QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

7km E of Lake Pillsbury, CA

· 7.7 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 35 kmGlenn County 46 kmMendocino County 49 kmColusa County 61 kmTehama County 97 kmSonoma County 98 kmSutter County 109 kmNapa County 111 kmButte County 113 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
7.7 km below the surface
Felt
no reports yet
Nearest
Lake County, 35 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1595 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 39.4070, -122.8788. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 35 km (22 mi) NNW of here earthquakes near Lake County
Glenn County, CA 46 km (29 mi) WSW of here earthquakes near Glenn County
Mendocino County, CA 49 km (30 mi) E of here earthquakes near Mendocino County
Colusa County, CA 61 km (38 mi) WNW of here earthquakes near Colusa County
Tehama County, CA 97 km (60 mi) SW of here earthquakes near Tehama County
Sonoma County, CA 98 km (61 mi) N of here earthquakes near Sonoma County

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

Aftershocks so far

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

  1. 2.4 3km E of Willits, CA
  2. 1.7 5km ENE of Willits, CA
  3. 2.3 13km WNW of Redwood Valley, CA
  4. 2.3 13km W of Lake Pillsbury, CA
  5. 1.9 12km W of Lake Pillsbury, CA
  6. 1.8 6km ESE of Lake Pillsbury, CA
  7. 1.8 14km N of Brooktrails, CA
  8. 2.0 8km NNE of Lake Pillsbury, CA
  9. 1.6 16km NW of Lake Pillsbury, CA
  10. 1.5 10km ESE of Willits, CA
  11. 1.6 12km W of Lake Pillsbury, CA
  12. 2.8 14km W of Lakeport, CA
  13. 1.5 7km NNW of Ukiah, CA
  14. 1.6 12km NNE of Brooktrails, CA
  15. 1.8 5km N of Lake Pillsbury, 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.