QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

20km SW of Rancho Tehama Reserve, CA

· 28 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 38 kmTehama County 38 kmColusa County 87 kmButte County 88 kmLake County 90 kmMendocino County 91 kmTrinity County 94 kmShasta County 105 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
28 km below the surface
Felt
no reports yet
Nearest
Glenn County, 38 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3040 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 25 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 5.8 600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 420,000× the energy of this one
  3. Around the size people start to feel M 3.0 38× the energy of this one
  4. This earthquake M 1.9 about 25 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 39.9105, -122.5832. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 38 km (23 mi) NNW of here earthquakes near Glenn County
Tehama County, CA 38 km (24 mi) SW of here earthquakes near Tehama County
Colusa County, CA 87 km (54 mi) NNW of here earthquakes near Colusa County
Butte County, CA 88 km (55 mi) WNW of here earthquakes near Butte County
Lake County, CA 90 km (56 mi) N of here earthquakes near Lake County
Mendocino County, CA 91 km (56 mi) NE of here earthquakes near Mendocino County

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

Aftershocks so far

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

  1. 2.0 11km NE of Alder Springs, CA
  2. 1.6 22km NW of Alder Springs, CA
  3. 2.0 19km W of Rancho Tehama Reserve, CA
  4. 2.3 9km NE of Orland, CA
  5. 1.6 24km NE of Alder Springs, CA
  6. 1.8 34km ENE of Covelo, CA
  7. 1.8 15km NW of Alder Springs, CA
  8. 2.1 9km NW of Hamilton City, CA
  9. 2.5 20km NNW of Alder Springs, CA
  10. 1.6 20km NNW of Alder Springs, CA
  11. 2.1 20km NNW of Alder Springs, CA
  12. 1.8 6km ESE of Red Bluff, CA
  13. 1.6 25km W of Rancho Tehama Reserve, CA
  14. 2.0 8km ESE of Red Bluff, CA
  15. 2.2 10km NE of Orland, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.