QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

18 km NE of Upper Lake, CA

· 5.5 km deep · released about 150 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 22 kmGlenn County 47 kmColusa County 50 kmMendocino County 58 kmSonoma County 87 kmNapa County 97 kmSutter County 98 kmYolo County 103 kmTehama County 104 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 2.5 (md)
Depth
5.5 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Lake County, 22 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 17 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 150 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 72,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.5× the energy of this one
  4. This earthquake M 2.5 about 150 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 39.2998, -122.7918. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 22 km (13 mi) N of here earthquakes near Lake County
Glenn County, CA 47 km (30 mi) SW of here earthquakes near Glenn County
Colusa County, CA 50 km (31 mi) WNW of here earthquakes near Colusa County
Mendocino County, CA 58 km (36 mi) ESE of here earthquakes near Mendocino County
Sonoma County, CA 87 km (54 mi) N of here earthquakes near Sonoma County
Napa County, CA 97 km (60 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

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

  1. 2.0 7 km N of Redwood Valley, CA
  2. 1.9 9 km ENE of Brooktrails, CA
  3. 2.4 6 km E of Willits, CA
  4. 1.7 7 km E of Willits, CA
  5. 1.7 12 km WNW of Cobb, CA
  6. 1.9 7 km E of Willits, CA
  7. 1.5 8 km E of Willits, CA
  8. 3.0 10 km WNW of Cobb, CA
  9. 2.8 10 km WNW of Cobb, CA
  10. 1.7 11 km WNW of Cobb, CA
  11. 2.6 12 km WNW of Cobb, CA
  12. 2.5 11 km WNW of Cobb, CA
  13. 1.5 11 km WNW of Cobb, CA
  14. 1.9 11 km WNW of Cobb, CA
  15. 1.6 6 km NW of Lake Pillsbury, 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 5.6 on 2026-06-24 — it released about 50,000 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.