QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

10 km N of Bay Point, California

· 22 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 16 kmContra Costa County 23 kmAlameda County 53 kmNapa County 54 kmYolo County 62 kmSan Joaquin County 63 kmSacramento County 64 kmMarin County 71 kmSan Mateo County 87 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 2.1 (md)
Depth
22 km below the surface
Felt
no reports yet
Nearest
Solano County, 16 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 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 38.1247, -121.9452. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 16 km (10 mi) S of here earthquakes near Solano County
Contra Costa County, CA 23 km (14 mi) N of here earthquakes near Contra Costa County
Alameda County, CA 53 km (33 mi) N of here earthquakes near Alameda County
Napa County, CA 54 km (34 mi) SE of here earthquakes near Napa County
Yolo County, CA 62 km (38 mi) S of here earthquakes near Yolo County
San Joaquin County, CA 63 km (39 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. 1.6 0 km ENE of North Gate, California
  2. 2.5 1 km N of Pleasant Hill, California
  3. 1.8 1 km NNW of Pleasant Hill, California
  4. 1.7 4 km NNW of Orinda, California
  5. 2.6 2 km ESE of Berkeley, California
  6. 1.9 4 km NNW of Orinda, California
  7. 1.5 Northern California
  8. 1.6 4 km SE of Piedmont, California
  9. 1.5 9 km ESE of Black Point-Green Point, California
  10. 1.9 0 km NNW of Pleasant Hill, California
  11. 1.8 7 km ENE of Napa, California
  12. 2.0 0 km W of Kensington, California
  13. 1.7 0 km W of Kensington, California
  14. 2.0 4 km NNW of Orinda, California
  15. 2.2 0 km ESE of North Gate, 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.