QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

16km NE of Upper Lake, CA

· -0.7 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake County 17 kmColusa County 48 kmGlenn County 50 kmMendocino County 60 kmSonoma County 83 kmNapa County 93 kmSutter County 96 kmYolo County 100 kmTehama County 107 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 1.8 (md)
Depth
-0.7 km below the surface
Felt
no reports yet
Nearest
Lake County, 17 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1589 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 13 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× the energy of this one
  4. This earthquake M 1.8 about 13 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 39.2603, -122.7805. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake County, CA 17 km (11 mi) N of here earthquakes near Lake County
Colusa County, CA 48 km (30 mi) WNW of here earthquakes near Colusa County
Glenn County, CA 50 km (31 mi) SW of here earthquakes near Glenn County
Mendocino County, CA 60 km (37 mi) ESE of here earthquakes near Mendocino County
Sonoma County, CA 83 km (51 mi) N of here earthquakes near Sonoma County
Napa County, CA 93 km (58 mi) NNW 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. 1.7 6km ESE of Lake Pillsbury, CA
  2. 1.5 3km WNW of Cobb, CA
  3. 1.7 4km E of Willits, CA
  4. 1.8 6km ESE of Lake Pillsbury, CA
  5. 1.6 2km NW of Cobb, CA
  6. 1.6 3km NNW of Cobb, CA
  7. 1.7 3km NW of Cobb, CA
  8. 2.1 2km NW of Cobb, CA
  9. 4.2 2km WNW of Cobb, CA
  10. 1.6 15km NW of Lake Pillsbury, CA
  11. 1.6 5km ENE of Talmage, CA
  12. 1.5 8km NW of The Geysers, CA
  13. 1.6 6km NW of The Geysers, CA
  14. 1.7 6km NW of The Geysers, CA
  15. 1.8 10km SE of Willits, 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 99,000 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.