QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

275 km W of Ferndale, California

· 10 km deep · released about 950 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 (ml)
Depth
10 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1709 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 950 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 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 40.8643, -127.5018. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.0 253 km W of Indianola, California
  2. 2.8 231 km W of Ferndale, California
  3. 4.3 244 km W of Ferndale, California
  4. 2.9 277 km W of Ferndale, California
  5. 2.7 245 km W of Ferndale, California
  6. 3.2 249 km W of Ferndale, California
  7. 2.7 off the coast of Northern California
  8. 2.9 250 km W of Ferndale, California
  9. 2.9 253 km W of Ferndale, California
  10. 2.6 277 km W of Ferndale, California
  11. 2.9 238 km W of Ferndale, California
  12. 2.9 237 km W of Ferndale, California
  13. 2.8 251 km W of Ferndale, California
  14. 3.2 245 km W of Ferndale, California
  15. 3.4 258 km W of Ferndale, 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 5.3 on 2020-05-18 — it released about 2,800 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.