QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

6 km NW of Montgomery Creek, California

· 15 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 16 kmTehama County 88 kmSiskiyou County 91 kmTrinity County 100 kmLassen County 115 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 2.1 (md)
Depth
15 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Shasta County, 16 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3294 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 40.8902, -121.9675. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 16 km (10 mi) NNE of here earthquakes near Shasta County
Tehama County, CA 88 km (55 mi) NNE of here earthquakes near Tehama County
Siskiyou County, CA 91 km (56 mi) SSE of here earthquakes near Siskiyou County
Trinity County, CA 100 km (62 mi) ENE of here earthquakes near Trinity County
Lassen County, CA 115 km (71 mi) W of here earthquakes near Lassen County
Modoc County, CA 130 km (81 mi) SW of here earthquakes near Modoc County

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

Aftershocks so far

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

  1. 1.5 3km NW of Palo Cedro, CA
  2. 2.5 6km ENE of Redding, CA
  3. 1.5 1km WNW of Palo Cedro, CA
  4. 1.9 25km SE of Burney, CA
  5. 1.5 2km W of Palo Cedro, CA
  6. 2.4 1km SW of Palo Cedro, CA
  7. 1.5 12km N of Burney, CA
  8. 2.6 18km N of Big Bend, CA
  9. 2.0 10km SSW of Big Bend, CA
  10. 2.2 2km E of Shasta Lake, CA
  11. 1.5 3km E of Millville, CA
  12. 1.7 8km NE of Burney, CA
  13. 2.2 10km NE of Burney, CA
  14. 1.9 10km NNE of Shasta Lake, CA
  15. 2.0 2km ENE of Shasta Lake, 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.