QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

17km SE of Lake Pillsbury, CA

· 9.9 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 24 kmGlenn County 47 kmColusa County 51 kmMendocino County 57 kmSonoma County 89 kmNapa County 99 kmSutter County 100 kmTehama County 102 kmYolo County 105 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
9.9 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 3174 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 39.3187, -122.7995. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 24 km (15 mi) NNW of here earthquakes near Lake County
Glenn County, CA 47 km (29 mi) SW of here earthquakes near Glenn County
Colusa County, CA 51 km (32 mi) WNW of here earthquakes near Colusa County
Mendocino County, CA 57 km (35 mi) ESE of here earthquakes near Mendocino County
Sonoma County, CA 89 km (55 mi) N of here earthquakes near Sonoma County
Napa County, CA 99 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

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

  1. 1.7 6km E of Clearlake Oaks, CA
  2. 2.1 3km SE of Redwood Valley, CA
  3. 1.6 2km SE of Redwood Valley, CA
  4. 2.9 8km E of Clearlake Oaks, CA
  5. 1.9 7km E of Clearlake Oaks, CA
  6. 1.8 8km E of Clearlake Oaks, CA
  7. 1.5 4km N of Upper Lake, CA
  8. 1.6 4km SSE of Soda Bay, CA
  9. 1.7 16km WNW of Lake Pillsbury, CA
  10. 1.8 7km ENE of Brooktrails, CA
  11. 1.9 9km SE of Lake Pillsbury, CA
  12. 2.8 16km WNW of Lake Pillsbury, CA
  13. 1.8 13km SSW of Lake Pillsbury, CA
  14. 1.6 12km S of Lake Pillsbury, CA
  15. 1.6 17km SE 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 95,000 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.