QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

14km WNW of Lake Pillsbury, CA

· 3.5 km deep · released about 18 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 29 kmLake County 49 kmGlenn County 63 kmColusa County 81 kmSonoma County 104 kmTehama County 106 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
3.5 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Mendocino County, 29 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2666 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 18 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 840,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 600,000× the energy of this one
  3. Around the size people start to feel M 3.0 53× the energy of this one
  4. This earthquake M 1.9 about 18 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 39.4460, -123.1088. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 29 km (18 mi) E of here earthquakes near Mendocino County
Lake County, CA 49 km (30 mi) NW of here earthquakes near Lake County
Glenn County, CA 63 km (39 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 81 km (50 mi) WNW of here earthquakes near Colusa County
Sonoma County, CA 104 km (64 mi) N of here earthquakes near Sonoma County
Tehama County, CA 106 km (66 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

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

  1. 1.8 8km N of Lake Pillsbury, CA
  2. 1.9 1km SSW of Redwood Valley, CA
  3. 1.8 4km NE of Talmage, CA
  4. 1.6 1km ENE of Lake Pillsbury, CA
  5. 1.7 6km SW of Upper Lake, CA
  6. 2.4 8km N of Lake Pillsbury, CA
  7. 1.6 9km SSE of Lake Pillsbury, CA
  8. 1.6 16km NE of Willits, CA
  9. 1.5 5km S of Talmage, CA
  10. 1.6 12km WNW of Lake Pillsbury, CA
  11. 2.1 12km N of Alder Springs, CA
  12. 1.5 6km ESE of Willits, CA
  13. 1.7 13km SE of Laytonville, CA
  14. 1.6 4km SE of Willits, CA
  15. 1.6 8km ESE of Redwood Valley, 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 72,000 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.