QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

9km NNE of Brooktrails, CA

· 9.4 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 13 kmLake County 69 kmGlenn County 81 kmColusa County 102 kmTehama County 116 kmSonoma 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
9.4 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 13 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2029 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 39.5207, -123.3407. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 13 km (8 mi) NE of here earthquakes near Mendocino County
Lake County, CA 69 km (43 mi) NW of here earthquakes near Lake County
Glenn County, CA 81 km (50 mi) W of here earthquakes near Glenn County
Colusa County, CA 102 km (64 mi) WNW of here earthquakes near Colusa County
Tehama County, CA 116 km (72 mi) SW of here earthquakes near Tehama County
Sonoma County, CA 116 km (72 mi) NNW of here earthquakes near Sonoma County

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

Aftershocks so far

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

  1. 1.5 2km WNW of Laytonville, CA
  2. 1.6 11km NNE of Boonville, CA
  3. 1.9 11km N of Covelo, CA
  4. 2.6 10km NNW of Redwood Valley, CA
  5. 1.9 8km NW of Laytonville, CA
  6. 2.0 5km WSW of Laytonville, CA
  7. 1.6 8km SSE of Laytonville, CA
  8. 1.9 13km SE of Lake Pillsbury, CA
  9. 1.7 9km NNW of Redwood Valley, CA
  10. 1.9 26km N of Laytonville, CA
  11. 2.3 26km N of Laytonville, CA
  12. 1.6 15km SE of Laytonville, CA
  13. 1.7 5km WSW of Redwood Valley, CA
  14. 1.9 5km NE of Talmage, CA
  15. 2.1 9km ESE 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 4,900 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.