QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

30km W of Bayview, CA

· 18 km deep · released about 200 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 53 kmDel Norte County 114 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 2.5 (md)
Depth
18 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Humboldt County, 53 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3049 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 200 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 75,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 53,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.7× the energy of this one
  4. This earthquake M 2.5 about 200 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 40.8127, -124.5392. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humboldt County, CA 53 km (33 mi) WNW of here earthquakes near Humboldt County
Del Norte County, CA 114 km (71 mi) SSW of here earthquakes near Del Norte County

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

Aftershocks so far

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

  1. 2.1 6km E of Fortuna, CA
  2. 2.6 39km WNW of Petrolia, CA
  3. 2.5 65km WNW of Bayview, CA
  4. 2.0 6km WSW of Rio Dell, CA
  5. 1.9 2km SW of Arcata, CA
  6. 1.9 32km WNW of Petrolia, CA
  7. 1.9 8km S of Ferndale, CA
  8. 2.6 59km W of Ferndale, CA
  9. 1.7 11km WSW of Ferndale, CA
  10. 2.3 39km WNW of Petrolia, CA
  11. 2.8 28km NW of Ferndale, CA
  12. 1.6 16km NNW of Petrolia, CA
  13. 2.0 16km WNW of Petrolia, CA
  14. 1.8 12km SSW of Ferndale, CA
  15. 1.7 2km SSE of Hydesville, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.