QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

1 km S of Inverness, CA

· 11 km deep · released about 150 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marin County 11 kmSan Francisco County 43 kmSonoma County 49 kmNapa County 65 kmContra Costa County 82 kmSolano County 82 kmSan Mateo County 86 kmAlameda County 96 kmYolo County 106 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 2.5 (md)
Depth
11 km below the surface
Felt
4 reports · strongest reported intensity III
Nearest
Marin County, 11 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 716 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 150 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 99,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 70,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.2× the energy of this one
  4. This earthquake M 2.5 about 150 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 38.0915, -122.8563. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marin County, CA 11 km (7 mi) WNW of here earthquakes near Marin County
San Francisco County, CA 43 km (27 mi) NNE of here earthquakes near San Francisco County
Sonoma County, CA 49 km (30 mi) S of here earthquakes near Sonoma County
Napa County, CA 65 km (41 mi) SW of here earthquakes near Napa County
Contra Costa County, CA 82 km (51 mi) WNW of here earthquakes near Contra Costa County
Solano County, CA 82 km (51 mi) WSW of here earthquakes near Solano County

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

Aftershocks so far

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

  1. 1.6 3 km W of San Francisco Zoo, CA
  2. 1.6 6 km ESE of Santa Venetia, CA
  3. 1.7 7 km E of Black Point-Green Point, CA
  4. 1.8 7 km ENE of Black Point-Green Point, CA
  5. 1.5 5 km NW of American Canyon, CA
  6. 1.9 5 km NW of San Francisco Zoo, CA
  7. 1.5 6 km NW of San Francisco Zoo, CA
  8. 1.6 6 km NW of San Francisco Zoo, CA
  9. 2.9 5 km NW of San Francisco Zoo, CA
  10. 2.5 5 km NW of San Francisco Zoo, CA
  11. 2.1 5 km NW of San Francisco Zoo, CA
  12. 3.5 5 km NW of San Francisco Zoo, CA
  13. 1.8 5 km SW of Kenwood, CA
  14. 1.9 3 km ENE of Sebastopol, CA
  15. 1.9 6 km NE of Inverness, 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 760 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.