QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

11km NNE of Lewiston, CA

· 9.3 km deep · released about 20 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Trinity County 34 kmShasta County 61 kmTehama County 87 kmSiskiyou County 90 kmHumboldt County 98 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 1.9 (md)
Depth
9.3 km below the surface
Felt
no reports yet
Nearest
Trinity County, 34 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1504 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 20 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 760,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 540,000× the energy of this one
  3. Around the size people start to feel M 3.0 48× the energy of this one
  4. This earthquake M 1.9 about 20 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 40.7988, -122.7632. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Trinity County, CA 34 km (21 mi) ENE of here earthquakes near Trinity County
Shasta County, CA 61 km (38 mi) W of here earthquakes near Shasta County
Tehama County, CA 87 km (54 mi) NNW of here earthquakes near Tehama County
Siskiyou County, CA 90 km (56 mi) SSW of here earthquakes near Siskiyou County
Humboldt County, CA 98 km (61 mi) E of here earthquakes near Humboldt County
Del Norte County, CA 147 km (91 mi) SE of here earthquakes near Del Norte County

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

Aftershocks so far

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

  1. 1.7 9 km NE of Shasta Lake, CA
  2. 1.8 20 km N of Bella Vista, CA
  3. 1.9 3 km S of Shasta Lake, CA
  4. 1.7 9 km NE of Shasta Lake, CA
  5. 1.6 3 km WSW of Bella Vista, CA
  6. 1.8 9 km NE of Shasta Lake, CA
  7. 2.1 14 km N of Hayfork, CA
  8. 1.7 24 km NNE of French Gulch, CA
  9. 1.8 26 km N of Shasta Lake, CA
  10. 1.9 4 km E of Redding, CA
  11. 1.8 26 km N of Shasta Lake, CA
  12. 1.7 9 km NE of Shasta Lake, CA
  13. 1.5 25 km N of French Gulch, CA
  14. 1.5 0 km WSW of Shasta Lake, CA
  15. 2.4 18 km WSW of Shasta, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.