QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

14km SE of Lake Pillsbury, CA

· 5.1 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 24 kmGlenn County 51 kmMendocino County 52 kmColusa County 55 kmSonoma County 87 kmNapa County 100 kmSutter County 104 kmTehama County 105 kmYolo County 108 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
5.1 km below the surface
Felt
no reports yet
Nearest
Lake County, 24 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1299 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 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 620,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 440,000× the energy of this one
  3. Around the size people start to feel M 3.0 39× 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 39.3087, -122.8565. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 24 km (15 mi) NNW of here earthquakes near Lake County
Glenn County, CA 51 km (32 mi) SW of here earthquakes near Glenn County
Mendocino County, CA 52 km (32 mi) ESE of here earthquakes near Mendocino County
Colusa County, CA 55 km (34 mi) WNW of here earthquakes near Colusa County
Sonoma County, CA 87 km (54 mi) N of here earthquakes near Sonoma County
Napa County, CA 100 km (62 mi) NNW of here earthquakes near Napa 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. 2.0 9km NNE of Brooktrails, CA
  2. 1.7 18km WNW of Lake Pillsbury, CA
  3. 1.9 21km ENE of Brooktrails, CA
  4. 1.8 12km SSE of Lake Pillsbury, CA
  5. 1.7 12km W of Lake Pillsbury, CA
  6. 1.7 16km SE of Lake Pillsbury, CA
  7. 1.7 7km E of Willits, CA
  8. 2.4 11km WNW of Redwood Valley, CA
  9. 1.5 10km W of Lake Pillsbury, CA
  10. 1.6 8km SE of Willits, CA
  11. 1.5 9km NNW of Redwood Valley, CA
  12. 1.9 13km WNW of Alder Springs, CA
  13. 1.7 12km SW of Lakeport, CA
  14. 1.6 8km NE of Brooktrails, CA
  15. 1.5 7km NE of Brooktrails, 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 53,000 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.