QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

6 km WSW of Hopland, California

· 3.5 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 42 kmSonoma County 51 kmMendocino County 59 kmColusa County 86 kmNapa County 88 kmGlenn County 100 kmMarin County 106 kmYolo County 115 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 1.7 (md)
Depth
3.5 km below the surface
Felt
no reports yet
Nearest
Lake County, 42 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3413 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 930,000× the energy of this one
  3. Around the size people start to feel M 3.0 83× the energy of this one
  4. This earthquake M 1.7 about 11 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 38.9387, -123.1825. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 42 km (26 mi) WSW of here earthquakes near Lake County
Sonoma County, CA 51 km (32 mi) NNW of here earthquakes near Sonoma County
Mendocino County, CA 59 km (37 mi) SSE of here earthquakes near Mendocino County
Colusa County, CA 86 km (53 mi) WSW of here earthquakes near Colusa County
Napa County, CA 88 km (55 mi) WNW of here earthquakes near Napa County
Glenn County, CA 100 km (62 mi) SW of here earthquakes near Glenn County

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

Aftershocks so far

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

  1. 2.1 8 km WSW of Cobb, California
  2. 1.7 8 km W of Cobb, California
  3. 1.9 8 km W of Cobb, California
  4. 1.8 6 km WSW of Cobb, California
  5. 1.9 6 km W of Cobb, California
  6. 2.0 3 km WSW of Cobb, California
  7. 1.6 7 km S of Cobb, California
  8. 1.7 6 km SSE of Cobb, California
  9. 1.8 10 km WNW of Cobb, California
  10. 1.9 8 km W of Cobb, California
  11. 1.7 7 km S of Cobb, California
  12. 1.9 8 km W of Cobb, California
  13. 1.7 8 km W of Cobb, California
  14. 1.8 5km WNW of The Geysers, CA
  15. 1.9 Northern 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.0 on 2016-12-14 — it released about 86,000 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.