QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

11km W of Lakeport, CA

· 7.1 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 27 kmMendocino County 56 kmSonoma County 57 kmColusa County 72 kmGlenn County 85 kmNapa County 85 kmYolo County 106 kmMarin County 112 kmSutter County 116 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 1.8 (md)
Depth
7.1 km below the surface
Felt
no reports yet
Nearest
Lake County, 27 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1965 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 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 39.0288, -123.0462. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 27 km (17 mi) WSW of here earthquakes near Lake County
Mendocino County, CA 56 km (35 mi) SE of here earthquakes near Mendocino County
Sonoma County, CA 57 km (35 mi) N of here earthquakes near Sonoma County
Colusa County, CA 72 km (45 mi) WSW of here earthquakes near Colusa County
Glenn County, CA 85 km (53 mi) SW of here earthquakes near Glenn County
Napa County, CA 85 km (53 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

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

  1. 1.6 6km NNW of The Geysers, CA
  2. 1.8 7km W of Cobb, CA
  3. 1.6 6km NNW of The Geysers, CA
  4. 2.8 4km NW of Cobb, CA
  5. 1.7 10km WNW of The Geysers, CA
  6. 1.6 9km WNW of The Geysers, CA
  7. 2.9 4km SSE of Redwood Valley, CA
  8. 2.3 4km NNW of The Geysers, CA
  9. 2.0 12km WNW of Redwood Valley, CA
  10. 1.9 7km NW of The Geysers, CA
  11. 1.8 10km NNW of Redwood Valley, CA
  12. 2.0 2km NW of The Geysers, CA
  13. 1.6 11km NNE of Boonville, CA
  14. 1.5 18km NNW of Cloverdale, CA
  15. 2.2 4km NW 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 100,000 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.