QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

27km ENE of Porterville, CA

· 11 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Tulare County 9 kmKern County 90 kmKings County 97 kmFresno County 106 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
11 km below the surface
Felt
no reports yet
Nearest
Tulare County, 9 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3387 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 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 36.1525, -118.7357. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Tulare County, CA 9 km (6 mi) SSE of here earthquakes near Tulare County
Kern County, CA 90 km (56 mi) N of here earthquakes near Kern County
Kings County, CA 97 km (61 mi) E of here earthquakes near Kings County
Fresno County, CA 106 km (66 mi) SE of here earthquakes near Fresno County
Inyo County, CA 128 km (79 mi) WSW of here earthquakes near Inyo County
Madera County, CA 148 km (92 mi) SE of here earthquakes near Madera County

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

Aftershocks so far

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

  1. 1.5 18km W of Olancha, CA
  2. 1.8 18km WSW of Olancha, CA
  3. 1.7 19km W of Olancha, CA
  4. 1.5 8km NNW of Kernville, CA
  5. 1.7 13km SE of Woodlake, CA
  6. 1.7 32km NNE of Kernville, CA
  7. 1.5 27km W of Olancha, CA
  8. 1.8 30km W of Olancha, CA
  9. 1.6 16km NNE of Kernville, CA
  10. 1.9 8km NNW of Kernville, CA
  11. 2.1 6km W of Kernville, CA
  12. 1.5 20 km W of Cartago, California
  13. 1.6 16km NNE of Kernville, CA
  14. 1.6 27km W of Olancha, CA
  15. 2.2 26km W of Olancha, 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.