QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

7 km WNW of Napa, California

· 8.9 km deep · released about 7.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 21 kmSolano County 38 kmMarin County 45 kmSonoma County 54 kmYolo County 57 kmContra Costa County 58 kmAlameda County 85 kmSan Francisco County 88 kmSacramento County 90 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
8.9 km below the surface
Felt
no reports yet
Nearest
Napa County, 21 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3389 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 7.6 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 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× 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 7.6 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 38.3212, -122.3673. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 21 km (13 mi) S of here earthquakes near Napa County
Solano County, CA 38 km (23 mi) W of here earthquakes near Solano County
Marin County, CA 45 km (28 mi) NE of here earthquakes near Marin County
Sonoma County, CA 54 km (33 mi) ESE of here earthquakes near Sonoma County
Yolo County, CA 57 km (35 mi) SW of here earthquakes near Yolo County
Contra Costa County, CA 58 km (36 mi) NW of here earthquakes near Contra Costa County

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

Aftershocks so far

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

  1. 1.5 4 km NW of Angwin, California
  2. 1.8 6 km E of Santa Rosa, California
  3. 1.8 2 km W of Saint Helena, California
  4. 2.1 0 km W of Saint Helena, California
  5. 2.3 1 km W of Saint Helena, California
  6. 1.9 1 km W of Saint Helena, California
  7. 1.9 1 km W of Saint Helena, California
  8. 1.7 1 km W of Saint Helena, California
  9. 1.5 0 km WNW of Saint Helena, California
  10. 2.5 1 km N of Pleasant Hill, California
  11. 1.8 1 km NNW of Pleasant Hill, California
  12. 3.5 11 km WNW of Calistoga, California
  13. 1.7 4 km NNW of Orinda, California
  14. 1.9 4 km NNW of Orinda, California
  15. 1.5 Northern 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.