QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

9km ESE of Redwood Valley, CA

· 6.6 km deep · released about 140 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 34 kmMendocino County 36 kmGlenn County 72 kmColusa County 75 kmSonoma County 81 kmNapa 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 2.5 (md)
Depth
6.6 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Lake County, 34 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1993 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 140 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 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 75,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.7× the energy of this one
  4. This earthquake M 2.5 about 140 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 39.2430, -123.1052. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 34 km (21 mi) WNW of here earthquakes near Lake County
Mendocino County, CA 36 km (22 mi) SE of here earthquakes near Mendocino County
Glenn County, CA 72 km (45 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 75 km (47 mi) W of here earthquakes near Colusa County
Sonoma County, CA 81 km (51 mi) N of here earthquakes near Sonoma County
Napa County, CA 106 km (66 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

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

  1. 1.5 5km E of Clearlake Oaks, CA
  2. 1.5 8km SSW of Kelseyville, CA
  3. 1.7 12km W of Lakeport, CA
  4. 1.5 21km ENE of Navarro Head, CA
  5. 1.9 10km ESE of Redwood Valley, CA
  6. 2.0 6km ENE of Lake Pillsbury, CA
  7. 1.7 11km N of Lake Pillsbury, CA
  8. 2.6 10km ESE of Redwood Valley, CA
  9. 1.8 10km NNW of Redwood Valley, CA
  10. 2.2 11km ESE of Willits, CA
  11. 2.0 9km ESE of Redwood Valley, CA
  12. 1.8 9km ESE of Redwood Valley, CA
  13. 2.0 6km NNE of Lake Pillsbury, CA
  14. 1.7 8km SSW of Kelseyville, CA
  15. 2.0 8km SSW of Kelseyville, 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 9,100 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.