QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0md

9 km SW of Alder Springs, CA

· 8.0 km deep · released about 27 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 34 kmLake County 54 kmMendocino County 58 kmColusa County 67 kmTehama County 77 kmButte County 103 kmSutter County 113 kmSonoma County 119 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 2.0 (md)
Depth
8.0 km below the surface
Felt
no reports yet
Nearest
Glenn County, 34 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 765 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 27 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 560,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 390,000× the energy of this one
  3. Around the size people start to feel M 3.0 35× the energy of this one
  4. This earthquake M 2.0 about 27 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 39.5913, -122.8003. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 34 km (21 mi) W of here earthquakes near Glenn County
Lake County, CA 54 km (34 mi) N of here earthquakes near Lake County
Mendocino County, CA 58 km (36 mi) ENE of here earthquakes near Mendocino County
Colusa County, CA 67 km (41 mi) NW of here earthquakes near Colusa County
Tehama County, CA 77 km (48 mi) SW of here earthquakes near Tehama County
Butte County, CA 103 km (64 mi) W of here earthquakes near Butte County

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

Aftershocks so far

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

  1. 1.7 25 km NW of Alder Springs, CA
  2. 1.8 7 km NE of Brooktrails, CA
  3. 1.7 7 km E of Brooktrails, CA
  4. 1.6 25 km E of Covelo, CA
  5. 1.5 7 km ESE of Redwood Valley, CA
  6. 2.2 7 km ESE of Redwood Valley, CA
  7. 2.3 25 km N of Alder Springs, CA
  8. 2.1 23 km NNE of Alder Springs, CA
  9. 1.6 7 km E of Willits, CA
  10. 2.1 14 km SSE of Covelo, CA
  11. 2.2 14 km SSE of Covelo, CA
  12. 2.8 14 km SSE of Covelo, CA
  13. 2.1 15 km SE of Covelo, CA
  14. 1.6 14 km SSE of Covelo, CA
  15. 1.7 15 km SSE 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 5.1 on 2016-08-10 — it released about 48,000 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.