QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

10km WNW of The Geysers, CA

· 3.0 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 33 kmSonoma County 33 kmNapa County 58 kmColusa County 66 kmYolo County 84 kmMendocino County 85 kmMarin County 86 kmGlenn County 95 kmSolano County 100 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 1.8 (md)
Depth
3.0 km below the surface
Felt
no reports yet
Nearest
Lake County, 33 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2684 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 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× the energy of this one
  4. This earthquake M 1.8 about 17 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 38.8202, -122.8532. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 33 km (21 mi) SSW of here earthquakes near Lake County
Sonoma County, CA 33 km (21 mi) N of here earthquakes near Sonoma County
Napa County, CA 58 km (36 mi) NW of here earthquakes near Napa County
Colusa County, CA 66 km (41 mi) SW of here earthquakes near Colusa County
Yolo County, CA 84 km (52 mi) W of here earthquakes near Yolo County
Mendocino County, CA 85 km (53 mi) SE of here earthquakes near Mendocino 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. 2.2 4km W of Cobb, CA
  2. 1.6 6km NW of The Geysers, CA
  3. 2.0 6km WNW of Cobb, CA
  4. 1.9 5km ENE of Angwin, CA
  5. 2.1 4km SSE of The Geysers, CA
  6. 1.8 3km S of Angwin, CA
  7. 1.6 7km NW of The Geysers, CA
  8. 1.7 1km ESE of The Geysers, CA
  9. 2.2 4km NW of The Geysers, CA
  10. 2.0 4km NNW of The Geysers, CA
  11. 1.6 3km NNW of The Geysers, CA
  12. 1.6 5km NW of The Geysers, CA
  13. 1.9 4km WNW of The Geysers, CA
  14. 2.1 5km NW of The Geysers, CA
  15. 1.7 2km WNW 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 5.0 on 2016-12-14 — it released about 57,000 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.