QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

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 1.7 earthquake was recorded 17 km (10 mi) south-southeast of Ukiah, CA, at 4:51 pm PDT on 6 June 2017 (23:51 UTC), 4.3 km deep.

USGS: 5 km N of Hopland, California

73 km (45 mi) NNW of Santa Rosa, CA

4:51 pm PDT, Jun 6, 2017 · · 4.3 km deep · released about 10 lb of TNT

Every earthquake near Ukiah Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 33 kmMendocino County 54 kmSonoma County 57 kmColusa County 78 kmNapa County 89 kmGlenn County 89 kmYolo County 111 kmMarin County 112 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
4:51 pm PDT on 6 June 2017 ()
Where
17 km (10 mi) south-southeast of Ukiah, CA · earthquakes near Ukiah
Magnitude
M 1.7 (md)
Depth
4.3 km below the surface
Felt
no reports yet
Nearest
Lake County, 33 km ENE
Nearest mapped fault
Maacama fault, 2 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 3443 days ago

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, 17 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: Talmage, Lakeport, North Lakeport, Boonville, Upper Lake, Kelseyville.

How big was it?

This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 95× the energy of this one
  4. This earthquake M 1.7 about 10 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 130,000 times the energy of this one.

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.2 6 km ESE of Talmage, California · 11 km N 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 39.0190, -123.1123. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lake County, CA 33 km (21 mi) ENE earthquakes near Lake County
Mendocino County, CA 54 km (34 mi) NNW earthquakes near Mendocino County
Sonoma County, CA 57 km (36 mi) SSE earthquakes near Sonoma County
Colusa County, CA 78 km (48 mi) ENE earthquakes near Colusa County
Napa County, CA 89 km (55 mi) SE earthquakes near Napa County
Glenn County, CA 89 km (55 mi) NE earthquakes near Glenn County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

60 earthquakes have been recorded within 50 km since this one.

  1. 1.6 5 km W of Cobb, California
  2. 1.5 8 km W of Cobb, California
  3. 2.0 8 km W of Cobb, California
  4. 2.0 7 km S of Cobb, California
  5. 1.6 7 km W of Cobb, California
  6. 2.1 18 km N of Upper Lake, California
  7. 1.5 7 km WSW of Cobb, California
  8. 2.0 3 km SW of Cobb, California
  9. 1.7 5 km W of Cobb, California
  10. 1.6 18 km NNE of Upper Lake, California
  11. 2.0 16 km NE of Upper Lake, California
  12. 1.7 7 km S of Cobb, California
  13. 1.6 6 km W of Cobb, California
  14. 1.6 5 km S of Cobb, California
  15. 2.4 7 km W of Cobb, California

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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.