QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

6km ENE of Willits, CA

· 4.2 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 14 kmLake County 58 kmGlenn County 78 kmColusa County 94 kmSonoma County 105 kmTehama 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 1.9 (md)
Depth
4.2 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 14 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3179 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 5.8 790,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 560,000× the energy of this one
  3. Around the size people start to feel M 3.0 50× 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 39.4260, -123.2843. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 14 km (8 mi) E of here earthquakes near Mendocino County
Lake County, CA 58 km (36 mi) NW of here earthquakes near Lake County
Glenn County, CA 78 km (49 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 94 km (59 mi) WNW of here earthquakes near Colusa County
Sonoma County, CA 105 km (65 mi) NNW of here earthquakes near Sonoma County
Tehama County, CA 119 km (74 mi) SW of here earthquakes near Tehama 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. 1.5 15km SSW of Willits, CA
  2. 1.6 7km N of Lake Pillsbury, CA
  3. 1.8 4km SE of Boonville, CA
  4. 2.1 3km SE of Redwood Valley, CA
  5. 1.6 2km SE of Redwood Valley, CA
  6. 1.5 4km N of Upper Lake, CA
  7. 1.7 15km SSW of Willits, CA
  8. 1.7 16km WNW of Lake Pillsbury, CA
  9. 1.8 7km ENE of Brooktrails, CA
  10. 1.9 9km SE of Lake Pillsbury, CA
  11. 2.8 16km WNW of Lake Pillsbury, CA
  12. 1.8 13km SSW of Lake Pillsbury, CA
  13. 1.6 12km S of Lake Pillsbury, CA
  14. 1.6 17km SE of Lake Pillsbury, CA
  15. 1.5 6km SSE 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 5.1 on 2016-08-10 — it released about 68,000 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.