QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

12km WNW of Covelo, CA

· 4.9 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 46 kmGlenn County 87 kmTrinity County 92 kmLake County 98 kmTehama County 102 kmHumboldt County 107 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
4.9 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Mendocino County, 46 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2180 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

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 39.8463, -123.3683. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 46 km (29 mi) N of here earthquakes near Mendocino County
Glenn County, CA 87 km (54 mi) WNW of here earthquakes near Glenn County
Trinity County, CA 92 km (57 mi) SSW of here earthquakes near Trinity County
Lake County, CA 98 km (61 mi) NNW of here earthquakes near Lake County
Tehama County, CA 102 km (63 mi) WSW of here earthquakes near Tehama County
Humboldt County, CA 107 km (66 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

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

  1. 1.8 11km NW of Covelo, CA
  2. 1.8 13km NNE of Brooktrails, CA
  3. 1.6 7km ENE of Laytonville, CA
  4. 2.0 12km SE of Laytonville, CA
  5. 1.5 7km NE of Laytonville, CA
  6. 1.7 12km SE of Laytonville, CA
  7. 1.6 10km NNE of Brooktrails, CA
  8. 1.6 11km SE of Laytonville, CA
  9. 1.8 12km SE of Laytonville, CA
  10. 2.3 12km NNW of Covelo, CA
  11. 3.0 20km NNE of Rockport, CA
  12. 2.1 20km NNE of Rockport, CA
  13. 1.8 4km N of Laytonville, CA
  14. 1.6 14km SSE of Covelo, CA
  15. 1.6 8km WSW of Covelo, 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 7,200 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.