QuakeIndex

Earthquake · reviewed by a seismologist

M 4.2mw

1km WSW of The Geysers, CA

· 3.1 km deep · released about 25 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 31 kmLake County 37 kmNapa County 49 kmColusa County 64 kmYolo County 76 kmMarin County 80 kmSolano County 91 kmMendocino County 94 kmSutter County 96 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 4.2 (mw)
Depth
3.1 km below the surface
Felt
146 reports · strongest reported intensity IV
Measured shaking
intensity VI (ShakeMap)
USGS impact alert
green
Nearest
Sonoma County, 31 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2444 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 146 people have reported feeling it to USGS.

How big was it?

This earthquake released about 25 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 6,700× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 300× the energy of this one
  3. Magna, Utah 2020 M 5.7 210× the energy of this one
  4. This earthquake M 4.2 about 25 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 53× 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 38.7750, -122.7670. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 31 km (19 mi) NNE of here earthquakes near Sonoma County
Lake County, CA 37 km (23 mi) S of here earthquakes near Lake County
Napa County, CA 49 km (30 mi) NW of here earthquakes near Napa County
Colusa County, CA 64 km (40 mi) SW of here earthquakes near Colusa County
Yolo County, CA 76 km (47 mi) W of here earthquakes near Yolo County
Marin County, CA 80 km (50 mi) N of here earthquakes near Marin 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 3km NNW of The Geysers, CA
  2. 1.5 3km W of Anderson Springs, CA
  3. 2.0 3km W of Anderson Springs, CA
  4. 1.9 4km WNW of The Geysers, CA
  5. 1.8 5km NW of The Geysers, CA
  6. 1.5 1km E of The Geysers, CA
  7. 1.6 6km WNW of The Geysers, CA
  8. 2.7 6km NW of The Geysers, CA
  9. 1.8 2km N of The Geysers, CA
  10. 1.6 7km NW of The Geysers, CA
  11. 1.8 7km W of Cobb, CA
  12. 1.6 2km SW of Cobb, CA
  13. 1.9 10km WNW of Cobb, CA
  14. 1.6 10km WNW of Cobb, CA
  15. 2.1 10km 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 19 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.