QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

10 km NNE of Brooktrails, CA

· 10 km deep · released about 7.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 14 kmLake County 69 kmGlenn County 80 kmColusa County 102 kmTehama County 115 kmSonoma County 117 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 1.6 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 14 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 953 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 7.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 7.8 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 39.5302, -123.3358. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 14 km (9 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 80 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 115 km (72 mi) SW of here earthquakes near Tehama County
Sonoma County, CA 117 km (73 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

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

  1. 2.1 7 km ESE of Willits, CA
  2. 1.5 8 km ESE of Willits, CA
  3. 1.7 8 km SSW of Lake Pillsbury, CA
  4. 1.7 2 km SW of Lake Pillsbury, CA
  5. 2.1 7 km ESE of Willits, CA
  6. 1.8 8 km W of Redwood Valley, CA
  7. 3.1 7 km ESE of Willits, CA
  8. 1.8 18 km of Boonville, CA
  9. 1.5 15 km SSE of Lake Pillsbury, CA
  10. 1.7 4 km W of Laytonville, CA
  11. 1.9 15 km SSE of Lake Pillsbury, CA
  12. 2.1 17 km NNE of Laytonville, CA
  13. 1.6 10 km SSE of Laytonville, CA
  14. 1.6 13 km of Laytonville, CA
  15. 1.8 19 km ENE of Rockport, 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 12,000 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.