QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

6 km ENE of Brooktrails, CA

· 5.5 km deep · released about 9.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 11 kmLake County 63 kmGlenn County 80 kmColusa County 98 kmSonoma County 109 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 1.7 (md)
Depth
5.5 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 11 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 253 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 9.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 99× the energy of this one
  4. This earthquake M 1.7 about 9.6 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 39.4582, -123.3145. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 11 km (7 mi) ENE of here earthquakes near Mendocino County
Lake County, CA 63 km (39 mi) NW of here earthquakes near Lake County
Glenn County, CA 80 km (50 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 98 km (61 mi) WNW of here earthquakes near Colusa County
Sonoma County, CA 109 km (68 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

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

  1. 2.2 12 km SSE of Laytonville, CA
  2. 1.7 3 km SSE of Redwood Valley, CA
  3. 2.1 10 km NNE of Talmage, CA
  4. 2.0 3 km SSE of Redwood Valley, CA
  5. 1.9 10 km NNE of Talmage, CA
  6. 2.3 6 km SSE of Willits, CA
  7. 2.0 13 km W of Alder Springs, CA
  8. 1.8 2 km S of Redwood Valley, CA
  9. 2.1 15 km N of Brooktrails, CA
  10. 2.2 2 km S of Redwood Valley, CA
  11. 1.6 15 km N of Brooktrails, CA
  12. 1.8 5 km NW of Redwood Valley, CA
  13. 1.6 2 km S of Redwood Valley, CA
  14. 1.7 16 km SE of Laytonville, CA
  15. 1.8 3 km SSE of Redwood Valley, 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 130,000 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.