QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

6 km W of Cobb, California

· 3.3 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 32 kmSonoma County 35 kmNapa County 54 kmColusa County 63 kmYolo County 80 kmMarin County 86 kmMendocino County 88 kmGlenn County 94 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 1.9 (md)
Depth
3.3 km below the surface
Felt
4 reports · strongest reported intensity I
Nearest
Lake County, 32 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1512 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 4 people have reported feeling it to USGS.

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 38.8207, -122.8023. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 32 km (20 mi) S of here earthquakes near Lake County
Sonoma County, CA 35 km (21 mi) NNE of here earthquakes near Sonoma County
Napa County, CA 54 km (34 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 80 km (49 mi) WNW of here earthquakes near Yolo County
Marin County, CA 86 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

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

  1. 1.6 9 km W of Cobb, California
  2. 2.0 7 km W of Cobb, California
  3. 1.6 8 km W of Cobb, California
  4. 2.8 9 km WNW of Cobb, California
  5. 1.6 0 km SE of Angwin, California
  6. 2.0 5 km WNW of Cobb, California
  7. 1.8 5 km N of Healdsburg, California
  8. 1.7 7 km W of Cobb, California
  9. 1.9 3 km W of Clear Lake Riviera, California
  10. 1.8 10 km W of Cobb, California
  11. 2.1 8 km WSW of Cobb, California
  12. 1.5 5 km SW of Cobb, California
  13. 1.8 3 km WSW of Hopland, California
  14. 1.5 7 km WNW of Cobb, California
  15. 1.7 7 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 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.