QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

12km NW of Laytonville, CA

· -0.9 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 37 kmLake County 102 kmGlenn County 103 kmTrinity County 108 kmHumboldt County 110 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
-0.9 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 37 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2553 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 13 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 39.7473, -123.5947. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 37 km (23 mi) NNW of here earthquakes near Mendocino County
Lake County, CA 102 km (63 mi) NW of here earthquakes near Lake County
Glenn County, CA 103 km (64 mi) W of here earthquakes near Glenn County
Trinity County, CA 108 km (67 mi) SSW of here earthquakes near Trinity County
Humboldt County, CA 110 km (69 mi) SSE of here earthquakes near Humboldt County
Tehama County, CA 124 km (77 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

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

  1. 1.8 13km SSE of Covelo, CA
  2. 1.6 20km NE of Brooktrails, CA
  3. 2.8 15km NW of Laytonville, CA
  4. 2.0 3km NNW of Redway, CA
  5. 1.6 15km W of Brooktrails, CA
  6. 2.0 15km W of Brooktrails, CA
  7. 2.0 14km SSE of Laytonville, CA
  8. 1.7 3km NNW of Redway, CA
  9. 1.9 2km NNW of Redway, CA
  10. 1.7 11km E of Rockport, CA
  11. 1.5 13km SE of Covelo, CA
  12. 1.5 9km E of Willits, CA
  13. 1.9 12km NNW of Covelo, CA
  14. 1.6 11km NNW of Covelo, CA
  15. 1.6 11km NNW of Covelo, 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 5,800 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.