QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

2 km NNE of Cromberg, California

· 11 km deep · released about 8.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 18 kmSierra County 36 kmNevada County 66 kmButte County 83 kmYuba County 89 kmPlacer County 91 kmLassen County 93 kmStorey County 110 kmCarson City 113 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 1.6 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Plumas County, 18 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3009 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 8.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 8.4 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 39.8827, -120.6727. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Plumas County, CA 18 km (11 mi) SE of here earthquakes near Plumas County
Sierra County, CA 36 km (23 mi) NNW of here earthquakes near Sierra County
Nevada County, CA 66 km (41 mi) N of here earthquakes near Nevada County
Butte County, CA 83 km (52 mi) ENE of here earthquakes near Butte County
Yuba County, CA 89 km (55 mi) NE of here earthquakes near Yuba County
Placer County, CA 91 km (57 mi) N of here earthquakes near Placer County

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

Aftershocks so far

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

  1. 1.9 4 km SSE of Sierra City, California
  2. 1.6 3 km SSE of Gold Mountain, California
  3. 2.1 1 km SE of Canyondam, California
  4. 1.6 1 km SW of Greenhorn, California
  5. 1.5 3 km E of Canyondam, California
  6. 2.2 6 km WNW of Sierra City, California
  7. 1.8 2 km S of Canyondam, California
  8. 2.1 3 km N of Canyondam, California
  9. 1.7 4 km ESE of La Porte, California
  10. 1.6 6 km NE of Graniteville, California
  11. 1.6 6 km NNE of Greenhorn, California
  12. 1.6 4 km WSW of Cromberg, California
  13. 1.6 2 km ENE of Canyondam, California
  14. 1.8 2 km ESE of Taylorsville, California
  15. 1.8 4 km S of Spring Garden, California

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 19,000 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.