Earthquake · reviewed by a seismologist
M 1.8md
Earthquake near Red Bluff, CA
No earthquake was likely felt in Red Bluff in the 24 hours to 1:48 am PST (09:48 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 1.8 earthquake was recorded 20 km (13 mi) northeast of Red Bluff, CA, at 2:57 am PDT on 27 August 2019 (09:57 UTC), 12 km deep.
USGS: 20km NE of Red Bluff, CA
66 km (41 mi) NNW of Chico, CA · 37 km (23 mi) SE of Redding, CA
- When
- 2:57 am PDT on 27 August 2019 ()
- Where
- 20 km (13 mi) northeast of Red Bluff, CA · earthquakes near Red Bluff
- Magnitude
- M 1.8 (md)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Tehama County, 25 km SSW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2633 days ago
Earthquake alerts for Red Bluff, 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 7 km (4 mi) from the epicentre. In Red Bluff, 20 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: Anderson, Shingletown, Gerber.
How big was it?
This earthquake released about 15 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 1,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 710,000× the energy of this one
- Around the size people start to feel M 3.0 63× the energy of this one
- This earthquake M 1.8 about 15 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:
- 5.1 7km NW of Redding, CA · 44 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 40.3210, -122.0832. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Tehama County, CA | 25 km (16 mi) | SSW | earthquakes near Tehama County |
| Shasta County, CA | 49 km (30 mi) | N | earthquakes near Shasta County |
| Butte County, CA | 84 km (52 mi) | SSE | earthquakes near Butte County |
| Glenn County, CA | 84 km (52 mi) | SSW | earthquakes near Glenn County |
| Trinity County, CA | 95 km (59 mi) | WNW | earthquakes near Trinity County |
| Plumas County, CA | 113 km (70 mi) | ESE | earthquakes near Plumas County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
53 earthquakes have been recorded within 50 km since this one.
- 1.6 2km WSW of Shasta Lake, CA
- 1.6 15km ESE of Anderson, CA
- 1.8 11km NW of Shingletown, CA
- 1.6 4km NNW of Palo Cedro, CA
- 2.1 6km NE of Gerber, CA
- 1.6 12km ESE of Viola, CA
- 2.2 12km ESE of Viola, CA
- 1.7 16km NNW of Shingletown, CA
- 1.6 16km NNW of Shingletown, CA
- 1.8 11km NW of Viola, CA
- 1.9 16km ESE of Anderson, CA
- 1.8 5km SE of Bella Vista, CA
- 1.9 5km WNW of Bella Vista, CA
- 1.6 15km NNE of Shingletown, CA
- 2.1 4km W of Bella Vista, 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.