QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

18 km E of Hornbrook, California

· 24 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Siskiyou County 41 kmJackson County 62 kmKlamath County 102 kmJosephine 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 1.8 (ml)
Depth
24 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Siskiyou County, 41 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 825 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 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× 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 41.9215, -122.3288. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Siskiyou County, CA 41 km (25 mi) NNE of here earthquakes near Siskiyou County
Jackson County, OR 62 km (38 mi) SSE of here earthquakes near Jackson County
Klamath County, OR 102 km (63 mi) SSW of here earthquakes near Klamath County
Josephine County, OR 115 km (71 mi) ESE of here earthquakes near Josephine County

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

Aftershocks so far

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

  1. 1.0 18 km WNW of Klamath Falls, Oregon
  2. 2.0 26 km ENE of Hornbrook, CA
  3. 2.0 19 km SSW of Ashland, Oregon
  4. 2.6 23 km WSW of Mount Hebron, CA
  5. 1.6 23 km WSW of Klamath Falls, Oregon
  6. 2.5 6 km NW of Macdoel, CA
  7. 1.6 10 km WSW of Klamath Falls, Oregon
  8. 1.5 22 km E of Ashland, Oregon
  9. 1.9 17 km SW of Ashland, Oregon
  10. 1.6 7 km WSW of Klamath Falls, Oregon
  11. 1.9 24 km E of Hornbrook, CA
  12. 1.6 20 km E of Hornbrook, 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.

On USGS

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