QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3mw

10 km N of Cloverdale, California

· 4.2 km deep · released about 1.2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 32 kmSonoma County 42 kmMendocino County 70 kmColusa County 73 kmNapa County 73 kmGlenn County 94 kmMarin County 97 kmYolo County 98 kmSutter County 113 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 3.3 (mw)
Depth
4.2 km below the surface
Felt
43 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Lake County, 32 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3330 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 43 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 140,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 6,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,600× the energy of this one
  4. This earthquake M 3.3 about 1.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.5× 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 38.9013, -123.0018. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 32 km (20 mi) SW of here earthquakes near Lake County
Sonoma County, CA 42 km (26 mi) N of here earthquakes near Sonoma County
Mendocino County, CA 70 km (44 mi) SSE of here earthquakes near Mendocino County
Colusa County, CA 73 km (45 mi) WSW of here earthquakes near Colusa County
Napa County, CA 73 km (45 mi) NW of here earthquakes near Napa County
Glenn County, CA 94 km (58 mi) SSW of here earthquakes near Glenn 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. 1.7 9 km WNW of Cobb, California
  2. 2.4 9 km WNW of Cobb, California
  3. 2.4 4 km WSW of Cobb, California
  4. 1.5 8 km WSW of Cobb, California
  5. 1.8 6 km W of Cobb, California
  6. 2.1 5 km SW of Cobb, California
  7. 1.5 8 km WSW of Cobb, California
  8. 1.5 4 km SSW of Cobb, CA
  9. 1.6 8 km W of Cobb, California
  10. 1.9 Northern California
  11. 1.9 4 km N of Healdsburg, California
  12. 1.6 8 km S of Cobb, California
  13. 1.8 8 km W of Cobb, California
  14. 1.9 8 km W of Cobb, California
  15. 1.5 17 km NE of Upper Lake, California

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 420 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.