QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

12km SE of Lake Pillsbury, CA

· 3.2 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 27 kmGlenn County 48 kmMendocino County 53 kmColusa County 55 kmSonoma County 91 kmTehama County 102 kmNapa County 103 kmSutter County 104 kmYolo County 110 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
3.2 km below the surface
Felt
no reports yet
Nearest
Lake County, 27 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1649 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 39.3427, -122.8430. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 27 km (17 mi) NNW of here earthquakes near Lake County
Glenn County, CA 48 km (30 mi) SW of here earthquakes near Glenn County
Mendocino County, CA 53 km (33 mi) E of here earthquakes near Mendocino County
Colusa County, CA 55 km (34 mi) WNW of here earthquakes near Colusa County
Sonoma County, CA 91 km (57 mi) N of here earthquakes near Sonoma County
Tehama County, CA 102 km (63 mi) SSW of here earthquakes near Tehama County

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

Aftershocks so far

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

  1. 2.2 15km WSW of Lakeport, CA
  2. 1.8 5km N of Lake Pillsbury, CA
  3. 2.3 10km NNW of Lake Pillsbury, CA
  4. 1.8 9km ENE of Brooktrails, CA
  5. 1.6 10km NNW of Redwood Valley, CA
  6. 2.2 4km ESE of Lake Pillsbury, CA
  7. 1.5 12km SW of Lakeport, CA
  8. 2.1 5km ESE of Lake Pillsbury, CA
  9. 1.5 3km N of Clearlake, CA
  10. 1.5 3km N of Clearlake, CA
  11. 1.9 22km N of Lake Pillsbury, CA
  12. 1.9 14km WNW of Alder Springs, CA
  13. 1.7 16km NW of Lake Pillsbury, CA
  14. 1.9 14km WNW of Alder Springs, CA
  15. 2.2 4km 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 86,000 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.