QuakeIndex

Earthquake · automatic estimate, may change

M 1.8md

6 km NNW of Inverness, CA

· 20 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marin County 16 kmSonoma County 42 kmSan Francisco County 48 kmNapa County 63 kmSolano County 84 kmContra Costa County 85 kmSan Mateo County 93 kmAlameda County 102 kmYolo County 104 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 1.8 (md)
Depth
20 km below the surface
Felt
1 report
Nearest
Marin County, 16 km SE
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 274 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 38.1460, -122.8830. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marin County, CA 16 km (10 mi) NW of here earthquakes near Marin County
Sonoma County, CA 42 km (26 mi) S of here earthquakes near Sonoma County
San Francisco County, CA 48 km (30 mi) NNE of here earthquakes near San Francisco County
Napa County, CA 63 km (39 mi) SW of here earthquakes near Napa County
Solano County, CA 84 km (52 mi) W of here earthquakes near Solano County
Contra Costa County, CA 85 km (53 mi) WNW 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

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

  1. 1.8 7 km W of Saint Helena, CA
  2. 1.8 8 km W of Saint Helena, CA
  3. 1.9 4 km ESE of Santa Rosa, CA
  4. 1.6 4 km ESE of Santa Rosa, CA
  5. 2.7 3 km ESE of Santa Rosa, CA
  6. 3.3 3 km ESE of Larkfield-Wikiup, CA
  7. 1.8 6 km ESE of Santa Rosa, CA
  8. 1.7 5 km W of Glen Ellen, CA
  9. 2.1 7 km W of Kenwood, CA
  10. 1.5 7 km E of Santa Venetia, CA
  11. 2.2 7 km ESE of Roseland, CA
  12. 1.5 8 km WSW of Cotati, CA
  13. 1.6 6 km WSW of Kenwood, CA
  14. 2.3 6 km W of Yountville, CA
  15. 1.6 9 km E of Larkfield-Wikiup, 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 7,700 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.