QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

2 km WNW of Cotati, CA

· 4.6 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 27 kmMarin County 32 kmNapa County 40 kmSolano County 69 kmSan Francisco County 73 kmYolo County 82 kmContra Costa County 82 kmLake County 86 kmColusa County 103 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
4.6 km below the surface
Felt
no reports yet
Nearest
Sonoma County, 27 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 268 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 5.9 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 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 38.3348, -122.7312. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 27 km (17 mi) SE of here earthquakes near Sonoma County
Marin County, CA 32 km (20 mi) N of here earthquakes near Marin County
Napa County, CA 40 km (25 mi) WSW of here earthquakes near Napa County
Solano County, CA 69 km (43 mi) W of here earthquakes near Solano County
San Francisco County, CA 73 km (45 mi) NNE of here earthquakes near San Francisco County
Yolo County, CA 82 km (51 mi) WSW of here earthquakes near Yolo County

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

Aftershocks so far

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

  1. 1.7 1 km W of The Geysers, CA
  2. 1.7 1 km ENE of The Geysers, CA
  3. 1.5 7 km SSW of Calistoga, CA
  4. 2.1 13 km SE of Middletown, CA
  5. 1.8 2 km E of The Geysers, CA
  6. 2.0 3 km E of The Geysers, CA
  7. 3.0 0 km WNW of The Geysers, CA
  8. 2.3 7 km SSW of Yountville, CA
  9. 1.6 4 km NE of Guerneville, CA
  10. 1.7 7 km W of Kenwood, CA
  11. 2.5 10 km ESE of Black Point-Green Point, CA
  12. 1.7 2 km WNW of Anderson Springs, CA
  13. 2.0 2 km W of Anderson Springs, CA
  14. 1.6 3 km S of Anderson Springs, CA
  15. 2.5 4 km S of Anderson Springs, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2022-09-14 — it released about 19,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.