QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

9km WSW of Williams, CA

· -0.5 km deep · released about 41 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Colusa County 5 kmLake County 43 kmSutter County 49 kmGlenn County 54 kmYolo County 59 kmNapa County 70 kmYuba County 80 kmButte County 81 kmSonoma 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
-0.5 km below the surface
Felt
no reports yet
Nearest
Colusa County, 5 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1646 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 41 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 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 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 39.1338, -122.2537. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Colusa County, CA 5 km (3 mi) SSW of here earthquakes near Colusa County
Lake County, CA 43 km (26 mi) E of here earthquakes near Lake County
Sutter County, CA 49 km (30 mi) WNW of here earthquakes near Sutter County
Glenn County, CA 54 km (33 mi) SSE of here earthquakes near Glenn County
Yolo County, CA 59 km (37 mi) NNW of here earthquakes near Yolo County
Napa County, CA 70 km (43 mi) N of here earthquakes near Napa County

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

Aftershocks so far

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

  1. 2.1 10km W of Willows, CA
  2. 1.5 9km ENE of Hidden Valley Lake, CA
  3. 1.9 10km ENE of Hidden Valley Lake, CA
  4. 1.7 19km E of Clearlake, CA
  5. 1.7 9km W of Williams, CA
  6. 3.7 10km WSW of Williams, 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.

On USGS

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