QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

17 km WSW of Trinidad, California

· 4.4 km deep · released about 160 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 48 kmDel Norte County 88 kmTrinity County 111 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 2.5 (ml)
Depth
4.4 km below the surface
Felt
no reports yet
Nearest
Humboldt County, 48 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3399 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 160 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 95,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 68,000× the energy of this one
  3. Around the size people start to feel M 3.0 6× the energy of this one
  4. This earthquake M 2.5 about 160 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 41.0020, -124.3430. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humboldt County, CA 48 km (30 mi) NW of here earthquakes near Humboldt County
Del Norte County, CA 88 km (55 mi) SSW of here earthquakes near Del Norte County
Trinity County, CA 111 km (69 mi) WNW of here earthquakes near Trinity County

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

Aftershocks so far

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

  1. 2.4 14km ESE of Blue Lake, CA
  2. 4.4 13km ESE of Blue Lake, CA
  3. 3.0 5km E of Pine Hills, CA
  4. 2.4 5km E of Pine Hills, CA
  5. 2.9 44km WNW of Bayview, CA
  6. 2.4 6km WSW of Ferndale, CA
  7. 2.3 20km NNW of Trinidad, CA
  8. 2.6 7km SE of Pine Hills, CA
  9. 2.2 15km W of Humboldt Hill, CA
  10. 2.5 14km W of Humboldt Hill, CA
  11. 3.2 15km NE of Westhaven-Moonstone, CA
  12. 2.1 6km E of Fortuna, CA
  13. 1.9 2km SW of Arcata, CA
  14. 2.8 28km NW of Ferndale, CA
  15. 1.8 15km SE of Blue Lake, 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 3,100 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.