QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

9km NNE of Laytonville, CA

· 4.1 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 38 kmGlenn County 93 kmLake County 96 kmTrinity County 102 kmHumboldt County 111 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 1.8 (md)
Depth
4.1 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 38 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3112 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 39.7705, -123.4612. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 38 km (23 mi) N of here earthquakes near Mendocino County
Glenn County, CA 93 km (58 mi) WNW of here earthquakes near Glenn County
Lake County, CA 96 km (60 mi) NW of here earthquakes near Lake County
Trinity County, CA 102 km (63 mi) SSW of here earthquakes near Trinity County
Humboldt County, CA 111 km (69 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

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

  1. 1.9 4km ESE of Redway, CA
  2. 1.6 14km SE of Laytonville, CA
  3. 2.0 2km ENE of Redway, CA
  4. 2.2 5km N of Fort Bragg, CA
  5. 1.6 7km SSW of Laytonville, CA
  6. 1.5 1km ENE of Redway, CA
  7. 2.1 13km NNE of Rockport, CA
  8. 1.6 5km NW of Laytonville, CA
  9. 1.9 13km N of Brooktrails, CA
  10. 1.8 7km ENE of Covelo, CA
  11. 1.8 28km SE of Redway, CA
  12. 2.0 37km NNE of Covelo, CA
  13. 1.6 20km N of Covelo, CA
  14. 2.4 4km NNW of Laytonville, CA
  15. 1.6 7km SW 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 4.3 on 2017-12-14 — it released about 5,400 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.