QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

12km W of Lakeport, CA

· 3.5 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 28 kmMendocino County 56 kmSonoma County 57 kmColusa County 73 kmGlenn County 85 kmNapa County 86 kmYolo County 107 kmMarin County 112 kmSutter County 117 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
3.5 km below the surface
Felt
no reports yet
Nearest
Lake County, 28 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1976 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 39.0255, -123.0562. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 28 km (18 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) NNW of here earthquakes near Sonoma County
Colusa County, CA 73 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 86 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. 1.5 8km NW of The Geysers, CA
  2. 1.8 2km ESE of The Geysers, CA
  3. 3.0 2km ESE of The Geysers, CA
  4. 1.9 13km SE of Lake Pillsbury, CA
  5. 1.8 7km NW of The Geysers, CA
  6. 2.0 7km NW of The Geysers, CA
  7. 1.9 6km NW of The Geysers, CA
  8. 1.7 9km NNW of Redwood Valley, CA
  9. 1.7 2km NE of The Geysers, CA
  10. 1.9 1km NNW of The Geysers, CA
  11. 1.7 1km E of The Geysers, CA
  12. 1.7 5km WSW of Redwood Valley, CA
  13. 2.1 7km NW of The Geysers, CA
  14. 1.9 5km NE of Talmage, CA
  15. 2.1 9km ESE of Willits, 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 92,000 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.