QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

12 km WSW of Hopland, California

· 5.2 km deep · released about 52 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 48 kmSonoma County 51 kmMendocino County 60 kmNapa County 91 kmColusa County 91 kmGlenn County 105 kmMarin County 105 kmYolo County 119 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 2.2 (md)
Depth
5.2 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Lake County, 48 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3308 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 52 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 290,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 200,000× the energy of this one
  3. Around the size people start to feel M 3.0 18× the energy of this one
  4. This earthquake M 2.2 about 52 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 38.9145, -123.2380. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 48 km (30 mi) WSW of here earthquakes near Lake County
Sonoma County, CA 51 km (32 mi) NNW of here earthquakes near Sonoma County
Mendocino County, CA 60 km (37 mi) SSE of here earthquakes near Mendocino County
Napa County, CA 91 km (57 mi) WNW of here earthquakes near Napa County
Colusa County, CA 91 km (57 mi) WSW of here earthquakes near Colusa County
Glenn County, CA 105 km (65 mi) SW of here earthquakes near Glenn 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. 1.6 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. 2.0 5 km WNW of Cobb, California
  6. 1.8 5 km N of Healdsburg, California
  7. 1.7 7 km W of Cobb, California
  8. 1.9 3 km W of Clear Lake Riviera, California
  9. 1.8 10 km W of Cobb, California
  10. 2.1 8 km WSW of Cobb, California
  11. 1.5 5 km SW of Cobb, California
  12. 1.8 3 km WSW of Hopland, California
  13. 1.5 7 km WNW of Cobb, California
  14. 1.7 7 km W of Cobb, California
  15. 1.9 5 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.0 on 2016-12-14 — it released about 19,000 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.