QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

Earthquake near Chino Hills, CA

No earthquake was likely felt in Chino Hills in the 24 hours to 5:05 am PST (13:05 UTC). The last one was M 3.2, 16 km (10 mi) E, at 5:37 am PDT on 2 September 2026, estimated intensity III (weak) in town; 730 felt reports to USGS. Every earthquake near Chino Hills

This page: a magnitude 1.8 earthquake was recorded 3 km (2 mi) southwest of Chino Hills, CA, at 6:23 am PDT on 11 June 2023 (13:23 UTC), 5.3 km deep.

USGS: 3km SW of Chino Hills, CA

in Diamond Bar, CA · 58 km (36 mi) E of Los Angeles, CA

6:23 am PDT, Jun 11, 2023 · · 5.3 km deep · released about 14 lb of TNT

Every earthquake near Chino Hills Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 33 kmLos Angeles County 50 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
6:23 am PDT on 11 June 2023 ()
Where
3 km (2 mi) southwest of Chino Hills, CA · earthquakes near Chino Hills
Magnitude
M 1.8 (ml)
Depth
5.3 km below the surface
Felt
no reports yet
Nearest
Orange County, 33 km S
Nearest mapped fault
Elsinore fault, 7 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1249 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 12 km (7 mi) from the epicentre. In Chino Hills, 3 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Chino Hills 3 km, intensity II · Diamond Bar 7 km, intensity II · Walnut 9 km, intensity II · Pomona 9 km, intensity II · Chino 10 km, intensity II · Yorba Linda 10 km, intensity II · Rowland Heights 11 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 14 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 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.5 on 2020-09-19 — about 14,000 times the energy of this one.

Before 2016, the USGS record lists 17 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.4 The 1933 Long Beach, California Earthquake · 43 km SSW of this epicentre
  2. 6.0 The 1910 Lake Elsinore, California Earthquake · 47 km SE of this epicentre
  3. 5.9 The 1987 Whittier Narrows, California Earthquake · 29 km WNW of this epicentre
  4. 5.8 The 1991 Sierra Madre, California Earthquake · 38 km NNW of this epicentre
  5. 5.5 The 1990 Upland, California Earthquake · 20 km NNE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 33.9743, -117.7840. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 33 km (21 mi) S earthquakes near Orange County
Los Angeles County, CA 50 km (31 mi) WNW earthquakes near Los Angeles County
San Diego County, CA 141 km (88 mi) SE earthquakes near San Diego County

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

Aftershocks so far

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

  1. 2.1 9 km WSW of Corona, CA
  2. 3.1 2 km NW of Fontana, CA
  3. 1.6 8 km SSE of Home Gardens, CA
  4. 1.6 4 km ESE of Home Gardens, CA
  5. 1.9 7 km N of Rancho Cucamonga, CA
  6. 1.6 2 km N of Loma Linda, CA
  7. 1.5 3 km WSW of Huntington Beach, CA
  8. 1.7 5 km SSE of Home Gardens, CA
  9. 1.6 2 km NNW of Fontana, CA
  10. 2.7 3 km E of Carson, CA
  11. 2.7 4 km ENE of Inglewood, CA
  12. 1.6 5 km SSE of Home Gardens, CA
  13. 2.4 1 km E of Loma Linda, CA
  14. 1.6 5 km NE of View Park-Windsor Hills, CA
  15. 2.5 6 km NNE of Fontana, 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.