QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

4 km ESE of La Porte, California

· 4.4 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sierra County 37 kmPlumas County 38 kmNevada County 43 kmYuba County 56 kmButte County 56 kmPlacer County 69 kmSutter County 96 kmEl Dorado County 104 kmCarson City 117 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 1.7 (md)
Depth
4.4 km below the surface
Felt
no reports yet
Nearest
Sierra County, 37 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3389 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 970,000× the energy of this one
  3. Around the size people start to feel M 3.0 86× the energy of this one
  4. This earthquake M 1.7 about 11 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 39.6633, -120.9432. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sierra County, CA 37 km (23 mi) WNW of here earthquakes near Sierra County
Plumas County, CA 38 km (24 mi) SSW of here earthquakes near Plumas County
Nevada County, CA 43 km (27 mi) NNW of here earthquakes near Nevada County
Yuba County, CA 56 km (35 mi) NE of here earthquakes near Yuba County
Butte County, CA 56 km (35 mi) E of here earthquakes near Butte County
Placer County, CA 69 km (43 mi) NNW of here earthquakes near Placer County

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

Aftershocks so far

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

  1. 2.1 2km SW of Spring Garden, CA
  2. 1.8 4km NE of Challenge-Brownsville, CA
  3. 1.9 1km NW of Lake Davis, CA
  4. 1.7 2km N of Plumas Eureka, CA
  5. 2.2 2km NNE of Indian Falls, CA
  6. 2.9 18km SW of Whitehawk, CA
  7. 2.2 3km SE of Belden, CA
  8. 1.5 3 km SSW of Greenville, California
  9. 2.2 12km WNW of Lake Davis, CA
  10. 1.9 3km W of Delleker, CA
  11. 1.8 5km SSW of Cromberg, CA
  12. 1.6 4km WSW of Johnsville, CA
  13. 2.0 3km WSW of Cromberg, CA
  14. 1.5 18km SSW of Whitehawk, CA
  15. 1.6 2km SW of Cromberg, 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.