QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

12 km N of Laytonville, California

· 6.6 km deep · released about 1,100 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 41 kmGlenn County 95 kmTrinity County 99 kmLake County 99 kmHumboldt County 108 kmTehama County 112 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 3.0 (ml)
Depth
6.6 km below the surface
Felt
11 reports · strongest reported intensity III
Nearest
Mendocino County, 41 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3141 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 11 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 320,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 14,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 10,000× the energy of this one
  4. This earthquake M 3.0 about 1,100 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 39.8027, -123.4755. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 41 km (26 mi) N of here earthquakes near Mendocino County
Glenn County, CA 95 km (59 mi) WNW of here earthquakes near Glenn County
Trinity County, CA 99 km (61 mi) SSW of here earthquakes near Trinity County
Lake County, CA 99 km (62 mi) NW of here earthquakes near Lake County
Humboldt County, CA 108 km (67 mi) SSE of here earthquakes near Humboldt County
Tehama County, CA 112 km (70 mi) WSW of here earthquakes near Tehama County

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

Aftershocks so far

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

  1. 1.6 27km NNW of Covelo, CA
  2. 1.6 27km NNW of Covelo, CA
  3. 1.6 13km N of Brooktrails, CA
  4. 1.6 24km NNW of Lake Pillsbury, CA
  5. 1.8 14km WNW of Cape Vizcaino, CA
  6. 1.8 18km WNW of Brooktrails, CA
  7. 1.5 13km WSW of Laytonville, CA
  8. 1.8 20km N of Laytonville, CA
  9. 1.7 16km WNW of Lake Pillsbury, CA
  10. 1.8 7km ENE of Brooktrails, CA
  11. 2.8 16km WNW of Lake Pillsbury, CA
  12. 1.6 25km NE of Covelo, CA
  13. 1.5 6km SSE of Laytonville, CA
  14. 1.9 8km ESE of Willits, CA
  15. 2.0 7km NW of Laytonville, 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 4.1 on 2016-11-06 — it released about 35 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.