QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

7km NW of Stony Gorge Reservoir, CA

· 10 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Glenn County 15 kmColusa County 58 kmLake County 60 kmTehama County 62 kmMendocino County 77 kmButte County 84 kmSutter County 100 kmYuba 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 1.8 (md)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Glenn County, 15 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1712 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 39.6320, -122.5785. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Glenn County, CA 15 km (10 mi) WNW of here earthquakes near Glenn County
Colusa County, CA 58 km (36 mi) NNW of here earthquakes near Colusa County
Lake County, CA 60 km (37 mi) NNE of here earthquakes near Lake County
Tehama County, CA 62 km (39 mi) SSW of here earthquakes near Tehama County
Mendocino County, CA 77 km (48 mi) ENE of here earthquakes near Mendocino County
Butte County, CA 84 km (52 mi) W of here earthquakes near Butte County

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

Aftershocks so far

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

  1. 1.9 2km ESE of Lake Pillsbury, CA
  2. 2.1 13km SSE of Willows, CA
  3. 1.9 6km ESE of Lake Pillsbury, CA
  4. 1.6 6km N of Lake Pillsbury, CA
  5. 1.8 12km WNW of Lake Pillsbury, CA
  6. 1.9 12km W of Lake Pillsbury, CA
  7. 1.8 6km ESE of Lake Pillsbury, CA
  8. 2.0 8km NNE of Lake Pillsbury, CA
  9. 1.6 16km NW of Lake Pillsbury, CA
  10. 1.6 12km W of Lake Pillsbury, CA
  11. 1.8 5km N of Lake Pillsbury, CA
  12. 2.3 10km NNW of Lake Pillsbury, CA
  13. 2.2 4km ESE of Lake Pillsbury, CA
  14. 2.1 5km ESE of Lake Pillsbury, CA
  15. 1.9 22km 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 86,000 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.