QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0md

25km W of Alder Springs, CA

· 8.5 km deep · released about 29 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 45 kmGlenn County 53 kmLake County 66 kmTehama County 84 kmColusa County 86 kmTrinity County 110 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
8.5 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 45 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3151 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 29 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 5.8 520,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 370,000× the energy of this one
  3. Around the size people start to feel M 3.0 33× the energy of this one
  4. This earthquake M 2.0 about 29 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 39.6622, -123.0120. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 45 km (28 mi) NE of here earthquakes near Mendocino County
Glenn County, CA 53 km (33 mi) W of here earthquakes near Glenn County
Lake County, CA 66 km (41 mi) NNW of here earthquakes near Lake County
Tehama County, CA 84 km (52 mi) SW of here earthquakes near Tehama County
Colusa County, CA 86 km (53 mi) NW of here earthquakes near Colusa County
Trinity County, CA 110 km (68 mi) S of here earthquakes near Trinity County

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

Aftershocks so far

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

  1. 1.6 13km N of Brooktrails, CA
  2. 1.8 15km ESE of Lake Pillsbury, CA
  3. 1.9 15km ESE of Lake Pillsbury, CA
  4. 1.6 24km NNW of Lake Pillsbury, CA
  5. 1.6 18km NE of Upper Lake, CA
  6. 1.7 8km SE of Lake Pillsbury, CA
  7. 1.8 11km NNE of Redwood Valley, CA
  8. 3.0 19km NE of Upper Lake, CA
  9. 1.6 7km N of Lake Pillsbury, CA
  10. 1.6 32km NNW of Alder Springs, CA
  11. 1.6 19km NNW of Alder Springs, CA
  12. 1.8 20km N of Laytonville, CA
  13. 2.1 3km SE of Redwood Valley, CA
  14. 1.6 2km SE of Redwood Valley, CA
  15. 1.6 39km NE 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 45,000 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.