QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

27km SSE of Blue Lake, CA

· 26 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 9 kmTrinity County 60 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 1.8 (md)
Depth
26 km below the surface
Felt
no reports yet
Nearest
Humboldt County, 9 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1998 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 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 40.6765, -123.8245. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humboldt County, CA 9 km (6 mi) ESE of here earthquakes near Humboldt County
Trinity County, CA 60 km (37 mi) W of here earthquakes near Trinity County
Del Norte County, CA 120 km (75 mi) S of here earthquakes near Del Norte County
Siskiyou County, CA 148 km (92 mi) SW of here earthquakes near Siskiyou County

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

Aftershocks so far

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

  1. 1.7 12km SSW of Ferndale, CA
  2. 1.7 12km SSW of Ferndale, CA
  3. 2.6 6km ENE of Petrolia, CA
  4. 2.3 8km E of Willow Creek, CA
  5. 1.7 33km ENE of Hydesville, CA
  6. 2.5 19km SE of Bayside, CA
  7. 1.8 9km SSW of Ferndale, CA
  8. 1.6 9km SSW of Ferndale, CA
  9. 1.7 9km SSW of Ferndale, CA
  10. 2.0 11km SSW of Ferndale, CA
  11. 2.3 11km SSW of Ferndale, CA
  12. 1.8 9km W of Willow Creek, CA
  13. 2.4 36km NNE of Redway, CA
  14. 2.2 20km SE of Willow Creek, CA
  15. 2.1 16km ESE of Willow Creek, 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 32,000 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.