Earthquake · reviewed by a seismologist
M 2.5md
Earthquake near Covelo, CA
No earthquake was likely felt in Covelo in the 24 hours to 3:24 pm PST (23:24 UTC). The last one was M 2.2, 9 km (6 mi) N, at 3:31 pm PST on 10 November 2026, estimated intensity II (weak) in town. Every earthquake near Covelo
This page: a magnitude 2.5 earthquake was recorded 37 km (23 mi) east-southeast of Covelo, CA, at 10:40 pm PDT on 26 July 2021 (05:40 UTC), 1.3 km deep.
USGS: 11km W of Alder Springs, CA
- When
- 10:40 pm PDT on 26 July 2021 ()
- Where
- 37 km (23 mi) east-southeast of Covelo, CA · earthquakes near Covelo
- Magnitude
- M 2.5 (md)
- Depth
- 1.3 km below the surface
- Felt
- no reports yet
- Nearest
- Glenn County, 39 km E
- Nearest mapped fault
- Bartlett Springs fault system, 10 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 1867 days ago
Earthquake alerts for Covelo, CA
Get a notification in this browser when USGS records an earthquake near Covelo, 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 Covelo, 37 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 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 86,000× the energy of this one
- Magna, Utah 2020 M 5.7 61,000× the energy of this one
- Around the size people start to feel M 3.0 5.4× the energy of this one
- This earthquake M 2.5 about 180 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
The largest earthquake within 50 km since 2016 was M 5.1 on 2016-08-10 — about 7,400 times the energy of this one.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
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 39.6675, -122.8478. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Glenn County, CA | 39 km (24 mi) | E | earthquakes near Glenn County |
| Mendocino County, CA | 57 km (36 mi) | WSW | earthquakes near Mendocino County |
| Lake County, CA | 63 km (39 mi) | S | earthquakes near Lake County |
| Tehama County, CA | 73 km (45 mi) | NE | earthquakes near Tehama County |
| Colusa County, CA | 76 km (47 mi) | SE | earthquakes near Colusa County |
| Butte County, CA | 107 km (66 mi) | E | earthquakes near Butte County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
59 earthquakes have been recorded within 50 km since this one.
- 1.9 12km WNW of Alder Springs, CA
- 2.9 12km W of Alder Springs, CA
- 1.8 13km W of Alder Springs, CA
- 2.8 13km WNW of Alder Springs, CA
- 1.6 10km NNW of Redwood Valley, CA
- 2.9 12km W of Alder Springs, CA
- 1.8 12km W of Alder Springs, CA
- 2.6 13km W of Alder Springs, CA
- 2.9 12km WNW of Alder Springs, CA
- 2.1 12km W of Alder Springs, CA
- 2.0 12km W of Alder Springs, CA
- 2.4 12km W of Alder Springs, CA
- 1.9 11km WNW of Alder Springs, CA
- 1.7 8km SSW of Covelo, CA
- 1.9 13km W of Alder Springs, 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.