QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

13km WSW of Willits, CA

· 6.6 km deep · released about 140 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 10 kmLake County 69 kmGlenn County 97 kmSonoma County 103 kmColusa County 109 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 2.4 (md)
Depth
6.6 km below the surface
Felt
6 reports · strongest reported intensity III
Nearest
Mendocino County, 10 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1653 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 6 people have reported feeling it to USGS.

How big was it?

This earthquake released about 140 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 78,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.9× the energy of this one
  4. This earthquake M 2.4 about 140 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 39.3462, -123.4873. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 10 km (6 mi) SSW of here earthquakes near Mendocino County
Lake County, CA 69 km (43 mi) WNW of here earthquakes near Lake County
Glenn County, CA 97 km (61 mi) WSW of here earthquakes near Glenn County
Sonoma County, CA 103 km (64 mi) NNW of here earthquakes near Sonoma County
Colusa County, CA 109 km (68 mi) W of here earthquakes near Colusa County
Napa County, CA 137 km (85 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

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

  1. 1.8 5km N of Lake Pillsbury, CA
  2. 2.3 10km NNW of Lake Pillsbury, CA
  3. 1.8 10km WSW of Laytonville, CA
  4. 2.2 12km SSE of Laytonville, CA
  5. 1.7 8km SSE of Laytonville, CA
  6. 1.8 9km ENE of Brooktrails, CA
  7. 1.7 9km SSE of Laytonville, CA
  8. 1.6 10km NNW of Redwood Valley, CA
  9. 1.6 14km NW of Brooktrails, CA
  10. 2.1 10km SW of Laytonville, CA
  11. 1.6 12km SSE of Laytonville, CA
  12. 1.7 16km NW of Lake Pillsbury, CA
  13. 1.8 9km SE of Talmage, CA
  14. 1.7 4km E of Willits, CA
  15. 1.6 15km NW of Lake Pillsbury, 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 4.4 on 2020-12-06 — it released about 840 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.