QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

4km N of Inverness, CA

· 13 km deep · released about 6.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marin County 13 kmSonoma County 44 kmSan Francisco County 48 kmNapa County 62 kmSolano County 81 kmContra Costa County 82 kmSan Mateo County 90 kmAlameda County 99 kmYolo County 103 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
13 km below the surface
Felt
no reports yet
Nearest
Marin County, 13 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1682 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 6.8 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 2,200,000× 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 6.8 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 38.1338, -122.8508. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marin County, CA 13 km (8 mi) NW of here earthquakes near Marin County
Sonoma County, CA 44 km (27 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 62 km (38 mi) SW of here earthquakes near Napa County
Solano County, CA 81 km (50 mi) W of here earthquakes near Solano County
Contra Costa County, CA 82 km (51 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

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

  1. 2.6 6km ESE of Santa Rosa, CA
  2. 1.7 10km WNW of San Francisco Zoo, CA
  3. 1.6 6km E of Santa Venetia, CA
  4. 1.8 3km SSW of Larkfield-Wikiup, CA
  5. 1.7 5km SE of Point Reyes Station, CA
  6. 1.7 4km WSW of Yountville, CA
  7. 1.6 9km SW of Calistoga, CA
  8. 1.6 6km SSW of Calistoga, CA
  9. 2.5 1km SSE of Larkfield-Wikiup, CA
  10. 1.5 6km NNE of Kenwood, CA
  11. 2.6 8km WSW of Muir Beach, CA
  12. 1.6 7km S of Calistoga, CA
  13. 1.8 7km S of Calistoga, CA
  14. 1.8 5km SW of Yountville, CA
  15. 1.5 1km NNW 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.