QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

12 km NNE of Bay Point, California

· 23 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 15 kmContra Costa County 24 kmNapa County 54 kmAlameda County 54 kmYolo County 61 kmSan Joaquin County 62 kmSacramento County 62 kmMarin County 72 kmSan Mateo County 89 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 1.9 (md)
Depth
23 km below the surface
Felt
no reports yet
Nearest
Solano County, 15 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3442 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 790,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 560,000× the energy of this one
  3. Around the size people start to feel M 3.0 50× the energy of this one
  4. This earthquake M 1.9 about 19 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 38.1355, -121.9313. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 15 km (9 mi) S of here earthquakes near Solano County
Contra Costa County, CA 24 km (15 mi) N of here earthquakes near Contra Costa County
Napa County, CA 54 km (33 mi) SE of here earthquakes near Napa County
Alameda County, CA 54 km (34 mi) N of here earthquakes near Alameda County
Yolo County, CA 61 km (38 mi) S of here earthquakes near Yolo County
San Joaquin County, CA 62 km (38 mi) WNW of here earthquakes near San Joaquin 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. 1.8 2 km NNE of North Gate, California
  2. 1.6 0 km ENE of North Gate, California
  3. 2.5 1 km N of Pleasant Hill, California
  4. 1.8 1 km NNW of Pleasant Hill, California
  5. 1.7 4 km NNW of Orinda, California
  6. 2.6 2 km ESE of Berkeley, California
  7. 1.9 4 km NNW of Orinda, California
  8. 1.5 Northern California
  9. 1.6 4 km SE of Piedmont, California
  10. 1.5 9 km ESE of Black Point-Green Point, California
  11. 1.9 0 km NNW of Pleasant Hill, California
  12. 1.8 7 km ENE of Napa, California
  13. 2.0 0 km W of Kensington, California
  14. 1.7 0 km W of Kensington, California
  15. 2.0 4 km NNW of Orinda, California

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.

On USGS

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