QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

4km NNW of Laytonville, CA

· 12 km deep · released about 20 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 33 kmLake County 95 kmGlenn County 95 kmTrinity County 108 kmHumboldt County 115 kmTehama County 118 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
12 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 1930 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 20 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 5.8 760,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 540,000× the energy of this one
  3. Around the size people start to feel M 3.0 48× the energy of this one
  4. This earthquake M 1.9 about 20 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 39.7223, -123.5063. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 33 km (20 mi) N of here earthquakes near Mendocino County
Lake County, CA 95 km (59 mi) NW of here earthquakes near Lake County
Glenn County, CA 95 km (59 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 115 km (72 mi) SSE of here earthquakes near Humboldt County
Tehama County, CA 118 km (73 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 12km SE of Covelo, CA
  2. 2.3 14km SE of Rockport, CA
  3. 1.7 10km NNW of Redwood Valley, CA
  4. 2.3 22km N of Lake Pillsbury, CA
  5. 2.1 6km SW of Laytonville, CA
  6. 1.6 14km NNE of Brooktrails, CA
  7. 1.7 10km NNW of Redwood Valley, CA
  8. 1.5 8km NNW of Laytonville, CA
  9. 2.3 8km NW of Laytonville, CA
  10. 2.4 22km N of Laytonville, CA
  11. 1.8 7km ENE of Brooktrails, CA
  12. 1.9 7km NW of Laytonville, CA
  13. 1.8 0km SW of Laytonville, CA
  14. 1.5 13km N of Brooktrails, CA
  15. 2.8 11km NE 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 4,600 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.