QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

20 km NE of Upper Lake, California

· 11 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 23 kmGlenn County 45 kmColusa County 49 kmMendocino County 59 kmSonoma County 89 kmSutter County 97 kmNapa County 98 kmTehama County 101 kmYolo 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 1.7 (md)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Lake County, 23 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3516 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 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× 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 39.3177, -122.7752. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 23 km (15 mi) N of here earthquakes near Lake County
Glenn County, CA 45 km (28 mi) SW of here earthquakes near Glenn County
Colusa County, CA 49 km (30 mi) WNW of here earthquakes near Colusa County
Mendocino County, CA 59 km (37 mi) ESE of here earthquakes near Mendocino County
Sonoma County, CA 89 km (55 mi) N of here earthquakes near Sonoma County
Sutter County, CA 97 km (61 mi) WNW of here earthquakes near Sutter County

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

Aftershocks so far

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

  1. 1.6 17 km NNE of Upper Lake, California
  2. 2.1 19 km NNE of Upper Lake, California
  3. 2.0 Northern California
  4. 1.5 9 km S of Kelseyville, California
  5. 1.6 4 km ENE of Hopland, California
  6. 2.2 20 km NNE of Upper Lake, California
  7. 1.6 20 km NNE of Upper Lake, California
  8. 2.0 3 km ESE of Hopland, California
  9. 2.4 7 km NNE of Hopland, California
  10. 2.4 7 km NNE of Hopland, California
  11. 2.1 19 km NNE of Upper Lake, California
  12. 1.7 21 km NNE of Upper Lake, California
  13. 3.1 20 km NNE of Upper Lake, California
  14. 1.9 7 km NNE of Hopland, California
  15. 1.7 3 km ESE of Lower Lake, 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 5.1 on 2016-08-10 — it released about 120,000 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.