QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

31km SE of Twentynine Palms, CA

· 8.2 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 28 kmSan Bernardino County 106 kmImperial County 110 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
8.2 km below the surface
Felt
no reports yet
Nearest
Riverside County, 28 km SSW
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 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 33.9432, -115.8372. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 28 km (18 mi) NNE of here earthquakes near Riverside County
San Bernardino County, CA 106 km (66 mi) SSE of here earthquakes near San Bernardino County
Imperial County, CA 110 km (68 mi) NNW of here earthquakes near Imperial County
San Diego County, CA 134 km (83 mi) NE of here earthquakes near San Diego 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. 2.2 20km NW of Desert Center, CA
  2. 3.1 16km NNE of Thousand Palms, CA
  3. 2.0 16km S of Joshua Tree, CA
  4. 2.0 9km NE of Indio, CA
  5. 1.6 26km NE of Indio, CA
  6. 2.6 6km NE of North Shore, CA
  7. 2.5 6km NE of North Shore, CA
  8. 1.5 8km N of North Shore, CA
  9. 1.5 12km NE of Coachella, CA
  10. 1.7 15km ENE of Indio, CA
  11. 2.1 15km NE of Coachella, CA
  12. 2.3 12km NE of Coachella, CA
  13. 1.6 12km NE of Coachella, CA
  14. 2.0 12km NE of Coachella, CA
  15. 1.6 8km NNE of Indio, 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.