QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

14 km SE of Angwin, CA

· 8.4 km deep · released about 22 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 3 kmYolo County 39 kmSolano County 42 kmSonoma County 54 kmMarin County 65 kmColusa County 73 kmContra Costa County 74 kmLake County 76 kmSutter 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
8.4 km below the surface
Felt
no reports yet
Nearest
Napa County, 3 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 698 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 38.5213, -122.3020. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 3 km (2 mi) NE of here earthquakes near Napa County
Yolo County, CA 39 km (24 mi) WSW of here earthquakes near Yolo County
Solano County, CA 42 km (26 mi) NW of here earthquakes near Solano County
Sonoma County, CA 54 km (34 mi) E of here earthquakes near Sonoma County
Marin County, CA 65 km (40 mi) NE of here earthquakes near Marin County
Colusa County, CA 73 km (45 mi) S of here earthquakes near Colusa County

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

Aftershocks so far

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

  1. 2.6 3 km NW of Anderson Springs, CA
  2. 3.0 0 km ENE of The Geysers, CA
  3. 1.8 10 km ESE of Angwin, CA
  4. 1.8 6 km E of Vallejo, CA
  5. 2.1 1 km NNW of The Geysers, CA
  6. 1.9 1 km NNW of The Geysers, CA
  7. 1.5 1 km NE of The Geysers, CA
  8. 1.8 2 km NNE of The Geysers, CA
  9. 2.4 1 km NNW of The Geysers, CA
  10. 1.5 7 km S of St. Helena, CA
  11. 2.6 1 km NNW of The Geysers, CA
  12. 1.6 1 km ENE of The Geysers, CA
  13. 1.7 2 km N of The Geysers, CA
  14. 2.2 3 km WSW of Anderson Springs, CA
  15. 2.1 3 km WSW of Anderson Springs, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2022-09-14 — it released about 5,200 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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