QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

13 km NE of Napa, CA

· 6.7 km deep · released about 6.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 18 kmSolano County 25 kmYolo County 41 kmContra Costa County 56 kmMarin County 62 kmSonoma County 66 kmSacramento County 73 kmSutter County 83 kmAlameda County 86 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
6.7 km below the surface
Felt
no reports yet
Nearest
Napa County, 18 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 266 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 6.6 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 2,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.6 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 38.3867, -122.1840. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 18 km (11 mi) SE of here earthquakes near Napa County
Solano County, CA 25 km (16 mi) WNW of here earthquakes near Solano County
Yolo County, CA 41 km (25 mi) SW of here earthquakes near Yolo County
Contra Costa County, CA 56 km (35 mi) NNW of here earthquakes near Contra Costa County
Marin County, CA 62 km (38 mi) NE of here earthquakes near Marin County
Sonoma County, CA 66 km (41 mi) ESE of here earthquakes near Sonoma County

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

Aftershocks so far

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

  1. 2.5 10 km ESE of Black Point-Green Point, CA
  2. 1.7 6 km ENE of Vallejo, CA
  3. 2.0 6 km SE of Napa, CA
  4. 1.8 6 km ENE of Vallejo, CA
  5. 2.2 9 km N of Bay Point, CA
  6. 1.9 3 km NNW of Pittsburg, CA
  7. 1.7 5 km S of Calistoga, CA
  8. 1.6 1 km N of Pleasant Hill, CA
  9. 1.9 2 km NE of Santa Rosa, CA
  10. 1.6 4 km ENE of Saint Helena, CA
  11. 2.6 12 km SE of Middletown, CA
  12. 1.6 12 km E of Yountville, CA
  13. 1.8 4 km SSW of Yountville, CA
  14. 1.8 4 km SSW of Yountville, CA
  15. 1.6 1 km WSW of Pittsburg, 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.