QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

14 km E of Redcrest, California

· 25 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 35 kmTrinity County 62 kmMendocino County 113 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
25 km below the surface
Felt
no reports yet
Nearest
Humboldt County, 35 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3364 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 13 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× the energy of this one
  4. This earthquake M 1.8 about 13 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 40.4125, -123.7837. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humboldt County, CA 35 km (22 mi) SSE of here earthquakes near Humboldt County
Trinity County, CA 62 km (39 mi) WSW of here earthquakes near Trinity County
Mendocino County, CA 113 km (70 mi) NNW of here earthquakes near Mendocino County
Glenn County, CA 148 km (92 mi) NW of here earthquakes near Glenn County

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

Aftershocks so far

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

  1. 2.8 5km NE of Hydesville, CA
  2. 2.8 4km SSW of Humboldt Hill, CA
  3. 2.1 5km SW of Humboldt Hill, CA
  4. 1.8 15km ESE of Hydesville, CA
  5. 1.9 1km NE of Redway, CA
  6. 2.1 24km SE of Willow Creek, CA
  7. 1.8 38km SSW of Hayfork, CA
  8. 2.1 15km S of Willow Creek, CA
  9. 2.4 10 km SSW of Ferndale, California
  10. 2.2 10 km SSW of Ferndale, California
  11. 2.2 near the coast of Northern California
  12. 2.0 9 km SSW of Ferndale, California
  13. 2.7 9 km SSW of Ferndale, California
  14. 2.5 16 km WSW of Burnt Ranch, California
  15. 1.8 17 km WSW of Mad River, 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 4.8 on 2016-07-21 — it released about 38,000 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.