QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

9km NNE of Larkfield-Wikiup, CA

· 7.6 km deep · released about 18 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 19 kmNapa County 36 kmLake County 58 kmMarin County 60 kmYolo County 72 kmSolano County 77 kmColusa County 78 kmSan Francisco County 100 kmContra Costa County 101 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
7.6 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Sonoma County, 19 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2210 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 18 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 5.8 840,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 600,000× the energy of this one
  3. Around the size people start to feel M 3.0 53× the energy of this one
  4. This earthquake M 1.9 about 18 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 38.5908, -122.7243. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 19 km (12 mi) ENE of here earthquakes near Sonoma County
Napa County, CA 36 km (22 mi) WNW of here earthquakes near Napa County
Lake County, CA 58 km (36 mi) S of here earthquakes near Lake County
Marin County, CA 60 km (37 mi) N of here earthquakes near Marin County
Yolo County, CA 72 km (45 mi) W of here earthquakes near Yolo County
Solano County, CA 77 km (48 mi) WNW of here earthquakes near Solano County

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

Aftershocks so far

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

  1. 1.5 7km NW of The Geysers, CA
  2. 2.1 6km WSW of Glen Ellen, CA
  3. 1.9 6km WNW of The Geysers, CA
  4. 2.0 6km NW of The Geysers, CA
  5. 2.1 3km SE of The Geysers, CA
  6. 1.5 2km NNE of The Geysers, CA
  7. 2.6 4km NW of Cobb, CA
  8. 2.1 2km NNW of The Geysers, CA
  9. 1.5 7km WNW of The Geysers, CA
  10. 1.7 4km SE of The Geysers, CA
  11. 1.6 14km ESE of Hidden Valley Lake, CA
  12. 1.8 4km SW of Anderson Springs, CA
  13. 1.9 13km NW of The Geysers, CA
  14. 1.8 2km SSW of Cobb, CA
  15. 2.6 8km NNW of Healdsburg, 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 55,000 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.