QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

7km ESE of Willits, CA

· -0.1 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 15 kmLake County 55 kmGlenn County 79 kmColusa County 92 kmSonoma County 101 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
-0.1 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Mendocino County, 15 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1363 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 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 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 39.3900, -123.2755. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 15 km (9 mi) ESE of here earthquakes near Mendocino County
Lake County, CA 55 km (34 mi) NW of here earthquakes near Lake County
Glenn County, CA 79 km (49 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 92 km (57 mi) WNW of here earthquakes near Colusa County
Sonoma County, CA 101 km (63 mi) NNW of here earthquakes near Sonoma County
Tehama County, CA 121 km (75 mi) SW of here earthquakes near Tehama County

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

Aftershocks so far

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

  1. 2.4 2km ENE of Willits, CA
  2. 1.7 6km SE of Lake Pillsbury, CA
  3. 1.7 6km SE of Lake Pillsbury, CA
  4. 1.7 14km N of Upper Lake, CA
  5. 2.3 6km SE of Lake Pillsbury, CA
  6. 1.9 4km NW of Navarro Head, CA
  7. 1.8 13km WNW of Lake Pillsbury, CA
  8. 1.6 11km SSE of Lake Pillsbury, CA
  9. 2.0 13km NNE of Fort Bragg, CA
  10. 1.7 6km SE of Lake Pillsbury, CA
  11. 1.6 7km ENE of Willits, CA
  12. 2.1 8km W of Redwood Valley, CA
  13. 1.9 13km N of Brooktrails, CA
  14. 1.8 6km NNE of Ukiah, CA
  15. 1.9 5km NNW 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 5.1 on 2016-08-10 — it released about 240,000 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.