QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

3km ESE of Larkfield-Wikiup, CA

· 6.6 km deep · released about 140 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 18 kmNapa County 35 kmMarin County 50 kmLake County 68 kmSolano County 73 kmYolo County 74 kmColusa County 86 kmSan Francisco County 90 kmContra Costa County 93 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 2.5 (md)
Depth
6.6 km below the surface
Felt
122 reports · strongest reported intensity III
Nearest
Sonoma County, 18 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1786 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 122 people have reported feeling it to USGS.

How big was it?

This earthquake released about 140 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 75,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.7× the energy of this one
  4. This earthquake M 2.5 about 140 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 38.5003, -122.7237. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 18 km (11 mi) E of here earthquakes near Sonoma County
Napa County, CA 35 km (22 mi) W of here earthquakes near Napa County
Marin County, CA 50 km (31 mi) N of here earthquakes near Marin County
Lake County, CA 68 km (42 mi) S of here earthquakes near Lake County
Solano County, CA 73 km (45 mi) WNW of here earthquakes near Solano County
Yolo County, CA 74 km (46 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. 1.6 3km SE of The Geysers, CA
  2. 1.6 3km SW of Anderson Springs, CA
  3. 1.7 3km NNW of The Geysers, CA
  4. 1.7 6km NW of The Geysers, CA
  5. 1.7 6km NW of The Geysers, CA
  6. 1.7 3km SW of Anderson Springs, CA
  7. 2.6 3km NW of The Geysers, CA
  8. 1.6 10km NE of Healdsburg, CA
  9. 1.8 3km SE of Larkfield-Wikiup, CA
  10. 1.5 0km WNW of The Geysers, CA
  11. 2.0 9km WNW of The Geysers, CA
  12. 1.5 5km NW of The Geysers, CA
  13. 1.6 2km NW of Anderson Springs, CA
  14. 2.4 5km WNW of The Geysers, CA
  15. 1.8 3km ENE of The Geysers, 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 5.0 on 2016-12-14 — it released about 6,900 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.