QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

11 km NE of Redwood Valley, CA

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

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 30 kmLake County 41 kmGlenn County 68 kmColusa County 78 kmSonoma County 92 kmNapa County 115 kmTehama County 116 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
7.7 km below the surface
Felt
77 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Mendocino County, 30 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 932 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 77 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 39.3358, -123.1167. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 30 km (19 mi) ESE of here earthquakes near Mendocino County
Lake County, CA 41 km (25 mi) NW of here earthquakes near Lake County
Glenn County, CA 68 km (42 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 78 km (48 mi) WNW of here earthquakes near Colusa County
Sonoma County, CA 92 km (57 mi) N of here earthquakes near Sonoma County
Napa County, CA 115 km (71 mi) NW of here earthquakes near Napa County

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

Aftershocks so far

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

  1. 1.7 11 km NE of Talmage, CA
  2. 1.6 10 km N of Cloverdale, CA
  3. 1.6 2 km SSW of Redwood Valley, CA
  4. 1.8 6 km SW of Boonville, CA
  5. 1.6 16 km ESE of Navarro Head, CA
  6. 1.6 5 km E of Redwood Valley, CA
  7. 1.5 11 km SE of Lake Pillsbury, CA
  8. 1.6 4 km NW of Redwood Valley, CA
  9. 1.8 14 km NW of Brooktrails, CA
  10. 1.7 6 km ESE of Lake Pillsbury, CA
  11. 1.7 5 km ESE of Lake Pillsbury, CA
  12. 1.6 8 km ENE of Brooktrails, CA
  13. 1.5 5 km SE of Redwood Valley, CA
  14. 1.8 8 km SSE of Lake Pillsbury, CA
  15. 2.6 11 km N of Brooktrails, 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 5.1 on 2016-08-10 — it released about 680 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.