QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

9km N of Bay Point, CA

· 21 km deep · released about 140 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 18 kmContra Costa County 21 kmAlameda County 52 kmNapa County 55 kmSan Joaquin County 63 kmYolo County 63 kmSacramento County 65 kmMarin County 70 kmSan Mateo County 86 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 2.5 (md)
Depth
21 km below the surface
Felt
4 reports · strongest reported intensity II
Nearest
Solano County, 18 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2952 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 140 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 75,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.7× the energy of this one
  4. This earthquake M 2.5 about 140 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 38.1102, -121.9555. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 18 km (11 mi) S of here earthquakes near Solano County
Contra Costa County, CA 21 km (13 mi) N of here earthquakes near Contra Costa County
Alameda County, CA 52 km (32 mi) N of here earthquakes near Alameda County
Napa County, CA 55 km (34 mi) SE of here earthquakes near Napa County
San Joaquin County, CA 63 km (39 mi) WNW of here earthquakes near San Joaquin County
Yolo County, CA 63 km (39 mi) S of here earthquakes near Yolo 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. 1.9 3km N of Piedmont, CA
  2. 1.8 3km NNW of Piedmont, CA
  3. 3.4 3km NNW of Piedmont, CA
  4. 1.8 0km W of Crockett, CA
  5. 2.0 3km NNE of Fairview, CA
  6. 2.0 3km ESE of Berkeley, CA
  7. 2.0 2km W of Orinda, CA
  8. 2.3 1km NNW of San Pablo, CA
  9. 1.6 5km SW of Dublin, CA
  10. 1.7 1km E of Pacheco, CA
  11. 2.0 3km ENE of San Leandro, CA
  12. 1.6 5km E of San Ramon, CA
  13. 1.8 6km SSW of Yountville, CA
  14. 1.6 8km SW of Napa, CA
  15. 2.4 2km NW of Pittsburg, 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 790 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.