QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

16km NNW of Laytonville, CA

· 9.7 km deep · released about 5.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 44 kmTrinity County 100 kmGlenn County 102 kmHumboldt County 103 kmLake County 105 kmTehama County 118 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 1.5 (md)
Depth
9.7 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 44 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1422 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 5.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.6 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 39.8195, -123.5582. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 44 km (27 mi) NNW of here earthquakes near Mendocino County
Trinity County, CA 100 km (62 mi) SSW of here earthquakes near Trinity County
Glenn County, CA 102 km (63 mi) WNW of here earthquakes near Glenn County
Humboldt County, CA 103 km (64 mi) SSE of here earthquakes near Humboldt County
Lake County, CA 105 km (66 mi) NW of here earthquakes near Lake County
Tehama County, CA 118 km (73 mi) WSW of here earthquakes near Tehama County

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

Aftershocks so far

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

  1. 1.7 11km N of Brooktrails, CA
  2. 2.4 2km ENE of Willits, CA
  3. 2.5 15km W of Brooktrails, CA
  4. 2.4 2km ENE of Willits, CA
  5. 2.0 13km NNE of Fort Bragg, CA
  6. 1.6 7km ENE of Willits, CA
  7. 1.9 13km N of Brooktrails, CA
  8. 1.9 5km NNW of Laytonville, CA
  9. 1.7 5km WSW of Laytonville, CA
  10. 2.6 18km W of Cape Vizcaino, CA
  11. 2.5 18km W of Cape Vizcaino, CA
  12. 2.3 8km NNE of Laytonville, CA
  13. 1.8 22km NNW of Lake Pillsbury, CA
  14. 2.3 4km WNW of Redway, CA
  15. 1.8 24km SE 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 4.3 on 2017-12-14 — it released about 13,000 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.