QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

9km SW of Point Reyes, CA

· 11 km deep · released about 5.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Francisco County 25 kmMarin County 31 kmSonoma County 66 kmSan Mateo County 85 kmNapa County 90 kmContra Costa County 98 kmSolano County 105 kmAlameda County 107 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 1.5 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
San Francisco County, 25 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1472 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 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.7 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 37.9468, -123.0713. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Francisco County, CA 25 km (15 mi) N of here earthquakes near San Francisco County
Marin County, CA 31 km (19 mi) WSW of here earthquakes near Marin County
Sonoma County, CA 66 km (41 mi) S of here earthquakes near Sonoma County
San Mateo County, CA 85 km (53 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 98 km (61 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

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

  1. 1.9 6 km NE of Inverness, CA
  2. 1.5 7 km NW of San Francisco Zoo, CA
  3. 1.6 2 km S of Dillon Beach, CA
  4. 1.8 4 km NW of Bodega Bay, CA
  5. 2.0 4 km WNW of Bodega Bay, CA
  6. 1.6 6 km NW of San Francisco Zoo, CA
  7. 2.5 1 km S of Inverness, CA
  8. 2.0 32 km SSW of Point Reyes, CA
  9. 2.1 8 km WNW of San Francisco Zoo, CA
  10. 1.7 7 km SSW of Muir Beach, CA
  11. 2.2 7 km SSW of Muir Beach, CA
  12. 2.0 8 km S of Muir Beach, CA
  13. 1.7 6 km WNW of San Francisco Zoo, CA
  14. 1.7 6 km WNW of San Francisco Zoo, CA
  15. 1.7 6 km WNW of San Francisco Zoo, 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.