QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

34km WNW of Rancho Tehama Reserve, CA

· 13 km deep · released about 6.2 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tehama County 45 kmTrinity County 62 kmGlenn County 69 kmShasta County 89 kmMendocino County 100 kmButte County 113 kmHumboldt County 116 kmLake County 117 kmColusa County 118 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 1.5 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Tehama County, 45 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3132 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 6.2 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.5 about 6.2 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 40.1645, -122.7543. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tehama County, CA 45 km (28 mi) W of here earthquakes near Tehama County
Trinity County, CA 62 km (38 mi) SSE of here earthquakes near Trinity County
Glenn County, CA 69 km (43 mi) NNW of here earthquakes near Glenn County
Shasta County, CA 89 km (56 mi) SW of here earthquakes near Shasta County
Mendocino County, CA 100 km (62 mi) NE of here earthquakes near Mendocino County
Butte County, CA 113 km (70 mi) WNW of here earthquakes near Butte County

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

Aftershocks so far

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

  1. 1.6 20km NNW of Alder Springs, CA
  2. 2.1 20km NNW of Alder Springs, CA
  3. 1.8 19km SSE of Hayfork, CA
  4. 1.9 36km SSE of Hayfork, CA
  5. 1.6 25km W of Rancho Tehama Reserve, CA
  6. 2.3 17km ESE of Hayfork, CA
  7. 1.8 37km NNW of Alder Springs, CA
  8. 1.7 15km N of Alder Springs, CA
  9. 2.0 44km NNE of Covelo, CA
  10. 2.0 38km S of Hayfork, CA
  11. 2.1 38km S of Hayfork, CA
  12. 2.1 42km NNE of Covelo, CA
  13. 1.9 25km SE of Hayfork, CA
  14. 2.5 40km SSE of Hayfork, CA
  15. 2.3 38km SSE of Hayfork, 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.