Earthquake · reviewed by a seismologist
M 3.4ml
Earthquake near East Quincy, CA
No earthquake was likely felt in East Quincy in the 24 hours to 3:34 pm PST (23:34 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 3.4 earthquake was recorded 4 km (3 mi) east-northeast of East Quincy, CA, at 6:19 am PST on 11 December 2023 (14:19 UTC), less than 1 km deep. 81 people have reported feeling it to USGS.
USGS: 4 km ENE of East Quincy, CA
96 km (60 mi) WNW of Reno, NV
- When
- 6:19 am PST on 11 December 2023 ()
- Where
- 4 km (3 mi) east-northeast of East Quincy, CA · earthquakes near East Quincy
- Magnitude
- M 3.4 (ml)
- Depth
- -0.1 km below the surface
- Felt
- 81 reports · strongest reported intensity V
- Nearest
- Plumas County, 5 km NNE
- Nearest mapped fault
- Mohawk Valley fault, 9 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 319 days ago
Earthquake alerts for East Quincy, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 55 km (34 mi) from the epicentre. In East Quincy, 4 km away, the estimate is intensity III (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.
Likely felt in: East Quincy 4 km, intensity III · Greenville 23 km, intensity III · Portola 36 km, intensity II · Westwood 42 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 1.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 110,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 4,700× the energy of this one
- Magna, Utah 2020 M 5.7 3,300× the energy of this one
- This earthquake M 3.4 about 1.6 tons of TNT
- Around the size people start to feel M 3.0 this one released 3.3× more
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 5.5 on 2023-05-11 — about 1,600 times the energy of this one.
Before 2016, the USGS record lists 2 earthquakes of M5 or more within 50 km:
- 5.7 2 km NNE of Canyondam, California · 32 km NNW of this epicentre
- 5.2 3 km N of Blairsden, California · 25 km SE 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 39.9480, -120.8488. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Plumas County, CA | 5 km (3 mi) | NNE | earthquakes near Plumas County |
| Sierra County, CA | 50 km (31 mi) | SE | earthquakes near Sierra County |
| Butte County, CA | 72 km (45 mi) | WSW | earthquakes near Butte County |
| Nevada County, CA | 73 km (45 mi) | S | earthquakes near Nevada County |
| Yuba County, CA | 87 km (54 mi) | SSW | earthquakes near Yuba County |
| Lassen County, CA | 87 km (54 mi) | NNE | earthquakes near Lassen County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 2.1 3 km NE of Almanor, CA
- 2.5 1 km ENE of Prattville, CA
- 2.9 0 km NNE of Whitehawk, CA
- 2.6 4 km S of Caribou, CA
- 2.4 1 km N of Almanor, CA
- 2.1 4 km WNW of Canyondam, CA
- 2.6 4 km WNW of Canyondam, CA
- 2.1 3 km NNE of Prattville, CA
- 2.3 3 km E of Prattville, CA
- 2.1 1 km W of Canyondam, CA
- 1.9 2 km NNE of Prattville, CA
- 1.7 3 km NW of Canyondam, CA
- 2.3 4 km S of Cromberg, CA
- 1.9 2 km NNW of Almanor, CA
- 2.0 1 km NNW of Almanor, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.