QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

39km SSW of Point Reyes, CA

· 7.3 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Francisco County 11 kmMarin County 54 kmSan Mateo County 72 kmSonoma County 97 kmAlameda County 107 kmContra Costa County 107 kmNapa 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 1.9 (md)
Depth
7.3 km below the surface
Felt
no reports yet
Nearest
San Francisco County, 11 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2410 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 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 810,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 580,000× the energy of this one
  3. Around the size people start to feel M 3.0 51× the energy of this one
  4. This earthquake M 1.9 about 19 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 37.6672, -123.1263. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Francisco County, CA 11 km (7 mi) SW of here earthquakes near San Francisco County
Marin County, CA 54 km (34 mi) SW of here earthquakes near Marin County
San Mateo County, CA 72 km (45 mi) WNW of here earthquakes near San Mateo County
Sonoma County, CA 97 km (60 mi) S of here earthquakes near Sonoma County
Alameda County, CA 107 km (66 mi) W of here earthquakes near Alameda County
Contra Costa County, CA 107 km (66 mi) WSW 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

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

  1. 2.4 11 km SSW of Bolinas, CA
  2. 1.8 7 km S of Muir Beach, CA
  3. 1.9 8 km S of Muir Beach, CA
  4. 1.6 4 km SW of Muir Beach, CA
  5. 1.6 9 km W of Lagunitas-Forest Knolls, CA
  6. 2.0 32 km SSW of Point Reyes, CA
  7. 2.1 8 km WNW of San Francisco Zoo, CA
  8. 1.7 7 km SSW of Muir Beach, CA
  9. 2.2 7 km SSW of Muir Beach, CA
  10. 1.6 7km S of Muir Beach, CA
  11. 1.7 10km WNW of San Francisco Zoo, CA
  12. 2.6 8km WSW of Muir Beach, CA
  13. 2.6 7km SSW of Muir Beach, CA
  14. 1.5 9km SW of Point Reyes, CA
  15. 1.6 19km SW of Point Reyes, 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.