QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

5 km NNE of Windsor, CA

· 8.3 km deep · released about 7.3 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 14 kmNapa County 42 kmLake County 58 kmMarin County 60 kmYolo County 78 kmColusa County 81 kmSolano County 83 kmSan Francisco County 98 kmContra Costa 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 1.6 (md)
Depth
8.3 km below the surface
Felt
no reports yet
Nearest
Sonoma County, 14 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1115 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 7.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,500,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.3 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 38.5890, -122.7938. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 14 km (8 mi) ENE of here earthquakes near Sonoma County
Napa County, CA 42 km (26 mi) WNW of here earthquakes near Napa County
Lake County, CA 58 km (36 mi) S of here earthquakes near Lake County
Marin County, CA 60 km (37 mi) N of here earthquakes near Marin County
Yolo County, CA 78 km (48 mi) W of here earthquakes near Yolo County
Colusa County, CA 81 km (50 mi) SW of here earthquakes near Colusa County

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

Aftershocks so far

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

  1. 1.5 12 km SE of Middletown, CA
  2. 1.5 12 km SE of Middletown, CA
  3. 2.4 12 km SE of Middletown, CA
  4. 1.8 12 km SE of Middletown, CA
  5. 1.9 7 km W of Cobb, CA
  6. 2.0 1 km NE of The Geysers, CA
  7. 1.6 6 km NW of The Geysers, CA
  8. 1.9 12 km SE of Middletown, CA
  9. 1.6 14 km NNE of Angwin, CA
  10. 1.9 6 km WNW of The Geysers, CA
  11. 1.6 12 km SE of Middletown, CA
  12. 1.6 12 km SE of Middletown, CA
  13. 1.8 12 km SE of Middletown, CA
  14. 1.5 3 km E of The Geysers, CA
  15. 1.6 4 km WNW of Cobb, 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 5.0 on 2016-12-14 — it released about 130,000 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.