QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near Chino Hills, CA

No earthquake was likely felt in Chino Hills in the 24 hours to 11:45 pm PST (07:45 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 1.7 earthquake was recorded in Chino Hills, CA, at 5:35 am PDT on 30 July 2016 (12:35 UTC), 11 km deep.

USGS: 2km S of Chino Hills, CA

in Chino Hills, CA · 61 km (38 mi) E of Los Angeles, CA

5:35 am PDT, Jul 30, 2016 · · 11 km deep · released about 11 lb of TNT

Every earthquake near Chino Hills Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 34 kmLos Angeles County 53 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
5:35 am PDT on 30 July 2016 ()
Where
in Chino Hills, CA · earthquakes near Chino Hills
Magnitude
M 1.7 (ml)
Depth
11 km below the surface
Felt
no reports yet
Nearest
Orange County, 34 km S
Nearest mapped fault
Elsinore fault, 8 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 3755 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 5 km (3 mi) from the epicentre. 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 in town, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 11 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 1,400,000× 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 89× the energy of this one
  4. This earthquake M 1.7 about 11 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

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 · 45 km SSW of this epicentre
  2. 6.2 3 km SE of San Bernardino, California · 47 km ENE of this epicentre
  3. 6.0 The 1910 Lake Elsinore, California Earthquake · 45 km SE of this epicentre
  4. 5.9 The 1987 Whittier Narrows, California Earthquake · 31 km WNW of this epicentre
  5. 5.8 The 1991 Sierra Madre, California Earthquake · 39 km NW 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 33.9780, -117.7558. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 34 km (21 mi) S earthquakes near Orange County
Los Angeles County, CA 53 km (33 mi) WNW earthquakes near Los Angeles County
San Diego County, CA 140 km (87 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

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

  1. 1.6 2km N of Bradbury, CA
  2. 1.9 1km ENE of Brea, CA
  3. 1.5 2km WNW of Huntington Park, CA
  4. 1.9 3km NNW of Baldwin Park, CA
  5. 1.5 7km S of Loma Linda, CA
  6. 3.7 5km S of Loma Linda, CA
  7. 1.6 7km SSE of Home Gardens, CA
  8. 1.7 10km NE of Trabuco Canyon, CA
  9. 2.1 2km NW of Seal Beach, CA
  10. 2.9 3km NW of Seal Beach, CA
  11. 1.6 5km SE of Home Gardens, CA
  12. 1.7 10km ESE of Yorba Linda, CA
  13. 1.8 7km NW of Glen Avon, CA
  14. 1.6 3km ESE of Monterey Park, CA
  15. 2.0 2km NNE of Costa Mesa, 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.