QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

6km ESE of Lake Pillsbury, CA

· 8.7 km deep · released about 510 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 33 kmMendocino County 47 kmGlenn County 50 kmColusa County 61 kmSonoma County 95 kmTehama County 101 kmNapa County 109 kmSutter County 110 kmButte County 116 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 2.8 (md)
Depth
8.7 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Lake County, 33 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1232 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 510 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 30,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 21,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.9× the energy of this one
  4. This earthquake M 2.8 about 510 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 39.3788, -122.9012. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 33 km (20 mi) NNW of here earthquakes near Lake County
Mendocino County, CA 47 km (29 mi) E of here earthquakes near Mendocino County
Glenn County, CA 50 km (31 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 61 km (38 mi) WNW of here earthquakes near Colusa County
Sonoma County, CA 95 km (59 mi) N of here earthquakes near Sonoma County
Tehama County, CA 101 km (63 mi) SW of here earthquakes near Tehama County

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

Aftershocks so far

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

  1. 1.9 21km ENE of Brooktrails, CA
  2. 1.8 12km SSE of Lake Pillsbury, CA
  3. 1.7 12km W of Lake Pillsbury, CA
  4. 1.7 16km SE of Lake Pillsbury, CA
  5. 1.7 7km E of Willits, CA
  6. 2.4 11km WNW of Redwood Valley, CA
  7. 1.5 10km W of Lake Pillsbury, CA
  8. 1.6 8km SE of Willits, CA
  9. 1.5 9km NNW of Redwood Valley, CA
  10. 1.9 13km WNW of Alder Springs, CA
  11. 1.7 12km SW of Lakeport, CA
  12. 1.6 8km NE of Brooktrails, CA
  13. 1.5 7km NE of Brooktrails, CA
  14. 1.7 15km SE of Lake Pillsbury, CA
  15. 1.8 5km 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 2,500 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.