QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

7km ENE of Laytonville, CA

· 10.0 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 31 kmGlenn County 87 kmLake County 88 kmTrinity County 107 kmTehama County 111 kmColusa County 117 kmHumboldt County 119 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 2.1 (md)
Depth
10.0 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 31 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1973 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 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 39.7097, -123.4098. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 31 km (19 mi) N of here earthquakes near Mendocino County
Glenn County, CA 87 km (54 mi) W of here earthquakes near Glenn County
Lake County, CA 88 km (55 mi) NW of here earthquakes near Lake County
Trinity County, CA 107 km (67 mi) SSW of here earthquakes near Trinity County
Tehama County, CA 111 km (69 mi) WSW of here earthquakes near Tehama County
Colusa County, CA 117 km (73 mi) WNW of here earthquakes near Colusa County

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

Aftershocks so far

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

  1. 1.6 12km N of Brooktrails, CA
  2. 1.6 9km SSE of Redway, CA
  3. 2.3 6km E of Willits, CA
  4. 1.6 6km S of Fort Bragg, CA
  5. 1.7 4km NW of Redwood Valley, CA
  6. 1.8 7km W of Laytonville, CA
  7. 2.4 11km W of Laytonville, CA
  8. 1.6 7km ENE of Brooktrails, CA
  9. 1.5 16km SSW of Willits, CA
  10. 1.5 8km ESE of Willits, CA
  11. 2.0 15km WNW of Lake Pillsbury, CA
  12. 1.5 8km SSE of Laytonville, CA
  13. 1.6 11km SE of Laytonville, CA
  14. 1.8 2km NNW of Lake Pillsbury, CA
  15. 1.6 9km NW 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 4.3 on 2019-04-29 — it released about 2,100 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.