QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

3 km ENE of Lakeport, California

· 20 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 13 kmColusa County 57 kmSonoma County 58 kmMendocino County 65 kmGlenn County 74 kmNapa County 77 kmYolo County 94 kmSutter County 102 kmMarin County 112 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 1.5 (md)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Lake County, 13 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3336 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 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 39.0498, -122.8792. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 13 km (8 mi) WSW of here earthquakes near Lake County
Colusa County, CA 57 km (36 mi) WSW of here earthquakes near Colusa County
Sonoma County, CA 58 km (36 mi) N of here earthquakes near Sonoma County
Mendocino County, CA 65 km (40 mi) SE of here earthquakes near Mendocino County
Glenn County, CA 74 km (46 mi) SW of here earthquakes near Glenn County
Napa County, CA 77 km (48 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

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

  1. 1.9 4 km W of Cobb, California
  2. 1.8 6 km W of Cobb, California
  3. 1.7 Northern California
  4. 1.8 18 km E of Potter Valley, California
  5. 1.7 5 km S of Cobb, California
  6. 1.6 5 km WNW of Cobb, California
  7. 1.6 5 km SSW of Cobb, California
  8. 1.9 4 km SSW of Cobb, California
  9. 1.6 5 km SSW of Cobb, California
  10. 1.7 10 km ENE of Talmage, California
  11. 1.9 8 km W of Cobb, California
  12. 1.8 5km NW of The Geysers, CA
  13. 2.1 6 km WSW of Cobb, California
  14. 1.6 7km NW of The Geysers, CA
  15. 1.6 1km NNW 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 220,000 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.