QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2mw

4km SSW of Calistoga, CA

· 11 km deep · released about 1,900 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 24 kmSonoma County 29 kmMarin County 56 kmYolo County 62 kmLake County 64 kmSolano County 65 kmColusa County 77 kmContra Costa County 89 kmSutter County 95 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 3.2 (mw)
Depth
11 km below the surface
Felt
496 reports · strongest reported intensity IV
Nearest
Napa County, 24 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 747 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 496 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2× more

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 38.5432, -122.5952. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 24 km (15 mi) W of here earthquakes near Napa County
Sonoma County, CA 29 km (18 mi) E of here earthquakes near Sonoma County
Marin County, CA 56 km (35 mi) NNE of here earthquakes near Marin County
Yolo County, CA 62 km (39 mi) WSW of here earthquakes near Yolo County
Lake County, CA 64 km (40 mi) SSE of here earthquakes near Lake County
Solano County, CA 65 km (40 mi) WNW of here earthquakes near Solano County

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

Aftershocks so far

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

  1. 1.6 7km NW of The Geysers, CA
  2. 2.2 3km NW of The Geysers, CA
  3. 2.1 6km NNE of Hidden Valley Lake, CA
  4. 1.8 1km E of The Geysers, CA
  5. 1.8 5km WNW of Cobb, CA
  6. 1.6 12km NW of The Geysers, CA
  7. 1.6 6km W of Cobb, CA
  8. 1.9 2km SSW of Anderson Springs, CA
  9. 1.9 6km WNW of The Geysers, CA
  10. 2.0 2km NE of The Geysers, CA
  11. 1.5 3km SW of Anderson Springs, CA
  12. 2.0 9km WNW of Cobb, CA
  13. 1.6 6km WNW of Cobb, CA
  14. 1.5 10km WNW of The Geysers, CA
  15. 2.0 10km WNW of The Geysers, 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 5.0 on 2016-12-14 — it released about 520 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.