QuakeIndex

Earthquake · automatic estimate, may change

M 2.5md

6 km NW of Cobb, CA

· 0.9 km deep · released about 180 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 29 kmSonoma County 38 kmNapa County 55 kmColusa County 60 kmYolo County 78 kmMendocino County 87 kmMarin County 88 kmGlenn County 90 kmSutter County 96 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 2.5 (md)
Depth
0.9 km below the surface
Felt
36 reports · strongest reported intensity III
Nearest
Lake County, 29 km N
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 653 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 36 people have reported feeling it to USGS.

How big was it?

This earthquake released about 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 83,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 59,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.2× the energy of this one
  4. This earthquake M 2.5 about 180 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 38.8452, -122.7807. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 29 km (18 mi) S of here earthquakes near Lake County
Sonoma County, CA 38 km (23 mi) NNE of here earthquakes near Sonoma County
Napa County, CA 55 km (34 mi) NW of here earthquakes near Napa County
Colusa County, CA 60 km (37 mi) SW of here earthquakes near Colusa County
Yolo County, CA 78 km (49 mi) WNW of here earthquakes near Yolo County
Mendocino County, CA 87 km (54 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

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

  1. 2.0 10 km NE of Cloverdale, CA
  2. 2.4 6 km WNW of Cobb, CA
  3. 1.6 9 km NW of The Geysers, CA
  4. 2.1 5 km NNW of The Geysers, CA
  5. 2.3 7 km WNW of Cobb, CA
  6. 1.8 11 km SSE of Talmage, CA
  7. 1.7 9 km NW of The Geysers, CA
  8. 2.4 2 km NW of The Geysers, CA
  9. 2.2 8 km NNW of The Geysers, CA
  10. 1.7 6 km NW of The Geysers, CA
  11. 1.7 6 km WNW of Cobb, CA
  12. 1.5 2 km ESE of The Geysers, CA
  13. 1.8 12 km ESE of Hidden Valley Lake, CA
  14. 2.6 3 km ENE of Saint Helena, CA
  15. 1.7 12 km WSW of Lakeport, 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 5,400 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.