QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

7km NE of Willits, CA

· 6.3 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 12 kmLake County 62 kmGlenn County 79 kmColusa County 97 kmSonoma County 109 kmTehama County 118 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
Magnitude
M 1.7 (md)
Depth
6.3 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 12 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1662 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 12 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 870,000× the energy of this one
  3. Around the size people start to feel M 3.0 78× the energy of this one
  4. This earthquake M 1.7 about 12 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.

Where

Epicentre 39.4562, -123.3083. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 12 km (7 mi) ENE of here earthquakes near Mendocino County
Lake County, CA 62 km (39 mi) NW of here earthquakes near Lake County
Glenn County, CA 79 km (49 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 97 km (60 mi) WNW of here earthquakes near Colusa County
Sonoma County, CA 109 km (68 mi) NNW of here earthquakes near Sonoma County
Tehama County, CA 118 km (74 mi) SW of here earthquakes near Tehama County

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

Aftershocks so far

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

  1. 1.6 10km SE of Willits, CA
  2. 1.8 13km N of Fort Bragg, CA
  3. 1.6 18km SE of Lake Pillsbury, CA
  4. 1.7 10km SE of Willits, CA
  5. 1.5 10km SE of Willits, CA
  6. 2.1 18km NE of Upper Lake, CA
  7. 1.9 7km ENE of Covelo, CA
  8. 2.0 21km WNW of Ukiah, CA
  9. 1.7 10km SE of Willits, CA
  10. 1.8 9km NE of Laytonville, CA
  11. 2.2 6km ESE of Lake Pillsbury, CA
  12. 1.8 14km SE of Lake Pillsbury, CA
  13. 2.5 15km SE of Lake Pillsbury, CA
  14. 1.7 9km SSE of Willits, CA
  15. 1.5 7km SW 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.1 on 2016-08-10 — it released about 110,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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