QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

18 km N of Stony Gorge Reservoir, CA

· 19 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 20 kmTehama County 51 kmColusa County 68 kmLake County 72 kmButte County 82 kmMendocino County 84 kmSutter County 107 kmTrinity County 111 kmYuba County 116 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
19 km below the surface
Felt
no reports yet
Nearest
Glenn County, 20 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 412 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 39.7428, -122.5552. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 20 km (13 mi) NW of here earthquakes near Glenn County
Tehama County, CA 51 km (32 mi) SSW of here earthquakes near Tehama County
Colusa County, CA 68 km (43 mi) NNW of here earthquakes near Colusa County
Lake County, CA 72 km (45 mi) NNE of here earthquakes near Lake County
Butte County, CA 82 km (51 mi) W of here earthquakes near Butte County
Mendocino County, CA 84 km (52 mi) ENE of here earthquakes near Mendocino County

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

Aftershocks so far

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

  1. 2.0 7 km N of Lake Pillsbury, CA
  2. 1.8 7 km N of Lake Pillsbury, CA
  3. 1.6 7 km N of Lake Pillsbury, CA
  4. 2.0 5 km S of Alder Springs, CA
  5. 2.0 13 km W of Alder Springs, CA
  6. 1.8 28 km ENE of Covelo, CA
  7. 2.0 20 km NW of Alder Springs, CA
  8. 3.2 20 km NNW of Alder Springs, CA
  9. 1.7 16 km ESE of Lake Pillsbury, CA
  10. 2.3 17 km ESE of Lake Pillsbury, CA
  11. 1.7 21 km WNW of Alder Springs, CA
  12. 1.7 21 km WNW of Alder Springs, CA
  13. 2.3 21 km WNW of Alder Springs, CA
  14. 1.6 13 km NNW of Lake Pillsbury, CA
  15. 1.5 6 km ESE 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 4.2 on 2025-03-17 — it released about 4,600 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.