QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5mw

0 km WSW of Westhaven-Moonstone, California

· 23 km deep · released about 3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 40 kmDel Norte County 79 kmTrinity County 95 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 3.5 (mw)
Depth
23 km below the surface
Felt
367 reports · strongest reported intensity IV
Measured shaking
intensity II (ShakeMap)
Nearest
Humboldt County, 40 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3327 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 367 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 57,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,800× the energy of this one
  4. This earthquake M 3.5 about 3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 6.2× more

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 41.0418, -124.1117. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humboldt County, CA 40 km (25 mi) NNW of here earthquakes near Humboldt County
Del Norte County, CA 79 km (49 mi) S of here earthquakes near Del Norte County
Trinity County, CA 95 km (59 mi) WNW of here earthquakes near Trinity County

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

Aftershocks so far

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

  1. 2.4 5km E of Pine Hills, CA
  2. 2.9 44km WNW of Bayview, CA
  3. 3.4 6km NE of Willow Creek, CA
  4. 2.3 20km NNW of Trinidad, CA
  5. 2.1 22km SSW of Willow Creek, CA
  6. 2.6 7km SE of Pine Hills, CA
  7. 2.2 15km W of Humboldt Hill, CA
  8. 2.5 14km W of Humboldt Hill, CA
  9. 2.2 6km NNE of Hydesville, CA
  10. 2.1 6km NNE of Hydesville, CA
  11. 2.7 6km NNE of Hydesville, CA
  12. 1.9 24km SSE of Blue Lake, CA
  13. 3.2 15km NE of Westhaven-Moonstone, CA
  14. 2.1 6km E of Fortuna, CA
  15. 2.0 14km WNW of Willow Creek, 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 4.8 on 2016-07-21 — it released about 83 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.