QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

4km NE of Laytonville, CA

· 7.3 km deep · released about 72 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 30 kmLake County 90 kmGlenn County 90 kmTrinity County 109 kmTehama County 114 kmHumboldt County 118 kmColusa County 120 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 2.3 (md)
Depth
7.3 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Mendocino County, 30 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1973 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 72 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 210,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 150,000× the energy of this one
  3. Around the size people start to feel M 3.0 13× the energy of this one
  4. This earthquake M 2.3 about 72 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 39.7060, -123.4497. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 30 km (19 mi) N of here earthquakes near Mendocino County
Lake County, CA 90 km (56 mi) NW of here earthquakes near Lake County
Glenn County, CA 90 km (56 mi) W of here earthquakes near Glenn County
Trinity County, CA 109 km (67 mi) SSW of here earthquakes near Trinity County
Tehama County, CA 114 km (71 mi) WSW of here earthquakes near Tehama County
Humboldt County, CA 118 km (74 mi) SSE of here earthquakes near Humboldt County

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

Aftershocks so far

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

  1. 1.6 6km S of Fort Bragg, CA
  2. 1.7 4km NW of Redwood Valley, CA
  3. 1.8 7km W of Laytonville, CA
  4. 2.4 11km W of Laytonville, CA
  5. 1.6 7km ENE of Brooktrails, CA
  6. 1.5 16km SSW of Willits, CA
  7. 1.5 8km ESE of Willits, CA
  8. 2.0 15km WNW of Lake Pillsbury, CA
  9. 1.8 8km ESE of Redway, CA
  10. 1.5 8km SSE of Laytonville, CA
  11. 1.6 11km SE of Laytonville, CA
  12. 1.6 9km NW of Redwood Valley, CA
  13. 1.6 7km ESE of Willits, CA
  14. 2.8 7km ESE of Willits, CA
  15. 2.5 7km ESE of Willits, 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 4.3 on 2019-04-29 — it released about 1,300 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.