QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

10km WSW of Laytonville, CA

· 4.5 km deep · released about 17 lb of TNT

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10 km30 km60 km120 km N Mendocino County 30 kmLake County 96 kmGlenn County 103 kmTrinity County 116 kmHumboldt County 119 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
4.5 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 30 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1524 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 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 39.6695, -123.6003. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 30 km (18 mi) NNW of here earthquakes near Mendocino County
Lake County, CA 96 km (60 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 116 km (72 mi) SSW of here earthquakes near Trinity County
Humboldt County, CA 119 km (74 mi) SSE of here earthquakes near Humboldt County
Tehama County, CA 127 km (79 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

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

  1. 1.9 5km E of Covelo, CA
  2. 1.8 4km E of Covelo, CA
  3. 1.5 4km SW of Brooktrails, CA
  4. 1.7 12km N of Brooktrails, CA
  5. 1.6 18km NW of Lake Pillsbury, CA
  6. 1.6 9km E of Willits, CA
  7. 2.0 10km SSE of Willits, CA
  8. 1.5 8km NE of Brooktrails, CA
  9. 1.8 8km NE of Brooktrails, CA
  10. 2.5 5km E of Covelo, CA
  11. 1.9 5km ESE of Redway, CA
  12. 1.6 5km E of Covelo, CA
  13. 1.8 5km ENE of Covelo, CA
  14. 1.6 4km NW of Laytonville, CA
  15. 2.8 5km E 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 2019-04-29 — 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.