QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

20 km W of Stonyford, California

· 8.0 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 33 kmGlenn County 39 kmColusa County 53 kmMendocino County 57 kmTehama County 93 kmSonoma County 99 kmSutter County 101 kmButte County 105 kmNapa County 107 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
8.0 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Lake County, 33 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1512 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 11 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 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 930,000× the energy of this one
  3. Around the size people start to feel M 3.0 83× the energy of this one
  4. This earthquake M 1.7 about 11 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 39.4057, -122.7775. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 33 km (21 mi) N of here earthquakes near Lake County
Glenn County, CA 39 km (24 mi) SW of here earthquakes near Glenn County
Colusa County, CA 53 km (33 mi) WNW of here earthquakes near Colusa County
Mendocino County, CA 57 km (36 mi) E of here earthquakes near Mendocino County
Tehama County, CA 93 km (58 mi) SSW of here earthquakes near Tehama County
Sonoma County, CA 99 km (61 mi) N of here earthquakes near Sonoma County

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

Aftershocks so far

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

  1. 1.6 19km NE of Upper Lake, CA
  2. 2.0 19km WSW of Williams, CA
  3. 1.6 8km W of Upper Lake, CA
  4. 1.8 9km ESE of Redwood Valley, CA
  5. 2.5 13km SSE of Lake Pillsbury, CA
  6. 1.7 9km NNE of Clearlake, CA
  7. 1.9 19km NE of Upper Lake, CA
  8. 1.7 13km S of Lake Pillsbury, CA
  9. 1.6 19km ESE of Lake Pillsbury, CA
  10. 1.6 7km E of Clearlake Oaks, CA
  11. 1.9 17km SE of Lake Pillsbury, CA
  12. 2.0 8km NNE of Clearlake, CA
  13. 2.2 16km WNW of Lake Pillsbury, CA
  14. 2.2 8km W of Redwood Valley, CA
  15. 2.2 8km W of Redwood Valley, 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.