QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

20km E of Angwin, CA

· 6.4 km deep · released about 22 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 12 kmYolo County 30 kmSolano County 43 kmSonoma County 61 kmColusa County 67 kmSutter County 68 kmLake County 74 kmMarin County 74 kmContra Costa County 77 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 1.9 (md)
Depth
6.4 km below the surface
Felt
no reports yet
Nearest
Napa County, 12 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3008 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 22 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 680,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 480,000× the energy of this one
  3. Around the size people start to feel M 3.0 43× the energy of this one
  4. This earthquake M 1.9 about 22 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 38.5797, -122.2237. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 12 km (7 mi) NE of here earthquakes near Napa County
Yolo County, CA 30 km (19 mi) WSW of here earthquakes near Yolo County
Solano County, CA 43 km (27 mi) NW of here earthquakes near Solano County
Sonoma County, CA 61 km (38 mi) E of here earthquakes near Sonoma County
Colusa County, CA 67 km (41 mi) S of here earthquakes near Colusa County
Sutter County, CA 68 km (42 mi) SW of here earthquakes near Sutter County

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

Aftershocks so far

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

  1. 2.6 3km SE of The Geysers, CA
  2. 1.6 3km SSW of Anderson Springs, CA
  3. 1.6 2km SSW of Anderson Springs, CA
  4. 2.2 11km NE of Napa, CA
  5. 1.9 2km ENE of The Geysers, CA
  6. 2.2 8km SE of Suisun City, CA
  7. 2.1 4km SW of Anderson Springs, CA
  8. 1.8 2km ESE of The Geysers, CA
  9. 1.8 8km SE of Suisun City, CA
  10. 1.8 10km ESE of Hidden Valley Lake, CA
  11. 1.6 3km W of Anderson Springs, CA
  12. 2.1 2km SE of Anderson Springs, CA
  13. 2.3 3km NNW of Larkfield-Wikiup, CA
  14. 1.5 2km NNW of Larkfield-Wikiup, CA
  15. 2.5 3km NNW of Larkfield-Wikiup, 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.