QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

10km WNW of Cobb, CA

· 2.2 km deep · released about 6.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 31 kmSonoma County 36 kmNapa County 57 kmColusa County 63 kmYolo County 82 kmMendocino County 84 kmMarin County 88 kmGlenn County 92 kmSutter 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 1.6 (md)
Depth
2.2 km below the surface
Felt
no reports yet
Nearest
Lake County, 31 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2579 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 6.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.6 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 38.8408, -122.8297. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 31 km (19 mi) SSW of here earthquakes near Lake County
Sonoma County, CA 36 km (22 mi) NNE of here earthquakes near Sonoma County
Napa County, CA 57 km (36 mi) NW of here earthquakes near Napa County
Colusa County, CA 63 km (39 mi) SW of here earthquakes near Colusa County
Yolo County, CA 82 km (51 mi) WNW of here earthquakes near Yolo County
Mendocino County, CA 84 km (52 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

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

  1. 2.6 7km W of Cobb, CA
  2. 2.4 9km NW of The Geysers, CA
  3. 2.8 9km WNW of Cobb, CA
  4. 2.0 7km NW of The Geysers, CA
  5. 1.5 6km WNW of The Geysers, CA
  6. 1.6 3km NW of The Geysers, CA
  7. 1.6 7km NW of The Geysers, CA
  8. 1.9 10km NW of Cobb, CA
  9. 1.7 7km NW of The Geysers, CA
  10. 2.0 6km NW of The Geysers, CA
  11. 1.5 7km NW of The Geysers, CA
  12. 1.7 4km W of Cobb, CA
  13. 1.5 4km NW of The Geysers, CA
  14. 1.6 7km W of Cobb, CA
  15. 1.6 12km ESE of Hidden Valley Lake, 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 150,000 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.