QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

4km SW of Talmage, CA

· 0.5 km deep · released about 58 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 40 kmMendocino County 41 kmSonoma County 69 kmColusa County 84 kmGlenn County 88 kmNapa County 102 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
0.5 km below the surface
Felt
9 reports · strongest reported intensity III
Nearest
Lake County, 40 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2889 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 9 people have reported feeling it to USGS.

How big was it?

This earthquake released about 58 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 5.8 260,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 58 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 39.1083, -123.2078. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 40 km (25 mi) W of here earthquakes near Lake County
Mendocino County, CA 41 km (26 mi) SSE of here earthquakes near Mendocino County
Sonoma County, CA 69 km (43 mi) NNW of here earthquakes near Sonoma County
Colusa County, CA 84 km (52 mi) W of here earthquakes near Colusa County
Glenn County, CA 88 km (55 mi) SW of here earthquakes near Glenn County
Napa County, CA 102 km (63 mi) NW of here earthquakes near Napa County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.5 7km NW of The Geysers, CA
  2. 1.9 6km NW of The Geysers, CA
  3. 1.6 13km NW of Sea Ranch, CA
  4. 1.9 6km NW of The Geysers, CA
  5. 1.6 7km ENE of Willits, CA
  6. 1.9 16km NE of Upper Lake, CA
  7. 1.6 6km WNW of The Geysers, CA
  8. 1.6 6km NW of The Geysers, CA
  9. 2.5 5km NW of The Geysers, CA
  10. 1.6 8km WNW of Cobb, CA
  11. 2.4 6km WNW of The Geysers, CA
  12. 1.7 20km WSW of Cloverdale, CA
  13. 1.9 7km NE of Brooktrails, CA
  14. 1.5 6km NNW of The Geysers, CA
  15. 2.2 6km ESE of Willits, 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 5.1 on 2016-08-10 — it released about 22,000 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.