QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6mw

99km W of Trinidad, CA

· 4.9 km deep · released about 3.8 tons of TNT

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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
4.9 km below the surface
Felt
4 reports · strongest reported intensity III
Measured shaking
intensity II (ShakeMap)
Nearest
Humboldt County, 127 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1950 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.8 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 45,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,400× the energy of this one
  4. This earthquake M 3.6 about 3.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.9× 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 41.1562, -125.3175. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humboldt County, CA 127 km (79 mi) WNW of here earthquakes near Humboldt County
Del Norte County, CA 129 km (80 mi) WSW 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

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

  1. 2.8 67 km WNW of Bayview, CA
  2. 2.8 103 km WNW of Ferndale, CA
  3. 2.8 94 km W of Trinidad, CA
  4. 2.6 81 km WNW of Trinidad, CA
  5. 4.8 89 km WSW of Crescent City, CA
  6. 2.9 108 km WNW of Ferndale, CA
  7. 2.7 65 km WNW of Ferndale, CA
  8. 3.3 126 km WSW of Crescent City, CA
  9. 2.8 74 km WNW of Bayview, CA
  10. 3.3 83 km W of Trinidad, CA
  11. 4.5 74 km WNW of Ferndale, CA
  12. 3.6 146 km WNW of Trinidad, CA
  13. 2.9 106 km WNW of Trinidad, CA
  14. 2.9 90 km WNW of Bayview, CA
  15. 2.8 109 km WNW of Trinidad, 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 5.1 on 2017-07-29 — 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.