QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

12 km SSE of Lake Pillsbury, CA

· 5.5 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 27 kmMendocino County 50 kmGlenn County 51 kmColusa County 57 kmSonoma County 89 kmNapa County 103 kmTehama County 105 kmSutter County 106 kmYolo County 111 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 1.8 (md)
Depth
5.5 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Lake County, 27 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 718 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 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× the energy of this one
  4. This earthquake M 1.8 about 17 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 39.3253, -122.8758. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 27 km (17 mi) NNW of here earthquakes near Lake County
Mendocino County, CA 50 km (31 mi) ESE of here earthquakes near Mendocino County
Glenn County, CA 51 km (32 mi) SW of here earthquakes near Glenn County
Colusa County, CA 57 km (36 mi) WNW of here earthquakes near Colusa County
Sonoma County, CA 89 km (55 mi) N of here earthquakes near Sonoma County
Napa County, CA 103 km (64 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

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

  1. 1.5 9 km NNW of Redwood Valley, CA
  2. 1.5 2 km WSW of Redwood Valley, CA
  3. 1.7 6 km WNW of Redwood Valley, CA
  4. 2.9 6 km E of Willits, CA
  5. 1.5 8 km ENE of Lake Pillsbury, CA
  6. 1.8 7 km NE of Brooktrails, CA
  7. 1.8 18 km S of Talmage, CA
  8. 1.7 7 km E of Brooktrails, CA
  9. 1.5 7 km ESE of Redwood Valley, CA
  10. 1.8 11 km SSE of Talmage, CA
  11. 2.2 7 km ESE of Redwood Valley, CA
  12. 1.7 12 km WSW of Lakeport, CA
  13. 2.0 12 km W of Lakeport, CA
  14. 1.6 7 km E of Willits, CA
  15. 2.1 14 km SSE of Covelo, 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 75,000 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.