QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0md

11km NE of Alder Springs, CA

· 14 km deep · released about 31 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 25 kmTehama County 56 kmLake County 70 kmColusa County 71 kmMendocino County 76 kmButte County 90 kmTrinity County 109 kmSutter County 112 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
14 km below the surface
Felt
no reports yet
Nearest
Glenn County, 25 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2743 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 31 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 5.8 480,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 340,000× the energy of this one
  3. Around the size people start to feel M 3.0 31× the energy of this one
  4. This earthquake M 2.0 about 31 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 39.7305, -122.6463. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 25 km (16 mi) NW of here earthquakes near Glenn County
Tehama County, CA 56 km (35 mi) SW of here earthquakes near Tehama County
Lake County, CA 70 km (43 mi) N of here earthquakes near Lake County
Colusa County, CA 71 km (44 mi) NNW of here earthquakes near Colusa County
Mendocino County, CA 76 km (47 mi) ENE of here earthquakes near Mendocino County
Butte County, CA 90 km (56 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

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

  1. 2.9 15km N of Lake Pillsbury, CA
  2. 1.9 21km W of Rancho Tehama Reserve, CA
  3. 1.7 8km ENE of Covelo, CA
  4. 1.9 19km NNW of Alder Springs, CA
  5. 1.8 20km NNW of Alder Springs, CA
  6. 2.4 14km NW of Alder Springs, CA
  7. 1.8 23km WNW of Alder Springs, CA
  8. 2.1 6km N of Lake Pillsbury, CA
  9. 1.9 18km NE of Upper Lake, CA
  10. 1.8 16km NW of Alder Springs, CA
  11. 1.8 8km N of Lake Pillsbury, CA
  12. 1.6 1km ENE of Lake Pillsbury, CA
  13. 2.4 8km N of Lake Pillsbury, CA
  14. 1.6 9km SSE of Lake Pillsbury, CA
  15. 1.6 24km W of Rancho Tehama Reserve, 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 42,000 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.