmNapa County 50 kmAlameda County 55 kmSan Mateo County 72 kmYolo County 76 kmSan Francisco County 77 kmSonoma County 78 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 2.3 (md)
Depth
7.5 km below the surface
Felt
28 reports · strongest reported intensity III
Nearest
Contra Costa County, 32 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3018 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 28 people have reported feeling it to USGS.

How big was it?

This earthquake released about 98 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 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 9.8× the energy of this one
  4. This earthquake M 2.3 about 98 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 38.0578, -122.2660. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 32 km (20 mi) WNW of here earthquakes near Contra Costa County
Solano County, CA 37 km (23 mi) SW of here earthquakes near Solano County
Marin County, CA 42 km (26 mi) E of here earthquakes near Marin County
Napa County, CA 50 km (31 mi) S of here earthquakes near Napa County
Alameda County, CA 55 km (34 mi) NW of here earthquakes near Alameda County
San Mateo County, CA 72 km (45 mi) N of here earthquakes near San Mateo County

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

Aftershocks so far

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

  1. 1.6 4km WSW of Daly City, CA
  2. 1.9 2km N of San Leandro, CA
  3. 1.8 2km E of San Leandro, CA
  4. 1.8 5km S of Alameda, CA
  5. 2.7 7km NNE of Bay Point, CA
  6. 2.6 6km SSE of Elmira, CA
  7. 2.1 2km NE of Oakland, CA
  8. 2.8 2km NE of Oakland, CA
  9. 2.0 1km S of Pleasant Hill, CA
  10. 2.1 6km NE of Penngrove, CA
  11. 1.5 2km WSW of San Lorenzo, CA
  12. 3.3 2km NNW of Crockett, CA
  13. 2.2 5km WSW of Yountville, CA
  14. 1.6 6km NE of Penngrove, CA
  15. 1.6 6km SSW of Stinson Beach, 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 4.4 on 2018-01-04 — it released about 1,100 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.