Earthquake · reviewed by a seismologist
M 2.6md
Earthquake near Red Bluff, CA
No earthquake was likely felt in Red Bluff in the 24 hours to 4:02 am PST (12:02 UTC). The last one was M 4.0, 97 km (60 mi) SW, at 5:01 am PDT on 28 October 2026, estimated intensity II (weak) in town; 14 felt reports to USGS. Every earthquake near Red Bluff
This page: a magnitude 2.6 earthquake was recorded 33 km (21 mi) east-northeast of Red Bluff, CA, at 6:19 am PDT on 18 April 2023 (13:19 UTC), 6.5 km deep.
USGS: 13km S of Manton, CA
61 km (38 mi) N of Chico, CA · 51 km (31 mi) SE of Redding, CA
- When
- 6:19 am PDT on 18 April 2023 ()
- Where
- 33 km (21 mi) east-northeast of Red Bluff, CA · earthquakes near Red Bluff
- Magnitude
- M 2.6 (md)
- Depth
- 6.5 km below the surface
- Felt
- no reports yet
- Nearest
- Tehama County, 36 km WSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1228 days ago
Earthquake alerts for Red Bluff, CA
Get a notification in this browser when USGS records an earthquake near Red Bluff, CA. No account or email needed.
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 22 km (14 mi) from the epicentre. In Red Bluff, 33 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: Shingletown 21 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 220 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 70,000× the energy of this one
- Magna, Utah 2020 M 5.7 50,000× the energy of this one
- Around the size people start to feel M 3.0 4.4× the energy of this one
- This earthquake M 2.6 about 220 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 · 38 km ENE 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 40.3065, -121.8800. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Tehama County, CA | 36 km (22 mi) | WSW | earthquakes near Tehama County |
| Shasta County, CA | 52 km (33 mi) | NNW | earthquakes near Shasta County |
| Butte County, CA | 75 km (47 mi) | SSE | earthquakes near Butte County |
| Glenn County, CA | 90 km (56 mi) | SSW | earthquakes near Glenn County |
| Plumas County, CA | 96 km (60 mi) | ESE | earthquakes near Plumas County |
| Trinity County, CA | 111 km (69 mi) | WNW | earthquakes near Trinity County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
44 earthquakes have been recorded within 50 km since this one.
- 1.7 17 km N of Viola, CA
- 2.1 15 km N of Viola, CA
- 2.3 14 km NW of Belden, CA
- 2.1 11 km SE of Mineral, CA
- 1.7 15 km NNE of Mineral, CA
- 1.9 10 km SW of Manton, CA
- 2.1 19 km S of Mineral, CA
- 1.6 14 km WSW of Chester, CA
- 2.6 14 km NNE of Shingletown, CA
- 1.9 14 km NNE of Shingletown, CA
- 1.5 6 km N of Millville, CA
- 1.8 15 km WSW of Chester, CA
- 1.6 24 km SSE of Mineral, CA
- 1.6 3 km WSW of Bella Vista, CA
- 1.7 18 km S 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.