QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

10km N of Lake Pillsbury, CA

· 12 km deep · released about 170 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 42 kmLake County 47 kmGlenn County 49 kmColusa County 71 kmTehama County 94 kmSonoma County 108 kmButte County 118 kmSutter County 120 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
12 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 42 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2998 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 170 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 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 39.4945, -122.9598. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 42 km (26 mi) E of here earthquakes near Mendocino County
Lake County, CA 47 km (29 mi) NNW of here earthquakes near Lake County
Glenn County, CA 49 km (31 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 71 km (44 mi) WNW of here earthquakes near Colusa County
Tehama County, CA 94 km (58 mi) SW of here earthquakes near Tehama County
Sonoma County, CA 108 km (67 mi) N of here earthquakes near Sonoma County

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

Aftershocks so far

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

  1. 2.5 8km ESE of Willits, CA
  2. 2.0 9km ESE of Willits, CA
  3. 2.6 9km NNE of Brooktrails, CA
  4. 2.1 12km SW of Lake Pillsbury, CA
  5. 1.8 15km NW of Alder Springs, CA
  6. 2.0 8km NNW of Redwood Valley, CA
  7. 2.2 13km ENE of Redwood Valley, CA
  8. 1.9 3km NW of Redwood Valley, CA
  9. 1.9 17km SE of Lake Pillsbury, CA
  10. 1.9 17km ESE of Lake Pillsbury, CA
  11. 1.9 8km SSE of Lake Pillsbury, CA
  12. 1.6 7km ENE of Willits, CA
  13. 2.5 20km NNW of Alder Springs, CA
  14. 1.6 20km NNW of Alder Springs, CA
  15. 2.1 20km NNW of Alder Springs, 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 7,700 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.