QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

2km S of Bodega Bay, CA

· 9.4 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 26 kmMarin County 39 kmSan Francisco County 65 kmNapa County 67 kmLake County 92 kmSolano County 97 kmContra Costa County 106 kmYolo County 108 kmSan Mateo County 116 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 1.7 (md)
Depth
9.4 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 1529 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 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× the energy of this one
  4. This earthquake M 1.7 about 10 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 38.3117, -123.0530. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 26 km (16 mi) SSW of here earthquakes near Sonoma County
Marin County, CA 39 km (25 mi) NW of here earthquakes near Marin County
San Francisco County, CA 65 km (40 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 97 km (60 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

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

  1. 1.7 5km SE of Point Reyes Station, CA
  2. 1.5 6km NNE of Windsor, CA
  3. 3.6 9km SW of Cloverdale, CA
  4. 1.6 9km SW of Calistoga, CA
  5. 2.0 12km NNW of Healdsburg, CA
  6. 1.6 6km SSW of Calistoga, CA
  7. 2.1 6km NNE of Windsor, CA
  8. 2.5 1km SSE of Larkfield-Wikiup, CA
  9. 1.5 6km NNE of Kenwood, CA
  10. 2.0 6km NNE of Windsor, CA
  11. 1.6 7km S of Calistoga, CA
  12. 1.8 7km S of Calistoga, CA
  13. 1.7 6km ESE of Healdsburg, CA
  14. 1.7 11km SW of The Geysers, 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.