QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

10km SSE of Elmira, CA

· 16 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 5 kmContra Costa County 39 kmYolo County 47 kmNapa County 47 kmSacramento County 51 kmSan Joaquin County 64 kmAlameda County 68 kmMarin County 79 kmSutter 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 1.8 (md)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Solano County, 5 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3203 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 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 38.2617, -121.8810. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 5 km (3 mi) E of here earthquakes near Solano County
Contra Costa County, CA 39 km (24 mi) N of here earthquakes near Contra Costa County
Yolo County, CA 47 km (29 mi) S of here earthquakes near Yolo County
Napa County, CA 47 km (29 mi) SE of here earthquakes near Napa County
Sacramento County, CA 51 km (32 mi) WSW of here earthquakes near Sacramento County
San Joaquin County, CA 64 km (40 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

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

  1. 2.8 2km WSW of Diablo, CA
  2. 3.5 2km ENE of Danville, CA
  3. 3.4 2km ENE of Danville, CA
  4. 1.5 2km SW of Diablo, CA
  5. 1.6 2km E of Danville, CA
  6. 3.3 2km ENE of Danville, CA
  7. 1.6 1km WNW of Diablo, CA
  8. 1.9 2km WSW of Diablo, CA
  9. 2.8 2km WSW of Diablo, CA
  10. 2.0 2km WSW of Diablo, CA
  11. 1.7 2km W of Diablo, CA
  12. 2.1 2km WSW of Diablo, CA
  13. 1.7 2km WSW of Diablo, CA
  14. 2.6 2km W of Diablo, CA
  15. 2.1 2km W of Diablo, 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.

On USGS

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