QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

9km W of Covelo, CA

· 7.1 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 41 kmGlenn County 85 kmLake County 93 kmTrinity County 97 kmTehama County 103 kmHumboldt County 112 kmColusa County 118 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
7.1 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 41 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1686 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 12 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 5.7 900,000× the energy of this one
  3. Around the size people start to feel M 3.0 80× the energy of this one
  4. This earthquake M 1.7 about 12 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 39.7943, -123.3582. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 41 km (25 mi) N of here earthquakes near Mendocino County
Glenn County, CA 85 km (53 mi) WNW of here earthquakes near Glenn County
Lake County, CA 93 km (58 mi) NW of here earthquakes near Lake County
Trinity County, CA 97 km (60 mi) SSW of here earthquakes near Trinity County
Tehama County, CA 103 km (64 mi) WSW of here earthquakes near Tehama County
Humboldt County, CA 112 km (70 mi) SSE of here earthquakes near Humboldt County

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

Aftershocks so far

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

  1. 1.9 18km NNW of Laytonville, CA
  2. 1.8 13km N of Fort Bragg, CA
  3. 1.7 10km SE of Willits, CA
  4. 1.5 10km SE of Willits, CA
  5. 1.9 7km ENE of Covelo, CA
  6. 1.9 8km SSE of Redway, CA
  7. 1.7 10km SE of Willits, CA
  8. 1.8 9km NE of Laytonville, CA
  9. 1.5 7km SW of Willits, CA
  10. 1.6 11km N of Brooktrails, CA
  11. 1.7 24km NNW of Lake Pillsbury, CA
  12. 1.7 10km SSE of Laytonville, CA
  13. 2.0 21km NW of Alder Springs, CA
  14. 1.8 10km ENE of Covelo, CA
  15. 1.6 11km NNE of Brooktrails, 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 2017-12-14 — it released about 6,200 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.