QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

15km SSW of Susanville, CA

· 2.8 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 35 kmLassen County 47 kmSierra County 82 kmWashoe County 102 kmButte County 103 kmNevada County 111 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 1.8 (md)
Depth
2.8 km below the surface
Felt
no reports yet
Nearest
Plumas County, 35 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2748 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 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 40.2985, -120.7210. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 35 km (22 mi) NNE of here earthquakes near Plumas County
Lassen County, CA 47 km (29 mi) S of here earthquakes near Lassen County
Sierra County, CA 82 km (51 mi) NNW of here earthquakes near Sierra County
Washoe County, NV 102 km (63 mi) WSW of here earthquakes near Washoe County
Butte County, CA 103 km (64 mi) NE of here earthquakes near Butte County
Nevada County, CA 111 km (69 mi) N of here earthquakes near Nevada County

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

Aftershocks so far

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

  1. 1.5 6 km ENE of East Quincy, California
  2. 1.6 3km NE of Canyondam, CA
  3. 2.3 15km SE of Honey Lake, CA
  4. 2.1 6km NNW of Greenville, CA
  5. 2.0 3km NNE of Spring Garden, CA
  6. 3.1 2km NE of Prattville, CA
  7. 1.6 9 km NNW of Greenhorn, California
  8. 1.8 7km SW of Susanville, CA
  9. 1.6 30km NNE of Hamilton Branch, CA
  10. 1.5 15km ENE of East Shore, CA
  11. 1.7 5km NE of Canyondam, CA
  12. 3.1 5km NE of East Quincy, CA
  13. 1.6 3km SSW of East Shore, CA
  14. 1.5 4km NNW of Almanor, CA
  15. 2.3 4km N of Almanor, 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 12,000 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.