QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

12 km SSW of Lake Pillsbury, CA

· 3.4 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 31 kmMendocino County 41 kmGlenn County 61 kmColusa County 67 kmSonoma County 87 kmNapa County 106 kmTehama County 113 kmSutter County 116 kmYolo 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 1.9 (md)
Depth
3.4 km below the surface
Felt
no reports yet
Nearest
Lake County, 31 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 558 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 21 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 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 39.3028, -123.0022. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 31 km (19 mi) NW of here earthquakes near Lake County
Mendocino County, CA 41 km (25 mi) ESE of here earthquakes near Mendocino County
Glenn County, CA 61 km (38 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 67 km (42 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 106 km (66 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

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

  1. 2.5 15 km NW of Lake Pillsbury, CA
  2. 2.8 15 km NW of Lake Pillsbury, CA
  3. 1.7 6 km E of Redwood Valley, CA
  4. 1.7 6 km ESE of Boonville, CA
  5. 1.6 15 km SSE of Laytonville, CA
  6. 2.0 0 km NNW of Willits, CA
  7. 1.8 20 km ESE of Navarro Head, CA
  8. 1.9 1 km NNW of Willits, CA
  9. 2.1 1 km NNW of Willits, CA
  10. 2.7 1 km NNW of Willits, CA
  11. 3.6 1 km NNW of Willits, CA
  12. 2.1 6 km SSE of Lake Pillsbury, CA
  13. 1.5 8 km W of Redwood Valley, CA
  14. 1.8 10 km NNE of Brooktrails, CA
  15. 1.8 9 km NNW of Redwood Valley, 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 61,000 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.