QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

19km WNW of Humboldt Hill, CA

· 23 km deep · released about 890 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 41 kmTrinity County 110 kmDel Norte 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 3.0 (ml)
Depth
23 km below the surface
Felt
34 reports · strongest reported intensity III
Nearest
Humboldt County, 41 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2108 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 34 people have reported feeling it to USGS.

How big was it?

This earthquake released about 890 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 380,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 17,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 12,000× the energy of this one
  4. This earthquake M 3.0 about 890 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 40.7600, -124.4102. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humboldt County, CA 41 km (26 mi) W of here earthquakes near Humboldt County
Trinity County, CA 110 km (68 mi) W of here earthquakes near Trinity County
Del Norte County, CA 116 km (72 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

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

  1. 2.2 4km NW of Humboldt Hill, CA
  2. 2.3 1km ENE of Humboldt Hill, CA
  3. 2.5 6km W of Petrolia, CA
  4. 1.8 21km NW of Petrolia, CA
  5. 2.7 35km WNW of Petrolia, CA
  6. 3.0 30km WNW of Ferndale, CA
  7. 1.6 9km WSW of Rio Dell, CA
  8. 3.0 58km W of Ferndale, CA
  9. 1.8 7km N of Petrolia, CA
  10. 2.3 25km WNW of Ferndale, CA
  11. 2.5 14km WNW of Petrolia, CA
  12. 2.5 18km WNW of Petrolia, CA
  13. 2.4 16km SW of Ferndale, CA
  14. 2.9 7km WNW of Petrolia, CA
  15. 2.8 13km W of Petrolia, 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 5.2 on 2020-03-18 — it released about 2,200 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.