Earthquake · automatic estimate, may change
M 2.4md
Earthquake near Redwood Valley, CA
No earthquake was likely felt in Redwood Valley in the 24 hours to 2:57 pm PDT (21:57 UTC). The last one was M 2.4, 6 km (4 mi) N, at 3:48 am PDT on 20 October 2026, estimated intensity III (weak) in town. Every earthquake near Redwood Valley
This page: a magnitude 2.4 earthquake was recorded 6 km (4 mi) north of Redwood Valley, CA, at 3:48 am PDT on 20 October 2026 (10:48 UTC), 2.0 km deep. The magnitude and location are an automatic first estimate and may change.
USGS: 6 km N of Redwood Valley, CA
- When
- 3:48 am PDT on 20 October 2026 ()
- Where
- 6 km (4 mi) north of Redwood Valley, CA · earthquakes near Redwood Valley
- Magnitude
- M 2.4 (md)
- Depth
- 2.0 km below the surface
- Felt
- no reports yet
- Nearest
- Mendocino County, 23 km WNW
- Nearest mapped fault
- Maacama fault, 5 km from its surface trace — near is not the same as on
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 35 hours ago
Earthquake alerts for Redwood Valley, 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, people at rest would likely notice it out to about 20 km (12 mi) from the epicentre. In Redwood Valley, 6 km away, the estimate is intensity III (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: Redwood Valley 6 km, intensity III · Willits 15 km, intensity II · Ukiah 19 km, intensity II · Brooktrails 20 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 150,000× the energy of this one
- Magna, Utah 2020 M 5.7 110,000× the energy of this one
- Around the size people start to feel M 3.0 9.4× the energy of this one
- This earthquake M 2.4 about 100 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 5.6 on 2026-06-24 — about 72,000 times the energy of this one.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.2 6 km ESE of Talmage, California · 25 km SSE 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 39.3223, -123.2157. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Mendocino County, CA | 23 km (14 mi) | WNW | earthquakes near Mendocino County |
| Lake County, CA | 47 km (29 mi) | ESE | earthquakes near Lake County |
| Glenn County, CA | 77 km (48 mi) | ENE | earthquakes near Glenn County |
| Colusa County, CA | 86 km (53 mi) | E | earthquakes near Colusa County |
| Sonoma County, CA | 92 km (57 mi) | SSE | earthquakes near Sonoma County |
| Napa County, CA | 119 km (74 mi) | SE | earthquakes near Napa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
1 earthquake has been recorded within 50 km since this one.
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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| reported intensity | not reported | 1 | |
| felt reports | not reported | 0 |
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.