QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

22km N of Lake Pillsbury, CA

· 15 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 42 kmGlenn County 52 kmLake County 60 kmColusa County 81 kmTehama County 88 kmTrinity 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 1.9 (md)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 42 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1543 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 25 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 420,000× the energy of this one
  3. Around the size people start to feel M 3.0 38× the energy of this one
  4. This earthquake M 1.9 about 25 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 39.6065, -123.0053. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 42 km (26 mi) ENE of here earthquakes near Mendocino County
Glenn County, CA 52 km (32 mi) W of here earthquakes near Glenn County
Lake County, CA 60 km (37 mi) NNW of here earthquakes near Lake County
Colusa County, CA 81 km (51 mi) NW of here earthquakes near Colusa County
Tehama County, CA 88 km (54 mi) SW of here earthquakes near Tehama County
Trinity County, CA 116 km (72 mi) S of here earthquakes near Trinity County

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

Aftershocks so far

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

  1. 1.5 8km NE of Brooktrails, CA
  2. 1.7 12km W of Lake Pillsbury, CA
  3. 1.8 8km NE of Brooktrails, CA
  4. 2.5 5km E of Covelo, CA
  5. 1.6 5km E of Covelo, CA
  6. 1.8 5km ENE of Covelo, CA
  7. 1.9 12km NW of Upper Lake, CA
  8. 1.6 4km NW of Laytonville, CA
  9. 2.8 5km E of Covelo, CA
  10. 1.7 7km E of Lake Pillsbury, CA
  11. 2.1 5km E of Covelo, CA
  12. 1.9 5km E of Covelo, CA
  13. 2.1 5km E of Covelo, CA
  14. 2.1 6km E of Covelo, CA
  15. 1.9 6km E of Covelo, 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 51,000 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.