QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

16km ESE of Navarro Head, CA

· 0.1 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 35 kmLake County 73 kmSonoma County 89 kmGlenn County 115 kmColusa 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
0.1 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 35 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2554 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× 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 39.1378, -123.5935. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 35 km (22 mi) SSW of here earthquakes near Mendocino County
Lake County, CA 73 km (46 mi) W of here earthquakes near Lake County
Sonoma County, CA 89 km (56 mi) NW of here earthquakes near Sonoma County
Glenn County, CA 115 km (71 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 117 km (73 mi) W of here earthquakes near Colusa County
Napa County, CA 130 km (81 mi) WNW of here earthquakes near Napa County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.3 1km WSW of Redwood Valley, CA
  2. 2.6 2km SW of Redwood Valley, CA
  3. 2.2 16km ESE of Boonville, CA
  4. 2.1 11km NNE of Talmage, CA
  5. 2.1 4km NW of Redwood Valley, CA
  6. 1.8 16km ESE of Navarro Head, CA
  7. 1.9 19km NW of Cloverdale, CA
  8. 2.8 10km NNE of Talmage, CA
  9. 2.6 12km N of Point Arena, CA
  10. 1.6 6km E of Willits, CA
  11. 2.2 12km N of Point Arena, CA
  12. 2.3 13km N of Point Arena, CA
  13. 1.8 8km ESE of Redwood Valley, CA
  14. 2.0 1km W of Redwood Valley, CA
  15. 3.5 2km W of Redwood Valley, 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 4.3 on 2019-04-29 — it released about 6,900 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.