QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

7 km ENE of Napa, California

· 11 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 24 kmNapa County 24 kmYolo County 49 kmContra Costa County 49 kmMarin County 55 kmSonoma County 67 kmSacramento County 77 kmAlameda County 78 kmSutter County 91 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
11 km below the surface
Felt
no reports yet
Nearest
Solano County, 24 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3322 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 38.3135, -122.2065. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 24 km (15 mi) WNW of here earthquakes near Solano County
Napa County, CA 24 km (15 mi) SSE of here earthquakes near Napa County
Yolo County, CA 49 km (30 mi) SSW of here earthquakes near Yolo County
Contra Costa County, CA 49 km (31 mi) NNW of here earthquakes near Contra Costa County
Marin County, CA 55 km (34 mi) ENE of here earthquakes near Marin County
Sonoma County, CA 67 km (42 mi) ESE of here earthquakes near Sonoma County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.4 1km E of Pacheco, CA
  2. 1.6 2 km NNW of Pleasant Hill, California
  3. 2.3 1 km E of Pacheco, California
  4. 2.1 7 km ENE of Fetters Hot Springs-Agua Caliente, California
  5. 1.7 11 km NE of Oakville, California
  6. 1.6 7 km NE of Rohnert Park, California
  7. 2.0 2 km WSW of Clyde, California
  8. 2.0 6 km NW of Bayview, California
  9. 1.7 1 km SSW of Clyde, California
  10. 1.7 1 km SW of Clyde, California
  11. 2.3 2 km WSW of Clyde, California
  12. 1.5 1 km SSE of Clyde, California
  13. 1.8 16 km NNW of Moskowite Corner, California
  14. 2.6 7 km NE of Rohnert Park, California
  15. 1.7 1 km WNW 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.