QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

5 km SW of Cobb, California

· 1.2 km deep · released about 9.3 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 32 kmLake County 36 kmNapa County 49 kmColusa County 63 kmYolo County 75 kmMarin County 82 kmSolano County 92 kmMendocino County 93 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 1.7 (md)
Depth
1.2 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 3516 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 9.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 100× the energy of this one
  4. This earthquake M 1.7 about 9.3 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 38.7863, -122.7623. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 32 km (20 mi) NNE of here earthquakes near Sonoma County
Lake County, CA 36 km (22 mi) S of here earthquakes near Lake County
Napa County, CA 49 km (30 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 75 km (47 mi) W of here earthquakes near Yolo County
Marin County, CA 82 km (51 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. 1.7 5 km SW of Cobb, California
  2. 1.9 6 km S of Cobb, CA
  3. 1.6 7 km WNW of Cobb, California
  4. 1.5 6 km W of Cobb, California
  5. 1.9 4 km WNW of Cobb, California
  6. 1.5 4 km SSW of Cobb, California
  7. 1.5 8 km W of Cobb, California
  8. 2.0 7 km W of Middletown, California
  9. 2.1 9 km SSW of Calistoga, California
  10. 1.6 8 km WSW of Cobb, California
  11. 1.7 8 km WSW of Cobb, California
  12. 1.8 8 km WSW of Cobb, California
  13. 1.8 6 km ENE of Santa Rosa, California
  14. 1.6 4 km WSW of Cobb, California
  15. 1.8 3 km WSW 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.