QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

9 km SSE of Laytonville, California

· 7.6 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 21 kmLake County 81 kmGlenn County 88 kmColusa County 113 kmTehama County 116 kmTrinity 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 1.7 (md)
Depth
7.6 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 21 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3515 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 11 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 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 930,000× the energy of this one
  3. Around the size people start to feel M 3.0 83× the energy of this one
  4. This earthquake M 1.7 about 11 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 39.6195, -123.4242. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 21 km (13 mi) N of here earthquakes near Mendocino County
Lake County, CA 81 km (51 mi) NW of here earthquakes near Lake County
Glenn County, CA 88 km (54 mi) W of here earthquakes near Glenn County
Colusa County, CA 113 km (70 mi) WNW of here earthquakes near Colusa County
Tehama County, CA 116 km (72 mi) WSW of here earthquakes near Tehama County
Trinity County, CA 117 km (73 mi) SSW of here earthquakes near Trinity County

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

Aftershocks so far

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

  1. 1.9 26 km NNW of Covelo, California
  2. 1.8 6 km ENE of Laytonville, California
  3. 3.0 11 km WSW of Covelo, California
  4. 2.6 11 km WSW of Covelo, California
  5. 1.8 10 km SSE of Laytonville, California
  6. 2.1 1 km SW of Calpella, California
  7. 1.8 2 km SW of Calpella, California
  8. 1.7 7 km ENE of Calpella, California
  9. 1.9 27 km NNE of Potter Valley, California
  10. 2.2 21 km NE of Potter Valley, California
  11. 1.6 near the coast of Northern California
  12. 2.5 3 km SSE of Potter Valley, California
  13. 1.7 25 km SE of Covelo, California
  14. 2.1 3 km NW of Redwood Valley, California
  15. 1.9 near the coast of Northern California

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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.