QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

35km S of Willow Creek, CA

· 24 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 25 kmTrinity County 45 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
24 km below the surface
Felt
no reports yet
Nearest
Humboldt County, 25 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1992 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 40.6268, -123.6458. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humboldt County, CA 25 km (16 mi) ESE of here earthquakes near Humboldt County
Trinity County, CA 45 km (28 mi) W of here earthquakes near Trinity County
Tehama County, CA 132 km (82 mi) WNW of here earthquakes near Tehama County
Siskiyou County, CA 142 km (88 mi) SW of here earthquakes near Siskiyou County
Glenn County, CA 155 km (97 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

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

  1. 1.8 20km SSE of Rio Dell, CA
  2. 1.9 20km SSE of Rio Dell, CA
  3. 2.3 20km NNE of Redway, CA
  4. 3.0 8km SSW of Rio Dell, CA
  5. 2.3 10km SE of Willow Creek, CA
  6. 1.8 11km SSE of Blue Lake, CA
  7. 1.8 4km N of Hydesville, CA
  8. 2.5 9km NNE of Hayfork, CA
  9. 2.2 9km ESE of Willow Creek, CA
  10. 2.4 21km SSE of Willow Creek, CA
  11. 2.0 28km NE of Redway, CA
  12. 2.5 8km E of Willow Creek, CA
  13. 1.9 13km ENE of Hydesville, CA
  14. 1.7 13km E of Hydesville, CA
  15. 2.1 7km SSE of Pine Hills, 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 34,000 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.