QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

15km NW of Laytonville, CA

· -0.8 km deep · released about 450 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 40 kmLake County 105 kmGlenn County 106 kmTrinity County 107 kmHumboldt County 107 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 2.8 (md)
Depth
-0.8 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 40 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1742 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 450 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 34,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 24,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.1× the energy of this one
  4. This earthquake M 2.8 about 450 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 39.7698, -123.6207. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 40 km (25 mi) NNW of here earthquakes near Mendocino County
Lake County, CA 105 km (65 mi) NW of here earthquakes near Lake County
Glenn County, CA 106 km (66 mi) W of here earthquakes near Glenn County
Trinity County, CA 107 km (66 mi) SSW of here earthquakes near Trinity County
Humboldt County, CA 107 km (67 mi) SSE of here earthquakes near Humboldt County
Tehama County, CA 125 km (78 mi) WSW of here earthquakes near Tehama County

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

Aftershocks so far

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

  1. 1.5 20km NW of Lake Pillsbury, CA
  2. 1.9 9km NNE of Brooktrails, CA
  3. 1.5 14km NNE of Brooktrails, CA
  4. 1.7 21km SE of Covelo, CA
  5. 2.0 20km NE of Brooktrails, CA
  6. 1.9 21km NNE of Rockport, CA
  7. 2.2 21km NNE of Rockport, CA
  8. 1.7 13km ESE of Redway, CA
  9. 2.5 6km NNE of Fort Bragg, CA
  10. 1.7 11km SE of Laytonville, CA
  11. 1.7 4km NNW of Redway, CA
  12. 1.9 4km NNW of Redway, CA
  13. 2.6 3km NNW of Redway, CA
  14. 2.6 3km NNW of Redway, CA
  15. 1.9 14km N of Rockport, 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 2017-12-14 — it released about 170 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.