QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

9 km N of Covelo, CA

· 7.5 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 52 kmGlenn County 78 kmTrinity County 87 kmTehama County 90 kmLake County 95 kmHumboldt County 110 kmColusa County 115 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
7.5 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 52 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 59 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 39.8703, -123.2395. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 52 km (32 mi) NNE of here earthquakes near Mendocino County
Glenn County, CA 78 km (48 mi) WNW of here earthquakes near Glenn County
Trinity County, CA 87 km (54 mi) S of here earthquakes near Trinity County
Tehama County, CA 90 km (56 mi) WSW of here earthquakes near Tehama County
Lake County, CA 95 km (59 mi) NNW of here earthquakes near Lake County
Humboldt County, CA 110 km (68 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

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

  1. 1.4 13 km SSE of Redway, CA
  2. 2.2 25 km NW of Alder Springs, CA
  3. 1.9 9 km ENE of Brooktrails, CA
  4. 2.0 5 km NE of Willits, CA
  5. 1.8 7 km E of Covelo, CA
  6. 1.8 10 km N of Lake Pillsbury, CA
  7. 2.6 10 km N of Lake Pillsbury, CA
  8. 1.9 10 km ENE of Rockport, CA
  9. 1.7 10 km ENE of Rockport, CA
  10. 2.7 32 km NNW of Covelo, CA
  11. 1.9 8 km N of Covelo, CA
  12. 2.6 32 km NW of Covelo, CA
  13. 1.6 41 km WNW of Rancho Tehama Reserve, CA
  14. 3.2 31 km NNW of Covelo, CA
  15. 1.8 10 km N 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 4.4 on 2026-07-11 — it released about 11,000 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.