QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

3km ESE of Santa Rosa, CA

· 9.3 km deep · released about 1.1 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 24 kmNapa County 31 kmMarin County 44 kmSolano County 67 kmYolo County 72 kmLake County 74 kmSan Francisco County 85 kmContra Costa County 86 kmColusa County 90 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 (ml)
Depth
9.3 km below the surface
Felt
1048 reports · strongest reported intensity IV
Nearest
Sonoma County, 24 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1474 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1048 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.1 tons 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 6.7 160,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,100× the energy of this one
  4. This earthquake M 3.2 about 1.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.2× 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 38.4417, -122.6712. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 24 km (15 mi) ESE of here earthquakes near Sonoma County
Napa County, CA 31 km (19 mi) WSW of here earthquakes near Napa County
Marin County, CA 44 km (27 mi) N of here earthquakes near Marin County
Solano County, CA 67 km (41 mi) WNW of here earthquakes near Solano County
Yolo County, CA 72 km (45 mi) WSW of here earthquakes near Yolo County
Lake County, CA 74 km (46 mi) S of here earthquakes near Lake County

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

Aftershocks so far

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

  1. 1.7 5km W of Cobb, CA
  2. 1.9 6km WNW of The Geysers, CA
  3. 1.9 6km WNW of The Geysers, CA
  4. 1.6 1km NNE of The Geysers, CA
  5. 2.7 5km WNW of The Geysers, CA
  6. 1.9 3km N of The Geysers, CA
  7. 1.5 3km N of The Geysers, CA
  8. 3.1 1km NNW of The Geysers, CA
  9. 1.6 1km NNW of The Geysers, CA
  10. 1.7 8km W of Cobb, CA
  11. 1.5 2km NNW of The Geysers, CA
  12. 2.0 3km WNW of Cobb, CA
  13. 1.8 15km ESE of Hidden Valley Lake, CA
  14. 2.4 4km NW of The Geysers, CA
  15. 1.6 7km WNW of Cobb, 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 470 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.