QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

30km NE of Covelo, CA

· -0.5 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 61 kmTehama County 65 kmMendocino County 71 kmTrinity County 79 kmLake County 95 kmColusa County 106 kmHumboldt County 118 kmShasta County 119 kmButte County 120 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
-0.5 km below the surface
Felt
no reports yet
Nearest
Glenn County, 61 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2626 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 10 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 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× the energy of this one
  4. This earthquake M 1.7 about 10 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 39.9487, -122.9577. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 61 km (38 mi) NW of here earthquakes near Glenn County
Tehama County, CA 65 km (40 mi) WSW of here earthquakes near Tehama County
Mendocino County, CA 71 km (44 mi) NE of here earthquakes near Mendocino County
Trinity County, CA 79 km (49 mi) S of here earthquakes near Trinity County
Lake County, CA 95 km (59 mi) N of here earthquakes near Lake County
Colusa County, CA 106 km (66 mi) NW of here earthquakes near Colusa County

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

Aftershocks so far

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

  1. 2.4 9km W of Covelo, CA
  2. 1.8 13km SSE of Covelo, CA
  3. 1.6 20km NE of Brooktrails, CA
  4. 1.6 24km NW of Alder Springs, CA
  5. 2.6 23km NW of Alder Springs, CA
  6. 1.6 30km NNW of Alder Springs, CA
  7. 1.8 27km ENE of Covelo, CA
  8. 2.1 30km NNW of Alder Springs, CA
  9. 1.5 13km SE of Covelo, CA
  10. 1.9 12km NNW of Covelo, CA
  11. 1.6 11km NNW of Covelo, CA
  12. 1.6 11km NNW of Covelo, CA
  13. 1.6 13km WNW of Alder Springs, CA
  14. 1.6 16km N of Lake Pillsbury, CA
  15. 1.9 5km NNE of Alder Springs, 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.

On USGS

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