QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

4 km NNE of Laytonville, California

· 6.1 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 33 kmGlenn County 92 kmLake County 93 kmTrinity County 107 kmTehama 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
6.1 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 33 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3516 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 19 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 5.8 810,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 580,000× the energy of this one
  3. Around the size people start to feel M 3.0 51× the energy of this one
  4. This earthquake M 1.9 about 19 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 39.7247, -123.4695. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 33 km (20 mi) N of here earthquakes near Mendocino County
Glenn County, CA 92 km (57 mi) W of here earthquakes near Glenn County
Lake County, CA 93 km (58 mi) NW of here earthquakes near Lake County
Trinity County, CA 107 km (66 mi) SSW of here earthquakes near Trinity County
Tehama County, CA 115 km (71 mi) WSW of here earthquakes near Tehama County
Humboldt County, CA 116 km (72 mi) SSE of here earthquakes near Humboldt 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. 1.9 27 km NNE of Potter Valley, California
  2. 1.6 near the coast of Northern California
  3. 1.7 25 km SE of Covelo, California
  4. 1.9 near the coast of Northern California
  5. 1.8 8 km SSE of Laytonville, California
  6. 1.9 5 km E of Laytonville, California
  7. 1.8 29 km ENE of Covelo, California
  8. 2.0 12 km WSW of Laytonville, California
  9. 2.2 13 km WSW of Laytonville, California
  10. 1.7 5 km E of Covelo, California
  11. 1.8 17 km NE of Willits, California
  12. 2.1 14 km WSW of Laytonville, California
  13. 1.8 4 km NE of Benbow, California
  14. 2.0 near the coast of Northern California
  15. 2.0 13 km WSW of Laytonville, California

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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.