QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

3 km SSE of Philo, California

· -0.5 km deep · released about 6.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 44 kmLake County 59 kmSonoma County 71 kmColusa County 104 kmGlenn County 108 kmNapa County 112 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 1.6 (md)
Depth
-0.5 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 44 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3432 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 6.4 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 2,400,000× 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 1.6 about 6.4 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 39.0348, -123.4247. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 44 km (27 mi) S of here earthquakes near Mendocino County
Lake County, CA 59 km (37 mi) W of here earthquakes near Lake County
Sonoma County, CA 71 km (44 mi) NW of here earthquakes near Sonoma County
Colusa County, CA 104 km (64 mi) W of here earthquakes near Colusa County
Glenn County, CA 108 km (67 mi) SW of here earthquakes near Glenn County
Napa County, CA 112 km (70 mi) WNW of here earthquakes near Napa 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. 2.5 7 km NNE of Hopland, California
  2. 1.8 9 km W of Hopland, California
  3. 1.6 6 km W of Sea Ranch, California
  4. 3.9 3 km NW of Redwood Valley, California
  5. 1.6 5 km E of Point Arena, California
  6. 1.5 9 km NE of Willits, California
  7. 1.8 3 km WSW of Hopland, California
  8. 1.6 8 km E of Willits, California
  9. 2.0 6 km ENE of Calpella, California
  10. 1.7 9 km ESE of Willits, California
  11. 1.7 1 km N of Talmage, California
  12. 2.2 12 km WSW of Hopland, California
  13. 2.1 10 km ESE of Hopland, California
  14. 1.5 7 km ESE of Hopland, California
  15. 1.7 10 km ENE of Talmage, 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.