QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

6km W of Allendale, CA

· 21 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 21 kmYolo County 27 kmNapa County 28 kmSacramento County 58 kmContra Costa County 59 kmSutter County 71 kmMarin County 78 kmSonoma County 80 kmColusa County 83 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
21 km below the surface
Felt
no reports yet
Nearest
Solano County, 21 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1831 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 38.4487, -122.0098. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 21 km (13 mi) NNW of here earthquakes near Solano County
Yolo County, CA 27 km (17 mi) SSW of here earthquakes near Yolo County
Napa County, CA 28 km (18 mi) ESE of here earthquakes near Napa County
Sacramento County, CA 58 km (36 mi) W of here earthquakes near Sacramento County
Contra Costa County, CA 59 km (37 mi) N of here earthquakes near Contra Costa County
Sutter County, CA 71 km (44 mi) SSW of here earthquakes near Sutter 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. 1.9 1km W of Martinez, CA
  2. 1.9 7km NW of Bay Point, CA
  3. 1.8 7km NW of Bay Point, CA
  4. 2.0 6km NW of Bay Point, CA
  5. 2.2 7km NW of Bay Point, CA
  6. 1.8 6km NNW of Bay Point, CA
  7. 1.9 5km NNW of Bay Point, CA
  8. 1.7 6km NNW of Bay Point, CA
  9. 4.1 7km NW of Bay Point, CA
  10. 2.3 14km ESE of Angwin, CA
  11. 1.6 13km ESE of Angwin, CA
  12. 1.9 10km WNW of Laguna West-Lakeside, CA
  13. 1.6 8km ENE of Vallejo, CA
  14. 1.9 6km ENE of Kenwood, CA
  15. 1.8 5km E of Vallejo, 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.