QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

8km WSW of Upper Lake, CA

· 8.6 km deep · released about 9.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 22 kmMendocino County 51 kmColusa County 66 kmSonoma County 67 kmGlenn County 74 kmNapa County 90 kmYolo County 107 kmSutter 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 1.7 (md)
Depth
8.6 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Lake County, 22 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2090 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 9.6 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 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 99× the energy of this one
  4. This earthquake M 1.7 about 9.6 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 39.1272, -122.9963. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 22 km (14 mi) W of here earthquakes near Lake County
Mendocino County, CA 51 km (32 mi) SE of here earthquakes near Mendocino County
Colusa County, CA 66 km (41 mi) W of here earthquakes near Colusa County
Sonoma County, CA 67 km (42 mi) N of here earthquakes near Sonoma County
Glenn County, CA 74 km (46 mi) SW of here earthquakes near Glenn County
Napa County, CA 90 km (56 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. 1.5 8km SSW of Kelseyville, CA
  2. 2.1 8km SSW of Kelseyville, CA
  3. 1.9 8km SSW of Kelseyville, CA
  4. 3.0 8km SSW of Kelseyville, CA
  5. 1.5 5km WNW of Cobb, CA
  6. 1.5 8km SSW of Kelseyville, CA
  7. 1.8 8km NW of The Geysers, CA
  8. 1.8 7km NW of The Geysers, CA
  9. 2.8 7km NW of The Geysers, CA
  10. 1.9 7km WNW of The Geysers, CA
  11. 1.7 10km WNW of The Geysers, CA
  12. 2.2 10km NNW of Redwood Valley, CA
  13. 1.6 8km NW of The Geysers, CA
  14. 2.0 3km NW of Lower Lake, CA
  15. 2.1 2km N of The Geysers, 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 130,000 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.