QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

12 km ESE of Elmira, California

· 39 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 14 kmSacramento County 42 kmYolo County 44 kmContra Costa County 44 kmNapa County 53 kmSan Joaquin County 60 kmAlameda County 73 kmSutter County 83 kmMarin County 88 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
39 km below the surface
Felt
no reports yet
Nearest
Solano County, 14 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3490 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 51 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 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× 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 51 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 38.2953, -121.7835. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 14 km (9 mi) ENE of here earthquakes near Solano County
Sacramento County, CA 42 km (26 mi) WSW of here earthquakes near Sacramento County
Yolo County, CA 44 km (27 mi) SSE of here earthquakes near Yolo County
Contra Costa County, CA 44 km (28 mi) NNE of here earthquakes near Contra Costa County
Napa County, CA 53 km (33 mi) ESE of here earthquakes near Napa County
San Joaquin County, CA 60 km (37 mi) NW 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

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

  1. 1.8 1 km NNW of Pleasant Hill, California
  2. 1.9 0 km NNW of Pleasant Hill, California
  3. 1.8 7 km ENE of Napa, California
  4. 2.2 0 km ESE of North Gate, California
  5. 1.6 2 km SW of American Canyon, California
  6. 1.7 13 km NNW of Moskowite Corner, California
  7. 1.7 3 km W of Byron, California
  8. 1.7 1 km ESE of Pacheco, California
  9. 1.8 4 km ENE of Clayton, California
  10. 1.7 4 km NW of Acalanes Ridge, California
  11. 2.0 4 km SSE of Monument Hills, California
  12. 1.6 1 km E of North Gate, California
  13. 1.8 1 km N of Pleasant Hill, California
  14. 1.7 3 km SE of North Gate, California
  15. 1.5 1 km W of Concord, 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.