QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

20 km NNE of Upper Lake, California

· 14 km deep · released about 1,200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 25 kmGlenn County 45 kmColusa County 51 kmMendocino County 57 kmSonoma County 90 kmSutter County 100 kmNapa County 100 kmTehama County 101 kmYolo County 106 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 3.1 (ml)
Depth
14 km below the surface
Felt
8 reports · strongest reported intensity III
Nearest
Lake County, 25 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3495 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 8 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 290,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 13,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 9,100× the energy of this one
  4. This earthquake M 3.1 about 1,200 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.2× more

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 39.3303, -122.7967. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 25 km (16 mi) N of here earthquakes near Lake County
Glenn County, CA 45 km (28 mi) SW of here earthquakes near Glenn County
Colusa County, CA 51 km (32 mi) WNW of here earthquakes near Colusa County
Mendocino County, CA 57 km (35 mi) ESE of here earthquakes near Mendocino County
Sonoma County, CA 90 km (56 mi) N of here earthquakes near Sonoma County
Sutter County, CA 100 km (62 mi) WNW of here earthquakes near Sutter 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. 2.2 4 km E of Willits, California
  2. 2.4 28 km NNE of Potter Valley, California
  3. 1.7 10km SE of Lake Pillsbury, CA
  4. 1.6 10km SSE of Lake Pillsbury, CA
  5. 2.0 7 km E of Clearlake Oaks, California
  6. 1.6 5 km E of Hopland, California
  7. 1.6 19 km NNE of Upper Lake, California
  8. 2.1 18 km ENE of Potter Valley, California
  9. 1.8 6 km E of Redwood Valley, California
  10. 1.8 18 km E of Potter Valley, California
  11. 1.6 20 km ENE of Potter Valley, California
  12. 1.8 19 km NNE of Upper Lake, California
  13. 2.0 18 km NE of Upper Lake, California
  14. 2.1 1 km SW of Calpella, California
  15. 1.8 2 km SW of Calpella, 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 5.1 on 2016-08-10 — it released about 1,100 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.