QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

Earthquake near East Quincy, CA

No earthquake was likely felt in East Quincy in the 24 hours to 2:05 pm PST (22:05 UTC). The last one was M 2.3, 6 km (3 mi) N, at 5:11 am PST on 7 November 2026, estimated intensity II (weak) in town. Every earthquake near East Quincy

This page: a magnitude 2.1 earthquake was recorded 19 km (12 mi) southeast of East Quincy, CA, at 1:09 am PST on 20 February 2026 (09:09 UTC), 9.5 km deep.

USGS: 5 km SSW of Cromberg, CA

81 km (50 mi) WNW of Reno, NV

1:09 am PST, Feb 20, 2026 · · 9.5 km deep · released about 43 lb of TNT

Every earthquake near East Quincy Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Plumas County 21 kmSierra County 32 kmNevada County 58 kmButte County 77 kmYuba County 81 kmPlacer County 85 kmLassen County 100 kmStorey County 112 kmCarson City 112 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
1:09 am PST on 20 February 2026 ()
Where
19 km (12 mi) southeast of East Quincy, CA · earthquakes near East Quincy
Magnitude
M 2.1 (md)
Depth
9.5 km below the surface
Felt
no reports yet
Nearest
Plumas County, 21 km NNW
Nearest mapped fault
Mohawk Valley fault, 5 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 258 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 14 km (9 mi) from the epicentre. In East Quincy, 19 km away, the estimate is intensity II (weak). 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: Portola, Quincy.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 · 43 km SSW of this epicentre
  2. 5.7 2 km NNE of Canyondam, California · 50 km NW of this epicentre
  3. 5.6 5 km NE of Loyalton, California · 47 km ESE of this epicentre
  4. 5.2 3 km N of Blairsden, California · 10 km E of this epicentre
  5. 5.0 Nevada County, California · 49 km SSW 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 39.8222, -120.7278. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Plumas County, CA 21 km (13 mi) NNW earthquakes near Plumas County
Sierra County, CA 32 km (20 mi) SSE earthquakes near Sierra County
Nevada County, CA 58 km (36 mi) S earthquakes near Nevada County
Butte County, CA 77 km (48 mi) WSW earthquakes near Butte County
Yuba County, CA 81 km (50 mi) SW earthquakes near Yuba County
Placer County, CA 85 km (53 mi) S earthquakes near Placer County

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

Aftershocks so far

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

  1. 2.1 8 km WNW of La Porte, CA
  2. 1.8 2 km SW of Canyondam, CA
  3. 2.1 3 km WSW of Canyondam, CA
  4. 2.6 8 km NE of Lake Davis, CA
  5. 2.3 8 km NE of Lake Davis, CA
  6. 2.2 8 km NE of Lake Davis, CA
  7. 2.0 5 km SSW of Cromberg, CA
  8. 3.0 4 km WSW of Johnsville, CA
  9. 1.9 3 km S of Canyondam, CA
  10. 2.4 5 km NW of Johnsville, CA
  11. 2.1 2 km WSW of Canyondam, CA
  12. 2.1 8 km NE of Lake Davis, CA
  13. 2.2 8 km NE of Lake Davis, CA
  14. 2.1 16 km SE of Whitehawk, CA
  15. 1.9 32 km S of Whitehawk, 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.