QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1mw

6km NW of The Geysers, CA

· 1.2 km deep · released about 23 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 33 kmSonoma County 34 kmNapa County 53 kmColusa County 63 kmYolo County 79 kmMarin County 85 kmMendocino County 88 kmGlenn County 94 kmSolano 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 4.1 (mw)
Depth
1.2 km below the surface
Felt
83 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Nearest
Lake County, 33 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2656 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 83 people have reported feeling it to USGS.

How big was it?

This earthquake released about 23 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 7,400× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 330× the energy of this one
  3. Magna, Utah 2020 M 5.7 230× the energy of this one
  4. This earthquake M 4.1 about 23 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 48× 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 38.8148, -122.7992. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 33 km (20 mi) S of here earthquakes near Lake County
Sonoma County, CA 34 km (21 mi) NNE of here earthquakes near Sonoma County
Napa County, CA 53 km (33 mi) NW of here earthquakes near Napa County
Colusa County, CA 63 km (39 mi) SW of here earthquakes near Colusa County
Yolo County, CA 79 km (49 mi) W of here earthquakes near Yolo County
Marin County, CA 85 km (53 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

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

  1. 1.5 6km NW of The Geysers, CA
  2. 2.9 6km NW of The Geysers, CA
  3. 2.5 6km NW of The Geysers, CA
  4. 2.2 6km NW of The Geysers, CA
  5. 2.3 7km WNW of The Geysers, CA
  6. 1.8 6km NW of The Geysers, CA
  7. 1.9 8km W of Cobb, CA
  8. 1.7 6km NW of The Geysers, CA
  9. 2.0 5km W of Cobb, CA
  10. 1.9 6km NW of The Geysers, CA
  11. 1.5 2km NE of The Geysers, CA
  12. 1.5 10km WNW of The Geysers, CA
  13. 1.9 5km WNW of Cobb, CA
  14. 2.9 5km WNW of Cobb, CA
  15. 1.9 2km ENE 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 22 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.