QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

14km NE of Glendora, CA

· 2.5 km deep · released about 5.9 lb of TNT

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10 km30 km60 km120 km N Los Angeles County 46 kmOrange County 62 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 1.5 (ml)
Depth
2.5 km below the surface
Felt
no reports yet
Nearest
Los Angeles County, 46 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1428 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 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 34.2337, -117.7607. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 46 km (29 mi) E of here earthquakes near Los Angeles County
Orange County, CA 62 km (39 mi) N of here earthquakes near Orange County

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

Aftershocks so far

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

  1. 1.6 3km NNW of Fontana, CA
  2. 1.8 5km SW of Devore, CA
  3. 2.1 7km SW of Pearblossom, CA
  4. 1.6 7km S of Pearblossom, CA
  5. 2.0 4km SE of Home Gardens, CA
  6. 1.6 3km SW of Yorba Linda, CA
  7. 1.9 7km SW of Pearblossom, CA
  8. 1.5 7km SW of Pearblossom, CA
  9. 1.6 2km ENE of La Habra, CA
  10. 1.8 6km NNW of Mira Loma, CA
  11. 1.7 4km NW of Diamond Bar, CA
  12. 1.6 5km SE of Home Gardens, CA
  13. 2.0 6km N of Fontana, CA
  14. 1.9 10km WSW of Corona, CA
  15. 1.5 4km NNW of Diamond Bar, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.5 on 2020-09-19 — it released about 33,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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