QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

2km SSW of Bodega Bay, CA

· 10 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 26 kmMarin County 40 kmSan Francisco County 66 kmNapa County 67 kmLake County 92 kmSolano County 98 kmContra Costa County 106 kmYolo County 108 kmSan Mateo County 117 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
10 km below the surface
Felt
no reports yet
Nearest
Sonoma County, 26 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1855 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 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 38.3192, -123.0555. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 26 km (16 mi) SSW of here earthquakes near Sonoma County
Marin County, CA 40 km (25 mi) NW of here earthquakes near Marin County
San Francisco County, CA 66 km (41 mi) N of here earthquakes near San Francisco County
Napa County, CA 67 km (42 mi) WSW of here earthquakes near Napa County
Lake County, CA 92 km (57 mi) SSW of here earthquakes near Lake County
Solano County, CA 98 km (61 mi) W of here earthquakes near Solano County

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

Aftershocks so far

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

  1. 1.9 8km NE of Windsor, CA
  2. 1.6 4km N of Inverness, CA
  3. 1.6 5km NE of Larkfield-Wikiup, CA
  4. 1.5 6km W of Kenwood, CA
  5. 1.7 5km NE of Larkfield-Wikiup, CA
  6. 1.6 7km WSW of Lagunitas-Forest Knolls, CA
  7. 1.7 4km NNW of Larkfield-Wikiup, CA
  8. 2.1 8km SW of Calistoga, CA
  9. 2.5 7km SW of Calistoga, CA
  10. 1.9 6km NNE of Windsor, CA
  11. 1.9 10km ENE of Healdsburg, CA
  12. 2.4 4km S of Dillon Beach, CA
  13. 1.8 3km S of Dillon Beach, CA
  14. 1.6 7km E of Penngrove, CA
  15. 2.0 7km W of Kenwood, 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.