Earthquake · reviewed by a seismologist
M 1.8md
Earthquake near Shingletown, CA
No earthquake was likely felt in Shingletown in the 24 hours to 5:41 am PST (13:41 UTC). The last one was M 5.6, 170 km (106 mi) SW, at 8:10 am PDT on 24 June 2026, estimated intensity III (weak) in town; 5,311 felt reports to USGS. Every earthquake near Shingletown
This page: a magnitude 1.8 earthquake was recorded 13 km (8 mi) north-northeast of Shingletown, CA, at 4:11 pm PDT on 17 March 2021 (23:11 UTC), 6.8 km deep.
USGS: 13km NNE of Shingletown, CA
93 km (58 mi) N of Chico, CA · 47 km (29 mi) E of Redding, CA
- When
- 4:11 pm PDT on 17 March 2021 ()
- Where
- 13 km (8 mi) north-northeast of Shingletown, CA · earthquakes near Shingletown
- Magnitude
- M 1.8 (md)
- Depth
- 6.8 km below the surface
- Felt
- no reports yet
- Nearest
- Shasta County, 27 km NW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2066 days ago
Earthquake alerts for Shingletown, 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 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 12 km (7 mi) from the epicentre. In Shingletown, 13 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.
How big was it?
This earthquake released about 16 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.
- Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
- Magna, Utah 2020 M 5.7 680,000× the energy of this one
- Around the size people start to feel M 3.0 61× the energy of this one
- This earthquake M 1.8 about 16 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 one earthquake of M5 or more within 50 km:
- 5.5 15 km NE of Mineral, California · 33 km ESE 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 40.5928, -121.8145. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Shasta County, CA | 27 km (17 mi) | NW | earthquakes near Shasta County |
| Tehama County, CA | 63 km (39 mi) | SW | earthquakes near Tehama County |
| Lassen County, CA | 102 km (63 mi) | E | earthquakes near Lassen County |
| Butte County, CA | 105 km (65 mi) | S | earthquakes near Butte County |
| Plumas County, CA | 107 km (67 mi) | SE | earthquakes near Plumas County |
| Trinity County, CA | 110 km (68 mi) | W | earthquakes near Trinity County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
50 earthquakes have been recorded within 50 km since this one.
- 1.6 15km NNE of Mineral, CA
- 1.9 12km ESE of Viola, CA
- 1.5 1km NW of Palo Cedro, CA
- 1.5 1km NW of Palo Cedro, CA
- 1.6 1km SW of Palo Cedro, CA
- 1.7 2km WSW of Palo Cedro, CA
- 1.6 2km W of Palo Cedro, CA
- 1.5 6km ESE of Bella Vista, CA
- 1.6 15km SSW of Mineral, CA
- 1.6 15km SSW of Mineral, CA
- 1.6 10km NNE of Mineral, CA
- 1.6 11km NNE of Mineral, CA
- 1.7 11km NNE of Mineral, CA
- 1.5 10km NNE of Mineral, CA
- 1.9 10km NNE of Mineral, 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.