QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

31 km E of Tennant, CA

· 1.4 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Modoc County 69 kmSiskiyou County 82 kmShasta County 103 kmKlamath County 120 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
1.4 km below the surface
Felt
no reports yet
Nearest
Modoc County, 69 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 62 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 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 41.6102, -121.5462. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Modoc County, CA 69 km (43 mi) W of here earthquakes near Modoc County
Siskiyou County, CA 82 km (51 mi) E of here earthquakes near Siskiyou County
Shasta County, CA 103 km (64 mi) NNE of here earthquakes near Shasta County
Klamath County, OR 120 km (74 mi) S of here earthquakes near Klamath County
Lassen County, CA 126 km (78 mi) NW of here earthquakes near Lassen County
Jackson County, OR 129 km (80 mi) SE of here earthquakes near Jackson County

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

Aftershocks so far

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

  1. 2.0 13 km SSW of Tennant, CA
  2. 2.1 5 km SSW of Merrill, Oregon
  3. 1.6 25 km NW of McArthur, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.