QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

21km NNE of Nice, CA

· 11 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 19 kmColusa County 43 kmGlenn County 45 kmMendocino County 65 kmSonoma County 86 kmSutter County 91 kmNapa County 92 kmYolo County 97 kmTehama County 103 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
11 km below the surface
Felt
no reports yet
Nearest
Lake County, 19 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1272 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 13 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 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× the energy of this one
  4. This earthquake M 1.8 about 13 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 39.2780, -122.7173. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 19 km (12 mi) N of here earthquakes near Lake County
Colusa County, CA 43 km (27 mi) WNW of here earthquakes near Colusa County
Glenn County, CA 45 km (28 mi) SW of here earthquakes near Glenn County
Mendocino County, CA 65 km (40 mi) ESE of here earthquakes near Mendocino County
Sonoma County, CA 86 km (53 mi) NNE of here earthquakes near Sonoma County
Sutter County, CA 91 km (57 mi) WNW of here earthquakes near Sutter County

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

Aftershocks so far

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

  1. 1.9 13km WNW of Alder Springs, CA
  2. 1.7 12km SW of Lakeport, CA
  3. 1.5 6km W of Cobb, CA
  4. 1.7 15km SE of Lake Pillsbury, CA
  5. 1.7 8km WNW of Cobb, CA
  6. 1.7 5km WNW of Cobb, CA
  7. 1.8 5km ESE of Lake Pillsbury, CA
  8. 1.8 8km NE of Lake Pillsbury, CA
  9. 2.4 12km SE of Talmage, CA
  10. 2.2 6km SE of Lake Pillsbury, CA
  11. 1.6 10km WNW of Cobb, CA
  12. 2.4 10km WSW of Williams, CA
  13. 1.8 6km ESE of Lake Pillsbury, CA
  14. 1.8 11km ESE of Willits, CA
  15. 1.9 10km NW of The Geysers, 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 99,000 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.