QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

25 km SW of Inverness, California

· 9.2 km deep · released about 990 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Francisco County 23 kmMarin County 30 kmSonoma County 67 kmSan Mateo County 83 kmNapa County 90 kmContra Costa County 97 kmSolano County 104 kmAlameda County 105 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 3.0 (ml)
Depth
9.2 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
San Francisco County, 23 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1565 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 990 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 340,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 990 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 37.9328, -123.0533. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Francisco County, CA 23 km (14 mi) N of here earthquakes near San Francisco County
Marin County, CA 30 km (19 mi) WSW of here earthquakes near Marin County
Sonoma County, CA 67 km (42 mi) S of here earthquakes near Sonoma County
San Mateo County, CA 83 km (52 mi) NW of here earthquakes near San Mateo County
Napa County, CA 90 km (56 mi) SW of here earthquakes near Napa County
Contra Costa County, CA 97 km (60 mi) W 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

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

  1. 2.1 5km WSW of San Francisco Zoo, CA
  2. 1.8 4km SSE of Point Reyes Station, CA
  3. 1.6 6km SSW of Stinson Beach, CA
  4. 1.9 9km S of Muir Beach, CA
  5. 1.6 6km WNW of San Francisco Zoo, CA
  6. 1.7 7km NW of San Francisco Zoo, CA
  7. 2.0 7km NW of San Francisco Zoo, CA
  8. 2.3 3km WSW of Muir Beach, CA
  9. 1.8 4km WNW of San Francisco Zoo, CA
  10. 1.6 4km WNW of San Francisco Zoo, CA
  11. 1.9 19km SW of Bolinas, CA
  12. 1.6 11 km S of Muir Beach, California
  13. 1.6 8 km WNW of Broadmoor, California
  14. 2.2 7 km S of Muir Beach, California
  15. 2.9 7 km SSW of Muir Beach, 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.