QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

14 km NNE of Lake Pillsbury, CA

· 5.5 km deep · released about 140 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 42 kmLake County 47 kmMendocino County 50 kmColusa County 66 kmTehama County 87 kmButte County 110 kmSonoma County 110 kmSutter County 114 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 2.5 (md)
Depth
5.5 km below the surface
Felt
1 report
Nearest
Glenn County, 42 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 219 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 140 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 75,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.7× the energy of this one
  4. This earthquake M 2.5 about 140 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 39.5163, -122.8737. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 42 km (26 mi) WSW of here earthquakes near Glenn County
Lake County, CA 47 km (29 mi) NNW of here earthquakes near Lake County
Mendocino County, CA 50 km (31 mi) E of here earthquakes near Mendocino County
Colusa County, CA 66 km (41 mi) NW of here earthquakes near Colusa County
Tehama County, CA 87 km (54 mi) SW of here earthquakes near Tehama County
Butte County, CA 110 km (68 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

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

  1. 2.2 16 km N of Brooktrails, CA
  2. 2.7 15 km N of Brooktrails, CA
  3. 2.1 3 km SSE of Redwood Valley, CA
  4. 1.5 4 km NW of Redwood Valley, CA
  5. 2.2 3 km SSE of Redwood Valley, CA
  6. 1.6 12 km N of Redwood Valley, CA
  7. 1.7 15 km NE of Willits, CA
  8. 2.0 9 km SSE of Lake Pillsbury, CA
  9. 1.8 9 km SSE of Lake Pillsbury, CA
  10. 2.1 8 km E of Covelo, CA
  11. 2.1 15 km SE of Laytonville, CA
  12. 1.7 16 km ESE of Lake Pillsbury, CA
  13. 2.3 17 km ESE of Lake Pillsbury, CA
  14. 1.7 15 km N of Brooktrails, CA
  15. 1.8 17 km ESE of Lake Pillsbury, 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 9,100 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.