QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

6 km SE of Cottonwood, California

· 19 km deep · released about 40 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yolo County 8 kmNapa County 37 kmSolano County 38 kmSutter County 51 kmSacramento County 53 kmColusa County 69 kmContra Costa County 77 kmSonoma County 88 kmYuba County 89 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 2.1 (md)
Depth
19 km below the surface
Felt
no reports yet
Nearest
Yolo County, 8 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3516 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 40 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 380,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 270,000× the energy of this one
  3. Around the size people start to feel M 3.0 24× the energy of this one
  4. This earthquake M 2.1 about 40 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 38.6125, -121.9215. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Yolo County, CA 8 km (5 mi) SSW of here earthquakes near Yolo County
Napa County, CA 37 km (23 mi) ENE of here earthquakes near Napa County
Solano County, CA 38 km (24 mi) N of here earthquakes near Solano County
Sutter County, CA 51 km (32 mi) SSW of here earthquakes near Sutter County
Sacramento County, CA 53 km (33 mi) WNW of here earthquakes near Sacramento County
Colusa County, CA 69 km (43 mi) SSE of here earthquakes near Colusa County

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

Aftershocks so far

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

  1. 2.6 13 km E of Angwin, California
  2. 2.6 5 km S of Monument Hills, California
  3. 1.9 13 km ESE of Hidden Valley Lake, California
  4. 1.9 4 km WNW of Moskowite Corner, California
  5. 1.5 4 km WSW of Moskowite Corner, California
  6. 1.5 0 km SE of Green Valley, California
  7. 2.5 5 km S of Monument Hills, California
  8. 1.5 13 km NE of Rutherford, California
  9. 1.5 2 km E of Saint Helena, California
  10. 2.1 12 km ESE of Elmira, California
  11. 2.2 6 km WSW of Moskowite Corner, California
  12. 2.0 14 km NNW of Moskowite Corner, California
  13. 2.3 14 km E of Angwin, California
  14. 1.6 Northern California
  15. 1.8 14 km E of Angwin, California

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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.