QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6mw

14km SE of Bayside, CA

· 23 km deep · released about 3.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 6 kmTrinity County 70 kmDel Norte County 110 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 3.6 (mw)
Depth
23 km below the surface
Felt
342 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Humboldt County, 6 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1355 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 342 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 50,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,200× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,600× the energy of this one
  4. This earthquake M 3.6 about 3.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.2× 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 40.7575, -123.9355. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humboldt County, CA 6 km (4 mi) N of here earthquakes near Humboldt County
Trinity County, CA 70 km (44 mi) W of here earthquakes near Trinity County
Del Norte County, CA 110 km (69 mi) S of here earthquakes near Del Norte County
Siskiyou County, CA 149 km (93 mi) SW of here earthquakes near Siskiyou County

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

Aftershocks so far

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

  1. 2.1 36km W of Hayfork, CA
  2. 2.5 24km SE of Blue Lake, CA
  3. 1.8 11km S of Rio Dell, CA
  4. 2.2 8km N of Petrolia, CA
  5. 2.1 17km W of Humboldt Hill, CA
  6. 2.1 28km WNW of Hayfork, CA
  7. 1.7 13km SSW of Ferndale, CA
  8. 1.8 11km SSW of Ferndale, CA
  9. 1.5 17km E of Rio Dell, CA
  10. 2.1 18km WNW of Ferndale, CA
  11. 2.3 15km E of Willow Creek, CA
  12. 4.1 3km SSE of Fortuna, CA
  13. 2.2 3km NW of Ferndale, CA
  14. 1.9 6km NNE of Hydesville, CA
  15. 2.6 5km NNE 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.8 on 2016-07-21 — it released about 72 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.