QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

33 km ENE of Covelo, CA

· 1.9 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 64 kmGlenn County 64 kmTrinity County 74 kmMendocino County 75 kmLake County 100 kmColusa County 110 kmHumboldt County 114 kmShasta 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 1.9 (md)
Depth
1.9 km below the surface
Felt
no reports yet
Nearest
Tehama County, 64 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 606 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 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 790,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 560,000× the energy of this one
  3. Around the size people start to feel M 3.0 50× the energy of this one
  4. This earthquake M 1.9 about 19 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 39.9935, -122.9592. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 64 km (40 mi) WSW of here earthquakes near Tehama County
Glenn County, CA 64 km (40 mi) NW of here earthquakes near Glenn County
Trinity County, CA 74 km (46 mi) S of here earthquakes near Trinity County
Mendocino County, CA 75 km (47 mi) NNE of here earthquakes near Mendocino County
Lake County, CA 100 km (62 mi) N of here earthquakes near Lake County
Colusa County, CA 110 km (68 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

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

  1. 1.9 39 km NE of Covelo, CA
  2. 1.7 20 km NW of Alder Springs, CA
  3. 2.1 16 km SW of Rancho Tehama Reserve, CA
  4. 1.8 16 km N of Lake Pillsbury, CA
  5. 2.0 31 km of Alder Springs, CA
  6. 1.6 13 km NNW of Alder Springs, CA
  7. 1.8 10 km ESE of Alder Springs, CA
  8. 2.4 43 km NE of Covelo, CA
  9. 2.0 31 km N of Alder Springs, CA
  10. 1.8 21 km NW of Alder Springs, CA
  11. 1.8 5 km SW of Alder Springs, CA
  12. 1.7 5 km SW of Alder Springs, CA
  13. 2.2 23 km N of Lake Pillsbury, CA
  14. 1.7 16 km N of Lake Pillsbury, CA
  15. 1.7 10 km W 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.1 on 2021-11-04 — it released about 2,100 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.