QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

16 km E of Hidden Valley Lake, CA

· 4.0 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 38 kmColusa County 39 kmLake County 43 kmYolo County 45 kmSonoma County 59 kmSutter County 62 kmSolano County 75 kmGlenn County 84 kmMarin County 94 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
4.0 km below the surface
Felt
no reports yet
Nearest
Napa County, 38 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 479 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 19 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 5.8 790,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 560,000× the energy of this one
  3. Around the size people start to feel M 3.0 50× the energy of this one
  4. This earthquake M 1.9 about 19 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 38.8450, -122.3783. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 38 km (24 mi) N of here earthquakes near Napa County
Colusa County, CA 39 km (24 mi) SSW of here earthquakes near Colusa County
Lake County, CA 43 km (27 mi) SE of here earthquakes near Lake County
Yolo County, CA 45 km (28 mi) WNW of here earthquakes near Yolo County
Sonoma County, CA 59 km (37 mi) NE of here earthquakes near Sonoma County
Sutter County, CA 62 km (39 mi) WSW of here earthquakes near Sutter County

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

Aftershocks so far

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

  1. 1.9 4 km NNW of The Geysers, CA
  2. 2.1 4 km NNW of The Geysers, CA
  3. 1.6 3 km WSW of Cobb, CA
  4. 3.4 3 km of The Geysers, CA
  5. 1.5 3 km NW of The Geysers, CA
  6. 1.5 20 km ENE of Clearlake, CA
  7. 1.7 7 km NE of Larkfield-Wikiup, CA
  8. 1.9 3 km W of Cobb, CA
  9. 1.7 8 km NNW of The Geysers, CA
  10. 2.0 3 km NW of The Geysers, CA
  11. 1.8 3 km NW of The Geysers, CA
  12. 1.6 6 km NNW of The Geysers, CA
  13. 1.8 5 km NNW of The Geysers, CA
  14. 1.7 20 km E of Clearlake Oaks, CA
  15. 2.1 3 km NW 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 51,000 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.