QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

1km E of Alhambra, CA

· 9.2 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 18 kmOrange County 56 kmVentura County 98 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 1.7 (ml)
Depth
9.2 km below the surface
Felt
no reports yet
Nearest
Los Angeles County, 18 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3386 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 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× the energy of this one
  4. This earthquake M 1.7 about 10 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 34.0938, -118.1167. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 18 km (11 mi) SE of here earthquakes near Los Angeles County
Orange County, CA 56 km (35 mi) NW of here earthquakes near Orange County
Ventura County, CA 98 km (61 mi) ESE of here earthquakes near Ventura County

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

Aftershocks so far

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

  1. 1.6 4km N of Gardena, CA
  2. 1.8 3km WSW of East Los Angeles, CA
  3. 1.7 5km NE of Yorba Linda, CA
  4. 2.4 4km SSW of Yorba Linda, CA
  5. 1.6 7km WSW of Huntington Beach, CA
  6. 2.1 4km SSW of Yorba Linda, CA
  7. 1.6 4km ESE of Placentia, CA
  8. 1.6 4km SSW of Yorba Linda, CA
  9. 2.4 4km SSW of Yorba Linda, CA
  10. 1.7 2km NE of La Canada Flintridge, CA
  11. 1.5 1km NNW of Florence-Graham, CA
  12. 2.3 6km ENE of Glendora, CA
  13. 1.9 3km SE of Chatsworth, CA
  14. 2.0 8km N of La Verne, CA
  15. 2.5 8km SSE of San Pedro, 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.