QuakeIndex

Earthquake · automatic estimate, may change

M 2.4md

Earthquake near East Quincy, CA

No earthquake was likely felt in East Quincy in the 24 hours to 12:46 pm PST (20:46 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 2.4 earthquake was recorded 30 km (19 mi) south-southeast of East Quincy, CA, at 10:34 am PST on 4 February 2026 (18:34 UTC), 27 km deep. The magnitude and location are an automatic first estimate and may change.

USGS: 12 km SSW of Johnsville, CA

10:34 am PST, Feb 4, 2026 · · 27 km deep · released about 110 lb of TNT

Every earthquake near East Quincy Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sierra County 24 kmPlumas County 35 kmNevada County 43 kmYuba County 68 kmPlacer County 69 kmButte County 72 kmEl Dorado County 102 kmCarson City 105 kmSutter County 109 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
10:34 am PST on 4 February 2026 ()
Where
30 km (19 mi) south-southeast of East Quincy, CA · earthquakes near East Quincy
Magnitude
M 2.4 (md)
Depth
27 km below the surface
Felt
no reports yet
Nearest
Sierra County, 24 km ESE
Nearest mapped fault
Mohawk Valley fault, 16 km from its surface trace — near is not the same as on
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 281 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In East Quincy, 30 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.

How big was it?

This earthquake released about 110 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 140,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 99,000× the energy of this one
  3. Around the size people start to feel M 3.0 8.8× the energy of this one
  4. This earthquake M 2.4 about 110 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

The largest earthquake within 50 km since 2016 was M 4.7 on 2021-05-07 — about 2,600 times the energy of this one.

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

  1. 5.9 West of Downieville, California · 29 km SW of this epicentre
  2. 5.6 5 km NE of Loyalton, California · 48 km E of this epicentre
  3. 5.3 11 km N of Soda Springs, California · 42 km SE of this epicentre
  4. 5.2 3 km N of Blairsden, California · 18 km NE of this epicentre
  5. 5.0 Nevada County, California · 34 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 39.6858, -120.7577. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Sierra County, CA 24 km (15 mi) ESE earthquakes near Sierra County
Plumas County, CA 35 km (21 mi) N earthquakes near Plumas County
Nevada County, CA 43 km (27 mi) S earthquakes near Nevada County
Yuba County, CA 68 km (42 mi) SW earthquakes near Yuba County
Placer County, CA 69 km (43 mi) S earthquakes near Placer County
Butte County, CA 72 km (45 mi) W earthquakes near Butte County

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

Aftershocks so far

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

  1. 2.7 1 km N of Lake Davis, CA
  2. 2.3 6 km N of East Quincy, CA
  3. 2.4 10 km N of Greenhorn, CA
  4. 2.3 2 km ENE of Keddie, CA
  5. 2.2 9 km S of Johnsville, CA
  6. 2.1 7 km NE of Lake Davis, CA
  7. 2.0 6 km E of Challenge-Brownsville, CA
  8. 2.1 8 km WNW of La Porte, CA
  9. 2.6 8 km NE of Lake Davis, CA
  10. 2.1 7 km ESE of Challenge-Brownsville, CA
  11. 2.3 8 km NE of Lake Davis, CA
  12. 2.2 8 km NE of Lake Davis, CA
  13. 2.0 5 km SSW of Cromberg, CA
  14. 3.0 4 km WSW of Johnsville, CA
  15. 2.4 5 km NW of Johnsville, 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.