QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

5km E of Johnstonville, CA

· 0.9 km deep · released about 82 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lassen County 37 kmPlumas County 51 kmWashoe County 82 kmSierra County 90 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 2.3 (md)
Depth
0.9 km below the surface
Felt
11 reports · strongest reported intensity III
Nearest
Lassen County, 37 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2881 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 11 people have reported feeling it to USGS.

How big was it?

This earthquake released about 82 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 82 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 40.3867, -120.5233. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lassen County, CA 37 km (23 mi) SSE of here earthquakes near Lassen County
Plumas County, CA 51 km (32 mi) NNE of here earthquakes near Plumas County
Washoe County, NV 82 km (51 mi) WSW of here earthquakes near Washoe County
Sierra County, CA 90 km (56 mi) N of here earthquakes near Sierra County
Butte County, CA 122 km (76 mi) NE of here earthquakes near Butte County
Storey County, NV 136 km (84 mi) NW of here earthquakes near Storey County

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

Aftershocks so far

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

  1. 1.8 4km SSE of East Shore, CA
  2. 1.5 8 km ESE of Milford, California
  3. 2.3 15km NNW of Susanville, CA
  4. 2.3 10km ESE of Taylorsville, CA
  5. 1.5 3 km N of Indian Falls, California
  6. 2.4 3km ESE of Janesville, CA
  7. 2.3 11km NE of Cromberg, CA
  8. 1.9 3km SE of Taylorsville, CA
  9. 1.5 14km NNE of Hamilton Branch, CA
  10. 2.4 4km SE of Taylorsville, CA
  11. 1.9 9km WSW of Susanville, CA
  12. 1.8 3km NE of Greenville, CA
  13. 1.7 15km SSW of Susanville, CA
  14. 1.8 15km SSW of Susanville, CA
  15. 1.8 4km W of Taylorsville, 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 4.5 on 2016-08-04 — it released about 1,900 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.