Earthquake · reviewed by a seismologist
M 2.1md
Earthquake near Greenville, CA
No earthquake was likely felt in Greenville in the 24 hours to 1:26 am PST (09:26 UTC). The last one was M 2.3, 18 km (11 mi) SSE, at 5:11 am PST on 7 November 2026, estimated intensity II (weak) in town. Every earthquake near Greenville
This page: a magnitude 2.1 earthquake was recorded 11 km (7 mi) west-northwest of Greenville, CA, at 3:25 pm PST on 18 December 2018 (23:25 UTC), 3.5 km deep.
USGS: 0km ENE of Canyondam, CA
- When
- 3:25 pm PST on 18 December 2018 ()
- Where
- 11 km (7 mi) west-northwest of Greenville, CA · earthquakes near Greenville
- Magnitude
- M 2.1 (md)
- Depth
- 3.5 km below the surface
- Felt
- no reports yet
- Nearest
- Plumas County, 29 km SE
- Nearest mapped fault
- Almanor fault, 1 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 2886 days ago
Earthquake alerts for Greenville, CA
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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 17 km (11 mi) from the epicentre. In Greenville, 11 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.
Likely felt in: Greenville 11 km, intensity II · Westwood 16 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 40 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.
- Mineral, Virginia 2011 M 5.8 380,000× the energy of this one
- Magna, Utah 2020 M 5.7 270,000× the energy of this one
- Around the size people start to feel M 3.0 24× the energy of this one
- This earthquake M 2.1 about 40 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 2 earthquakes of M5 or more within 50 km:
- 5.7 2 km NNE of Canyondam, California · 2 km NNE of this epicentre
- 5.5 15 km NE of Mineral, California · 46 km NW 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 40.1723, -121.0707. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Plumas County, CA | 29 km (18 mi) | SE | earthquakes near Plumas County |
| Lassen County, CA | 71 km (44 mi) | NNE | earthquakes near Lassen County |
| Butte County, CA | 72 km (45 mi) | SW | earthquakes near Butte County |
| Sierra County, CA | 81 km (50 mi) | SE | earthquakes near Sierra County |
| Tehama County, CA | 99 km (61 mi) | W | earthquakes near Tehama County |
| Nevada County, CA | 101 km (63 mi) | SSE | earthquakes near Nevada 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.
- 2.3 11km NE of Cromberg, CA
- 1.8 6km WSW of Belden, CA
- 2.6 15km SE of Mineral, CA
- 1.8 15km ENE of Mineral, CA
- 2.1 16km NW of Chester, CA
- 1.9 9km SSE of Mineral, CA
- 1.6 7km NNE of Mineral, CA
- 1.7 16km WSW of Almanor, CA
- 1.6 19km WNW of Belden, CA
- 1.6 18km WSW of Almanor, CA
- 2.0 12km SSE of Bucks Lake, CA
- 1.5 4km WSW of Hamilton Branch, CA
- 2.2 2km ENE of Belden, CA
- 1.5 2km SW of Canyondam, CA
- 1.9 3km SE of Taylorsville, 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.