QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

14km ESE of Willow Creek, CA

· 28 km deep · released about 380 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 41 kmHumboldt County 44 kmDel Norte County 103 kmSiskiyou County 110 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 2.7 (ml)
Depth
28 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Trinity County, 41 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3020 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 380 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 40,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 29,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.5× the energy of this one
  4. This earthquake M 2.7 about 380 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 40.9015, -123.4753. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 41 km (26 mi) NW of here earthquakes near Trinity County
Humboldt County, CA 44 km (27 mi) ENE of here earthquakes near Humboldt County
Del Norte County, CA 103 km (64 mi) SSE of here earthquakes near Del Norte County
Siskiyou County, CA 110 km (68 mi) SW of here earthquakes near Siskiyou County
Tehama County, CA 136 km (84 mi) NW of here earthquakes near Tehama 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. 3.0 27km WNW of Hayfork, CA
  2. 2.7 28km SSE of Somes Bar, CA
  3. 2.4 17km SE of Willow Creek, CA
  4. 2.0 11km WNW of Hayfork, CA
  5. 2.0 11km WNW of Hayfork, CA
  6. 1.6 30km S of Willow Creek, CA
  7. 1.8 16km ESE of Willow Creek, CA
  8. 2.6 21km NW of Weaverville, CA
  9. 2.0 35km W of Hayfork, CA
  10. 2.4 24km NNW of Hayfork, CA
  11. 1.8 17km ESE of Pine Hills, CA
  12. 1.9 8km S of Blue Lake, CA
  13. 2.3 24km E of Hydesville, CA
  14. 3.8 16km ESE of Pine Hills, CA
  15. 2.9 22km NNW of Hayfork, 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 1,300 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.