QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

8 km WSW of Cobb, California

· 2.8 km deep · released about 9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 32 kmLake County 35 kmNapa County 54 kmColusa County 65 kmYolo County 81 kmMarin County 84 kmMendocino County 88 kmGlenn County 96 kmSolano County 97 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
2.8 km below the surface
Felt
no reports yet
Nearest
Sonoma County, 32 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3259 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 9 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 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 9 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 38.8018, -122.8185. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 32 km (20 mi) NNE of here earthquakes near Sonoma County
Lake County, CA 35 km (22 mi) S of here earthquakes near Lake County
Napa County, CA 54 km (33 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 81 km (50 mi) W of here earthquakes near Yolo County
Marin County, CA 84 km (52 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. 1.7 2km W of Anderson Springs, CA
  2. 1.7 2km N of The Geysers, CA
  3. 1.9 11 km W of Cobb, California
  4. 1.7 9 km W of Cobb, California
  5. 1.9 6 km W of Cobb, California
  6. 1.6 7 km E of Clearlake Oaks, California
  7. 1.5 7 km S of Cobb, California
  8. 1.9 8 km W of Cobb, California
  9. 1.7 5 km SSW of Cobb, California
  10. 1.6 6 km W of Cobb, California
  11. 1.8 7 km W of Cobb, California
  12. 1.9 7 km W of Cobb, California
  13. 1.5 7 km S of Cobb, California
  14. 1.9 8 km W of Cobb, California
  15. 2.1 4 km W of Cobb, California

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 110,000 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.