QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near Yuba City, CA

No earthquake was likely felt in Yuba City in the 24 hours to 3:12 am PST (11:12 UTC). The last one was M 5.6, 141 km (88 mi) W, at 8:10 am PDT on 24 June 2026, estimated intensity III (weak) in town; 5,311 felt reports to USGS. Every earthquake near Yuba City

This page: a magnitude 1.8 earthquake was recorded 43 km (27 mi) northeast of Yuba City, CA, at 6:31 am PDT on 27 September 2017 (13:31 UTC), 13 km deep.

USGS: 4 km NW of Dobbins, California

94 km (59 mi) NNE of Sacramento, CA · 45 km (28 mi) NE of Yuba City, CA

6:31 am PDT, Sep 27, 2017 · · 13 km deep · released about 14 lb of TNT

Every earthquake near Yuba City Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Yuba County 17 kmNevada County 42 kmButte County 43 kmSutter County 57 kmPlacer County 58 kmSierra County 65 kmPlumas County 75 kmColusa County 89 kmEl Dorado County 92 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
6:31 am PDT on 27 September 2017 ()
Where
43 km (27 mi) northeast of Yuba City, CA · earthquakes near Yuba City
Magnitude
M 1.8 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Yuba County, 17 km SSW
Nearest mapped fault
Foothills fault system, 14 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3333 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 3 km (2 mi) from the epicentre. In Yuba City, 43 km away, the estimate is intensity I (not felt). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Challenge-Brownsville, Loma Rica, Lake Wildwood, Penn Valley, Oroville East, Nevada City.

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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

  1. 5.9 West of Downieville, California · 24 km ENE of this epicentre
  2. 5.7 The 1975 Oroville, California Earthquake · 26 km W of this epicentre
  3. 5.2 4 km E of Palermo, California · 21 km WNW of this epicentre
  4. 5.1 5 km ENE of Palermo, California · 21 km WNW of this epicentre
  5. 5.0 Nevada County, California · 30 km E of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 39.3983, -121.2437. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Yuba County, CA 17 km (10 mi) SSW earthquakes near Yuba County
Nevada County, CA 42 km (26 mi) ESE earthquakes near Nevada County
Butte County, CA 43 km (27 mi) NW earthquakes near Butte County
Sutter County, CA 57 km (35 mi) SW earthquakes near Sutter County
Placer County, CA 58 km (36 mi) SE earthquakes near Placer County
Sierra County, CA 65 km (40 mi) ENE earthquakes near Sierra County

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

Aftershocks so far

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

  1. 1.6 10km E of Loma Rica, CA
  2. 1.9 10km ENE of Loma Rica, CA
  3. 1.7 10km N of Thermalito, CA
  4. 2.3 5km NNE of Little Grass Valley, CA
  5. 2.1 6km S of Bucks Lake, CA
  6. 2.1 8km W of La Porte, CA
  7. 2.3 22km SW of Whitehawk, CA
  8. 1.9 10km NNW of Oroville, CA
  9. 2.5 4km SE of Concow, CA
  10. 1.9 10km N of Oroville, CA
  11. 1.9 4km ENE of Palermo, CA
  12. 1.6 8km W of La Porte, CA
  13. 2.2 11km N of Oroville, CA
  14. 2.3 12km W of La Porte, CA
  15. 1.7 12km W of Loma Rica, 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.