QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

20km SSW of Willits, CA

· 5.7 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 21 kmLake County 62 kmSonoma County 92 kmGlenn County 98 kmColusa County 104 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
5.7 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 21 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2028 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 5.9 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 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 39.2457, -123.4463. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 21 km (13 mi) S of here earthquakes near Mendocino County
Lake County, CA 62 km (39 mi) WNW of here earthquakes near Lake County
Sonoma County, CA 92 km (57 mi) NNW of here earthquakes near Sonoma County
Glenn County, CA 98 km (61 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 104 km (65 mi) W of here earthquakes near Colusa County
Napa County, CA 127 km (79 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

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

  1. 1.7 8km NNW of Redwood Valley, CA
  2. 1.7 19km SW of Laytonville, CA
  3. 1.9 15km N of Brooktrails, CA
  4. 2.9 4km SSE of Redwood Valley, CA
  5. 2.0 12km WNW of Redwood Valley, CA
  6. 1.8 10km NNW of Redwood Valley, CA
  7. 1.6 11km NNE of Boonville, CA
  8. 1.5 18km NNW of Cloverdale, CA
  9. 2.6 10km NNW of Redwood Valley, CA
  10. 1.7 8km SE of Talmage, CA
  11. 1.7 17km SSE of Talmage, CA
  12. 2.0 5km WSW of Laytonville, CA
  13. 1.6 8km SSE of Laytonville, CA
  14. 1.7 9km NNW of Redwood Valley, CA
  15. 1.6 15km SE of Laytonville, 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 4.4 on 2020-12-06 — it released about 19,000 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.