QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

7km W of Weitchpec, CA

· 28 km deep · released about 420 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 55 kmDel Norte County 64 kmTrinity County 83 kmSiskiyou County 114 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 2.8 (ml)
Depth
28 km below the surface
Felt
no reports yet
Nearest
Humboldt County, 55 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1653 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 420 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 36,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 26,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.3× the energy of this one
  4. This earthquake M 2.8 about 420 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 41.1895, -123.7947. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Humboldt County, CA 55 km (34 mi) NNE of here earthquakes near Humboldt County
Del Norte County, CA 64 km (40 mi) SSE of here earthquakes near Del Norte County
Trinity County, CA 83 km (52 mi) NW of here earthquakes near Trinity County
Siskiyou County, CA 114 km (71 mi) WSW of here earthquakes near Siskiyou County

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

Aftershocks so far

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

  1. 1.9 17 km SE of Willow Creek, CA
  2. 2.6 13 km NNW of Trinidad, CA
  3. 2.9 4 km SW of Westhaven-Moonstone, CA
  4. 2.8 1 km SSE of Arcata, CA
  5. 2.2 32 km ENE of Willow Creek, CA
  6. 2.3 17 km NE of Willow Creek, CA
  7. 2.1 18 km WNW of Willow Creek, CA
  8. 2.4 14 km SE of Weitchpec, CA
  9. 3.8 14 km W of McKinleyville, CA
  10. 2.0 13 km SSE of Willow Creek, CA
  11. 2.3 6 km WSW of Arcata, CA
  12. 2.5 22km S of Klamath, CA
  13. 2.8 10km S of Somes Bar, CA
  14. 2.0 15km SE of Blue Lake, CA
  15. 2.1 18km S 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 4.4 on 2019-02-06 — it released about 280 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.