QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6ml

7 km NW of Montgomery Creek, California

· 17 km deep · released about 4.5 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Shasta County 15 kmTehama County 88 kmSiskiyou County 90 kmTrinity County 99 kmLassen County 116 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 3.6 (ml)
Depth
17 km below the surface
Felt
28 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Shasta County, 15 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1565 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 28 people have reported feeling it to USGS.

How big was it?

This earthquake released about 4.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 38,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,700× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,200× the energy of this one
  4. This earthquake M 3.6 about 4.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 9.4× more

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 40.8913, -121.9837. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Shasta County, CA 15 km (10 mi) NNE of here earthquakes near Shasta County
Tehama County, CA 88 km (54 mi) NNE of here earthquakes near Tehama County
Siskiyou County, CA 90 km (56 mi) SSE of here earthquakes near Siskiyou County
Trinity County, CA 99 km (62 mi) ENE of here earthquakes near Trinity County
Lassen County, CA 116 km (72 mi) W of here earthquakes near Lassen County
Modoc County, CA 131 km (82 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. 2.5 6km ENE of Redding, CA
  2. 1.5 1km WNW of Palo Cedro, CA
  3. 1.9 25km SE of Burney, CA
  4. 1.5 2km W of Palo Cedro, CA
  5. 2.4 1km SW of Palo Cedro, CA
  6. 1.5 12km N of Burney, CA
  7. 2.6 18km N of Big Bend, CA
  8. 2.0 10km SSW of Big Bend, CA
  9. 2.2 2km E of Shasta Lake, CA
  10. 1.5 3km E of Millville, CA
  11. 1.7 8km NE of Burney, CA
  12. 2.2 10km NE of Burney, CA
  13. 1.9 10km NNE of Shasta Lake, CA
  14. 2.0 2km ENE of Shasta Lake, CA
  15. 1.7 9km NE 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.