Earthquake · reviewed by a seismologist
M 1.6md
Earthquake near Redwood Valley, CA
No earthquake was likely felt in Redwood Valley in the 24 hours to 7:09 am PST (15:09 UTC). The last one was M 1.5, 7 km (5 mi) SE, at 12:31 pm PST on 11 November 2026, estimated intensity II (weak) in town. Every earthquake near Redwood Valley
This page: a magnitude 1.6 earthquake was recorded in Redwood Valley, CA, at 12:29 pm PDT on 20 June 2023 (19:29 UTC), 7.4 km deep.
USGS: 2km SW of Redwood Valley, CA
- When
- 12:29 pm PDT on 20 June 2023 ()
- Where
- in Redwood Valley, CA · earthquakes near Redwood Valley
- Magnitude
- M 1.6 (md)
- Depth
- 7.4 km below the surface
- Felt
- no reports yet
- Nearest
- Mendocino County, 28 km NW
- Nearest mapped fault
- Maacama fault, 1 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 1241 days ago
Earthquake alerts for Redwood Valley, 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 8 km (5 mi) from the epicentre. 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: Ukiah, Talmage, Willits, Brooktrails, Upper Lake, Boonville.
How big was it?
This earthquake released about 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
- Around the size people start to feel M 3.0 130× the energy of this one
- This earthquake M 1.6 about 7.6 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 170,000 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 · 19 km SE 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 39.2537, -123.2208. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Mendocino County, CA | 28 km (17 mi) | NW | earthquakes near Mendocino County |
| Lake County, CA | 44 km (27 mi) | ESE | earthquakes near Lake County |
| Glenn County, CA | 80 km (50 mi) | ENE | earthquakes near Glenn County |
| Sonoma County, CA | 85 km (53 mi) | SSE | earthquakes near Sonoma County |
| Colusa County, CA | 85 km (53 mi) | E | earthquakes near Colusa County |
| Napa County, CA | 114 km (71 mi) | SE | earthquakes near Napa County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
25 earthquakes have been recorded within 50 km since this one.
- 1.6 10 km SE of Lake Pillsbury, CA
- 2.2 10 km N of Lake Pillsbury, CA
- 2.6 10 km N of Lake Pillsbury, CA
- 1.8 6 km ESE of Lake Pillsbury, CA
- 1.7 14 km N of Lake Pillsbury, CA
- 2.2 6 km SE of Lake Pillsbury, CA
- 1.6 9 km ESE of Willits, CA
- 1.7 14 km NNE of Redwood Valley, CA
- 2.1 11 km ESE of Talmage, CA
- 2.9 11km N of Brooktrails, CA
- 1.5 8km SE of Willits, CA
- 1.8 10km SE of Willits, CA
- 1.6 14km NE of Upper Lake, CA
- 2.0 15km NE of Point Arena, CA
- 1.6 8km E of Willits, 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.