QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1mw

13 km WSW of Laytonville, California

· -0.7 km deep · released about 19 tons of TNT

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10 km30 km60 km120 km N Mendocino County 30 kmLake County 98 kmGlenn County 106 kmTrinity County 119 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 4.1 (mw)
Depth
-0.7 km below the surface
Felt
88 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Mendocino County, 30 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3480 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 88 people have reported feeling it to USGS.

How big was it?

This earthquake released about 19 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 9,100× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 410× the energy of this one
  3. Magna, Utah 2020 M 5.7 290× the energy of this one
  4. This earthquake M 4.1 about 19 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 39× more

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 39.6598, -123.6373. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 30 km (19 mi) NNW of here earthquakes near Mendocino County
Lake County, CA 98 km (61 mi) NW of here earthquakes near Lake County
Glenn County, CA 106 km (66 mi) W of here earthquakes near Glenn County
Trinity County, CA 119 km (74 mi) SSW of here earthquakes near Trinity County
Humboldt County, CA 119 km (74 mi) SSE of here earthquakes near Humboldt County
Colusa County, CA 132 km (82 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

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

  1. 1.7 12 km N of Brooktrails, California
  2. 2.0 6 km ENE of Brooktrails, California
  3. 1.8 21 km ENE of Leggett, California
  4. 2.1 7 km ESE of Willits, California
  5. 1.8 8 km WSW of Covelo, California
  6. 1.5 5 km NNW of Laytonville, California
  7. 1.8 10 km WSW of Covelo, California
  8. 1.7 26 km SE of Alderpoint, California
  9. 1.7 26 km SE of Alderpoint, California
  10. 2.1 26 km SE of Alderpoint, California
  11. 1.8 26 km NNW of Covelo, California
  12. 2.2 26 km SE of Alderpoint, California
  13. 2.3 13 km SSE of Laytonville, California
  14. 1.7 9 km N of Redwood Valley, California
  15. 2.0 12 km NNE of Laytonville, California

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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.