Earthquake · reviewed by a seismologist
M 1.8md
Earthquake near Shasta, CA
No earthquake was likely felt in Shasta in the 24 hours to 1:30 pm PST (21:30 UTC). The last one was M 2.3, 8 km (5 mi) SE, at 4:06 pm PDT on 4 October 2026, estimated intensity II (weak) in town. Every earthquake near Shasta
This page: a magnitude 1.8 earthquake was recorded 19 km (12 mi) southwest of Shasta, CA, at 10:28 pm PDT on 24 August 2023 (05:28 UTC), 18 km deep.
USGS: 19 km SW of Shasta, CA
25 km (16 mi) WSW of Redding, CA · 104 km (65 mi) NW of Chico, CA
- When
- 10:28 pm PDT on 24 August 2023 ()
- Where
- 19 km (12 mi) southwest of Shasta, CA · earthquakes near Shasta
- Magnitude
- M 1.8 (md)
- Depth
- 18 km below the surface
- Felt
- no reports yet
- Nearest
- Trinity County, 46 km WNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1172 days ago
Earthquake alerts for Shasta, 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 it was probably too small to be felt, even directly above it. In Shasta, 19 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: Redding, Anderson.
How big was it?
This earthquake released about 17 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 5.8 870,000× the energy of this one
- Magna, Utah 2020 M 5.7 620,000× the energy of this one
- Around the size people start to feel M 3.0 55× the energy of this one
- This earthquake M 1.8 about 17 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:
- 5.5 33 km NW of Rancho Tehama Reserve, California · 30 km SSW of this epicentre
- 5.1 7km NW of Redding, CA · 26 km NE 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 40.4630, -122.6273. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Trinity County, CA | 46 km (29 mi) | WNW | earthquakes near Trinity County |
| Tehama County, CA | 50 km (31 mi) | SE | earthquakes near Tehama County |
| Shasta County, CA | 59 km (37 mi) | NE | earthquakes near Shasta County |
| Glenn County, CA | 98 km (61 mi) | SSE | earthquakes near Glenn County |
| Humboldt County, CA | 113 km (70 mi) | WNW | earthquakes near Humboldt County |
| Butte County, CA | 124 km (77 mi) | SE | earthquakes near Butte 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.
- 1.8 2 km NE of Shasta, CA
- 2.1 40 km NW of Rancho Tehama Reserve, CA
- 2.2 16 km NE of Red Bluff, CA
- 1.9 9 km NE of Shasta Lake, CA
- 2.0 39 km NW of Rancho Tehama Reserve, CA
- 1.8 9 km NW of Shasta Lake, CA
- 1.9 10 km WNW of Shasta Lake, CA
- 2.2 43 km NW of Rancho Tehama Reserve, CA
- 2.0 14 km SSE of Hayfork, CA
- 1.6 8 km NNW of Bella Vista, CA
- 2.0 18 km NE of Red Bluff, CA
- 1.9 1 km ENE of Palo Cedro, CA
- 1.8 1 km E of Palo Cedro, CA
- 1.8 9 km NE of Shasta Lake, CA
- 2.4 4 km WNW of Shasta Lake, 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.