QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

18 km WNW of Winters, CA

· 9.8 km deep · released about 6.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 15 kmYolo County 27 kmSolano County 38 kmSonoma County 66 kmSutter County 67 kmColusa County 69 kmSacramento County 73 kmContra Costa County 73 kmMarin County 75 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
9.8 km below the surface
Felt
no reports yet
Nearest
Napa County, 15 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 246 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 6.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.6 about 6.4 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 38.5572, -122.1707. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 15 km (9 mi) ENE of here earthquakes near Napa County
Yolo County, CA 27 km (17 mi) WSW of here earthquakes near Yolo County
Solano County, CA 38 km (24 mi) NNW of here earthquakes near Solano County
Sonoma County, CA 66 km (41 mi) E of here earthquakes near Sonoma County
Sutter County, CA 67 km (42 mi) SW of here earthquakes near Sutter County
Colusa County, CA 69 km (43 mi) S of here earthquakes near Colusa County

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

Aftershocks so far

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

  1. 1.8 5 km ENE of Vallejo, CA
  2. 1.6 9 km E of Larkfield-Wikiup, CA
  3. 1.6 8 km WSW of Calistoga, CA
  4. 2.2 4 km SE of Larkfield-Wikiup, CA
  5. 1.6 9 km WNW of Calistoga, CA
  6. 1.9 14 km NNE of Angwin, CA
  7. 2.0 13 km NNE of Angwin, CA
  8. 1.9 8 km WSW of Arbuckle, CA
  9. 2.9 2 km NNE of Middletown, CA
  10. 1.7 3 km S of Green Valley, CA
  11. 2.3 4 km SW of Green Valley, CA
  12. 2.0 10 km ESE of Hidden Valley Lake, CA
  13. 2.1 5 km WSW of Yountville, CA
  14. 2.1 6 km SE of Napa, CA
  15. 1.5 14 km ENE of Yountville, 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 4.4 on 2022-09-14 — it released about 18,000 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.