QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

10km ESE of Willits, CA

· 6.8 km deep · released about 420 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 18 kmLake County 53 kmGlenn County 77 kmColusa County 90 kmSonoma County 98 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 2.8 (ml)
Depth
6.8 km below the surface
Felt
72 reports · strongest reported intensity IV
Nearest
Mendocino County, 18 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2045 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 72 people have reported feeling it to USGS.

How big was it?

This earthquake released about 420 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 36,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 26,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.3× the energy of this one
  4. This earthquake M 2.8 about 420 lb of TNT

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 39.3707, -123.2530. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 18 km (11 mi) ESE of here earthquakes near Mendocino County
Lake County, CA 53 km (33 mi) NW of here earthquakes near Lake County
Glenn County, CA 77 km (48 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 90 km (56 mi) WNW of here earthquakes near Colusa County
Sonoma County, CA 98 km (61 mi) NNW of here earthquakes near Sonoma County
Tehama County, CA 121 km (75 mi) SW of here earthquakes near Tehama 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. 1.6 5km ENE of Laytonville, CA
  2. 2.5 14km NNW of Brooktrails, CA
  3. 1.6 5km N of Lake Pillsbury, CA
  4. 1.7 12km W of Lakeport, CA
  5. 1.5 21km ENE of Navarro Head, CA
  6. 1.9 10km ESE of Redwood Valley, CA
  7. 2.0 6km ENE of Lake Pillsbury, CA
  8. 1.7 11km N of Lake Pillsbury, CA
  9. 2.6 10km ESE of Redwood Valley, CA
  10. 1.8 10km NNW of Redwood Valley, CA
  11. 2.2 11km ESE of Willits, CA
  12. 2.0 9km ESE of Redwood Valley, CA
  13. 1.8 9km ESE of Redwood Valley, CA
  14. 2.0 6km NNE of Lake Pillsbury, CA
  15. 2.2 10km NNW of Redwood Valley, 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 3,100 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.