QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

7km ENE of Laytonville, CA

· 8.5 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 31 kmGlenn County 87 kmLake County 88 kmTrinity County 107 kmTehama County 111 kmColusa County 117 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
8.5 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 31 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1710 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 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× 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 39.7113, -123.4098. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 31 km (19 mi) N of here earthquakes near Mendocino County
Glenn County, CA 87 km (54 mi) W of here earthquakes near Glenn County
Lake County, CA 88 km (55 mi) NW of here earthquakes near Lake County
Trinity County, CA 107 km (67 mi) SSW of here earthquakes near Trinity County
Tehama County, CA 111 km (69 mi) WSW of here earthquakes near Tehama County
Colusa County, CA 117 km (73 mi) WNW of here earthquakes near Colusa County

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

Aftershocks so far

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

  1. 2.4 13km WSW of Willits, CA
  2. 1.8 9km NNW of Redwood Valley, CA
  3. 1.7 9km SE of Willits, CA
  4. 1.6 9km SE of Willits, CA
  5. 1.9 10km NW of Laytonville, CA
  6. 2.0 18km SW of Willits, CA
  7. 2.0 17km NNW of Covelo, CA
  8. 2.3 6km NW of Redwood Valley, CA
  9. 1.7 7km NE of Willits, CA
  10. 2.0 7km NNW of Redwood Valley, CA
  11. 1.6 30km NW of Covelo, CA
  12. 1.8 30km NW of Covelo, CA
  13. 1.9 18km SW of Willits, CA
  14. 1.9 13km WNW of Alder Springs, CA
  15. 1.8 14km NE 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 5,200 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.