Earthquake · reviewed by a seismologist
M 1.6md
Earthquake near Ukiah, CA
Yes: an earthquake was likely felt in Ukiah in the last 24 hours. M 1.5, 10 km (6 mi) NE of Ukiah, at 12:31 pm PST on 11 November 2026 (20:31 UTC); the estimated shaking in Ukiah was intensity II (weak). Every earthquake near Ukiah
This page: a magnitude 1.6 earthquake was recorded 45 km (28 mi) southwest of Ukiah, CA, at 9:59 pm PDT on 8 October 2017 (04:59 UTC), 4.7 km deep.
USGS: 5 km E of Point Arena, California
96 km (59 mi) WNW of Santa Rosa, CA
- When
- 9:59 pm PDT on 8 October 2017 ()
- Where
- 45 km (28 mi) southwest of Ukiah, CA · earthquakes near Ukiah
- Magnitude
- M 1.6 (md)
- Depth
- 4.7 km below the surface
- Felt
- no reports yet
- Nearest
- Mendocino County, 60 km NNE
- Nearest mapped fault
- San Andreas 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 3311 days ago
Earthquake alerts for Ukiah, CA
Get a notification in this browser when USGS records an earthquake near Ukiah, 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 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 11 km (7 mi) from the epicentre. In Ukiah, 45 km away, the estimate is intensity I (not felt). 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: Boonville, Sea Ranch.
How big was it?
This earthquake released about 9 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 1,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
- Around the size people start to feel M 3.0 110× the energy of this one
- This earthquake M 1.6 about 9 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 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 38.9097, -123.6323. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Mendocino County, CA | 60 km (38 mi) | NNE | earthquakes near Mendocino County |
| Sonoma County, CA | 75 km (46 mi) | SE | earthquakes near Sonoma County |
| Lake County, CA | 80 km (50 mi) | ENE | earthquakes near Lake County |
| Napa County, CA | 122 km (76 mi) | ESE | earthquakes near Napa County |
| Marin County, CA | 123 km (76 mi) | SE | earthquakes near Marin County |
| Glenn County, CA | 131 km (81 mi) | NE | earthquakes near Glenn County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
40 earthquakes have been recorded within 50 km since this one.
- 2.0 15km SE of Boonville, CA
- 1.6 13km NW of Sea Ranch, CA
- 1.7 20km WSW of Cloverdale, CA
- 1.5 14km SSE of Talmage, CA
- 2.2 4km SW of Talmage, CA
- 2.0 12km NW of Boonville, CA
- 2.2 20km WNW of Boonville, CA
- 1.8 7km W of Redwood Valley, CA
- 1.8 18km ESE of Boonville, CA
- 1.7 19km NNW of Cloverdale, CA
- 1.6 15km SE of Boonville, CA
- 2.4 16km SE of Boonville, CA
- 2.4 16km SE of Boonville, CA
- 1.8 5km E of Boonville, CA
- 1.7 15km SE of Boonville, 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.