QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

8 km SSE of Laytonville, California

· 8.0 km deep · released about 9.3 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 21 kmLake County 82 kmGlenn County 88 kmColusa County 114 kmTehama County 117 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
8.0 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 3480 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 9.3 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 3.0 100× the energy of this one
  4. This earthquake M 1.7 about 9.3 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 39.6192, -123.4298. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 21 km (13 mi) N of here earthquakes near Mendocino County
Lake County, CA 82 km (51 mi) NW of here earthquakes near Lake County
Glenn County, CA 88 km (55 mi) W of here earthquakes near Glenn County
Colusa County, CA 114 km (71 mi) WNW of here earthquakes near Colusa County
Tehama County, CA 117 km (73 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

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

  1. 1.8 9km NNE of Brooktrails, CA
  2. 1.9 12 km NE of Comptche, California
  3. 1.7 7 km WNW of Redwood Valley, California
  4. 1.8 1 km WNW of Redwood Valley, California
  5. 1.6 3 km W of Covelo, California
  6. 2.3 near the coast of Northern California
  7. 2.3 5 km WNW of Covelo, California
  8. 1.6 24 km NE of Potter Valley, California
  9. 1.7 near the coast of Northern California
  10. 1.8 1 km ESE of Redwood Valley, California
  11. 1.7 25 km SE of Covelo, California
  12. 1.7 8 km NNE of Brooktrails, California
  13. 2.0 6 km W of Redwood Valley, California
  14. 1.6 5 km WNW of Covelo, California
  15. 2.6 13 km WSW of Laytonville, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.1 on 2016-11-06 — it released about 4,000 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.