QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0md

22km E of Petrolia, CA

· 31 km deep · released about 33 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 45 kmTrinity County 86 kmMendocino County 109 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 2.0 (md)
Depth
31 km below the surface
Felt
no reports yet
Nearest
Humboldt County, 45 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1244 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 33 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 450,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 320,000× the energy of this one
  3. Around the size people start to feel M 3.0 29× the energy of this one
  4. This earthquake M 2.0 about 33 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 40.3075, -124.0262. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humboldt County, CA 45 km (28 mi) S of here earthquakes near Humboldt County
Trinity County, CA 86 km (53 mi) WSW of here earthquakes near Trinity County
Mendocino County, CA 109 km (68 mi) NNW of here earthquakes near Mendocino County

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

Aftershocks so far

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

  1. 1.8 14km WSW of Ferndale, CA
  2. 1.9 8km SW of Ferndale, CA
  3. 1.8 2km SW of Humboldt Hill, CA
  4. 1.6 9km SW of Ferndale, CA
  5. 1.8 21km NW of Petrolia, CA
  6. 1.7 13km SSW of Ferndale, CA
  7. 1.9 14km WSW of Ferndale, CA
  8. 1.6 14km NW of Petrolia, CA
  9. 2.3 10km NW of Petrolia, CA
  10. 1.7 2km SSE of Fortuna, CA
  11. 1.9 4km WNW of Ferndale, CA
  12. 1.9 14km WSW of Ferndale, CA
  13. 3.1 17km WSW of Petrolia, CA
  14. 2.6 25km WSW of Ferndale, CA
  15. 1.9 13km WSW of Ferndale, 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 6.4 on 2022-12-20 — it released about 3,600,000 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.