QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

18km ENE of Nice, CA

· 4.5 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 13 kmColusa County 38 kmGlenn County 50 kmMendocino County 70 kmSonoma County 79 kmNapa County 84 kmSutter County 86 kmYolo County 89 kmButte County 105 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
4.5 km below the surface
Felt
no reports yet
Nearest
Lake County, 13 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1774 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 12 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 870,000× the energy of this one
  3. Around the size people start to feel M 3.0 78× the energy of this one
  4. This earthquake M 1.7 about 12 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 39.2102, -122.6788. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 13 km (8 mi) NNE of here earthquakes near Lake County
Colusa County, CA 38 km (24 mi) W of here earthquakes near Colusa County
Glenn County, CA 50 km (31 mi) SSW of here earthquakes near Glenn County
Mendocino County, CA 70 km (44 mi) ESE of here earthquakes near Mendocino County
Sonoma County, CA 79 km (49 mi) NNE of here earthquakes near Sonoma County
Napa County, CA 84 km (52 mi) NNW of here earthquakes near Napa 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. 2.0 0km NE of The Geysers, CA
  2. 2.0 5km W of Cobb, CA
  3. 1.7 3km W of Anderson Springs, CA
  4. 1.6 3km E of The Geysers, CA
  5. 2.6 8km WNW of Cobb, CA
  6. 1.8 7km WNW of Cobb, CA
  7. 1.5 5km NW of The Geysers, CA
  8. 1.5 5km NNE of Clearlake, CA
  9. 1.7 1km NE of The Geysers, CA
  10. 1.5 10km NW of The Geysers, CA
  11. 1.7 4km W of Cobb, CA
  12. 1.6 3km NW of The Geysers, CA
  13. 1.6 7km W of Cobb, CA
  14. 1.9 7km W of Cobb, CA
  15. 1.6 2km NW of The Geysers, 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 110,000 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.