QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0md

131km WNW of Trinidad, CA

· 4.9 km deep · released about 800 lb 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 3.0 (md)
Depth
4.9 km below the surface
Felt
1 report · strongest reported intensity III
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2122 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 800 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 6.7 420,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 19,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 13,000× the energy of this one
  4. This earthquake M 3.0 about 800 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 41.2860, -125.6808. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.8 94 km W of Trinidad, CA
  2. 4.8 89 km WSW of Crescent City, CA
  3. 2.9 108 km WNW of Ferndale, CA
  4. 2.1 140 km W of Crescent City, California
  5. 3.3 126 km WSW of Crescent City, CA
  6. 2.7 167 km W of Big Lagoon, California
  7. 3.1 149 km W of Crescent City, CA
  8. 3.6 146 km WNW of Trinidad, CA
  9. 2.5 163 km WNW of Indianola, California
  10. 2.9 106 km WNW of Trinidad, CA
  11. 2.8 109 km WNW of Trinidad, CA
  12. 2.5 93 km WNW of Bayview, CA
  13. 2.1 118 km WSW of Crescent City, California
  14. 2.9 109 km WNW of Trinidad, CA
  15. 1.6 105 km WSW of Crescent City, California

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 4.6 on 2017-07-29 — it released about 280 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.