QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

16km E of Mendocino, CA

· 7.7 km deep · released about 6.2 lb of TNT

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10 km30 km60 km120 km N Mendocino County 19 kmLake County 79 kmSonoma County 108 kmGlenn County 109 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
7.7 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 19 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1735 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 6.2 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 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.5 about 6.2 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 39.3343, -123.6173. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 19 km (12 mi) SW of here earthquakes near Mendocino County
Lake County, CA 79 km (49 mi) WNW of here earthquakes near Lake County
Sonoma County, CA 108 km (67 mi) NNW of here earthquakes near Sonoma County
Glenn County, CA 109 km (67 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 120 km (75 mi) W of here earthquakes near Colusa County
Napa County, CA 145 km (90 mi) NW of here earthquakes near Napa County

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

Aftershocks so far

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

  1. 1.7 9km SSE of Willits, CA
  2. 1.5 7km SW of Willits, CA
  3. 1.8 21km NNW of Boonville, CA
  4. 1.8 20km SSW of Willits, CA
  5. 1.6 11km N of Brooktrails, CA
  6. 1.8 20km SSW of Willits, CA
  7. 1.5 8km NE of Boonville, CA
  8. 1.7 10km SSE of Laytonville, CA
  9. 1.6 11km NNE of Brooktrails, CA
  10. 2.0 14km WSW of Willits, CA
  11. 1.8 18km SW of Willits, CA
  12. 1.9 18km SW of Willits, CA
  13. 1.6 8km E of Willits, CA
  14. 1.9 14km N of Brooktrails, CA
  15. 1.6 11km W of Lake Pillsbury, 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 15,000 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.