QuakeIndex

Earthquake · reviewed by a seismologist

M 5.0mw

10 km W of Cobb, California

· 1.5 km deep · released about 490 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 33 kmSonoma County 34 kmNapa County 57 kmColusa County 65 kmYolo County 83 kmMendocino County 85 kmMarin County 86 kmGlenn County 95 kmSolano 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 5.0 (mw)
Depth
1.5 km below the surface
Felt
1476 reports · strongest reported intensity VI
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Lake County, 33 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1608 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 1476 people have reported feeling it to USGS.

How big was it?

This earthquake released about 490 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 340× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15× the energy of this one
  3. Magna, Utah 2020 M 5.7 11× the energy of this one
  4. This earthquake M 5.0 about 490 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 1,000× more

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 38.8222, -122.8413. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 33 km (20 mi) SSW of here earthquakes near Lake County
Sonoma County, CA 34 km (21 mi) NNE of here earthquakes near Sonoma County
Napa County, CA 57 km (35 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 83 km (52 mi) WNW of here earthquakes near Yolo County
Mendocino County, CA 85 km (53 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

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

  1. 1.5 6 km WSW of Cobb, California
  2. 1.9 3 km N of Geyserville, California
  3. 1.9 3 km SSW of Cobb, California
  4. 1.5 9 km WNW of Cobb, California
  5. 1.7 6 km S of Cobb, California
  6. 1.8 7 km W of Cobb, CA
  7. 1.6 7 km W of Cobb, California
  8. 1.7 3 km N of Larkfield-Wikiup, California
  9. 1.8 8 km S of Cobb, California
  10. 1.8 5 km SSE of Cobb, California
  11. 2.2 Northern California
  12. 1.5 2 km SSW of Cobb, California
  13. 1.8 7 km WNW of Cobb, California
  14. 1.8 9 km W of Cobb, California
  15. 1.6 4 km S 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.