QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

7km WNW of The Geysers, CA

· 2.8 km deep · released about 22 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 33 kmLake County 34 kmNapa County 55 kmColusa County 65 kmYolo County 82 kmMarin County 85 kmMendocino County 87 kmGlenn County 95 kmSolano County 98 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
2.8 km below the surface
Felt
no reports yet
Nearest
Sonoma County, 33 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3131 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 22 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 5.8 680,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 480,000× the energy of this one
  3. Around the size people start to feel M 3.0 43× the energy of this one
  4. This earthquake M 1.9 about 22 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 38.8115, -122.8283. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 33 km (20 mi) NNE of here earthquakes near Sonoma County
Lake County, CA 34 km (21 mi) SSW of here earthquakes near Lake County
Napa County, CA 55 km (34 mi) NW of here earthquakes near Napa County
Colusa County, CA 65 km (41 mi) SW of here earthquakes near Colusa County
Yolo County, CA 82 km (51 mi) W of here earthquakes near Yolo County
Marin County, CA 85 km (53 mi) N of here earthquakes near Marin County

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

Aftershocks so far

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

  1. 2.1 2km SE of The Geysers, CA
  2. 1.7 10km NW of The Geysers, CA
  3. 1.7 10km WNW of The Geysers, CA
  4. 1.9 4km WNW of Cobb, CA
  5. 2.8 2km NNE of The Geysers, CA
  6. 1.9 6km NW of The Geysers, CA
  7. 1.9 7km NW of The Geysers, CA
  8. 1.8 5km NW of The Geysers, CA
  9. 1.6 10km NNE of Cloverdale, CA
  10. 1.6 10km NNE of Cloverdale, CA
  11. 1.7 6km WNW of The Geysers, CA
  12. 1.5 2km ESE of Clearlake, CA
  13. 1.6 8km W of Upper Lake, CA
  14. 1.7 6km NW of The Geysers, CA
  15. 1.7 5km WNW of Cobb, 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 45,000 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.