QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

11km W of Laytonville, CA

· 4.8 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 32 kmLake County 98 kmGlenn County 104 kmTrinity County 115 kmHumboldt County 116 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 1.9 (md)
Depth
4.8 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 32 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1419 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 39.6890, -123.6087. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 32 km (20 mi) NNW of here earthquakes near Mendocino County
Lake County, CA 98 km (61 mi) NW of here earthquakes near Lake County
Glenn County, CA 104 km (64 mi) W of here earthquakes near Glenn County
Trinity County, CA 115 km (71 mi) SSW of here earthquakes near Trinity County
Humboldt County, CA 116 km (72 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

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

  1. 1.7 2km E of Willits, CA
  2. 1.7 11km N of Brooktrails, CA
  3. 2.4 2km ENE of Willits, CA
  4. 2.5 15km W of Brooktrails, CA
  5. 2.4 2km ENE of Willits, CA
  6. 2.0 13km NNE of Fort Bragg, CA
  7. 1.6 7km ENE of Willits, CA
  8. 1.9 13km N of Brooktrails, CA
  9. 2.2 8km NNW of Mendocino, CA
  10. 1.9 5km NNW of Laytonville, CA
  11. 2.0 10km NW of Redwood Valley, CA
  12. 1.7 5km WSW of Laytonville, CA
  13. 2.6 18km W of Cape Vizcaino, CA
  14. 2.5 18km W of Cape Vizcaino, CA
  15. 2.3 8km NNE 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 2019-04-29 — it released about 4,300 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.