QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

Earthquake near Eastvale, CA

No earthquake was likely felt in Eastvale in the 24 hours to 10:10 pm PST (06:10 UTC). The last one was M 1.7, 7 km (4 mi) NNW, at 2:48 pm PDT on 9 October 2026, estimated intensity II (weak) in town. Every earthquake near Eastvale

This page: a magnitude 2.3 earthquake was recorded 4 km (3 mi) east-northeast of Eastvale, CA, at 9:09 pm PDT on 1 August 2017 (04:09 UTC), 11 km deep. 74 people have reported feeling it to USGS.

USGS: 1km SW of Mira Loma, CA

6 km (4 mi) ENE of Eastvale, CA · 82 km (51 mi) E of Los Angeles, CA

9:09 pm PDT, Aug 1, 2017 · · 11 km deep · released about 74 lb of TNT

Every earthquake near Eastvale Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 41 kmLos Angeles County 72 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
9:09 pm PDT on 1 August 2017 ()
Where
4 km (3 mi) east-northeast of Eastvale, CA · earthquakes near Eastvale
Magnitude
M 2.3 (ml)
Depth
11 km below the surface
Felt
74 reports · strongest reported intensity III
Nearest
Orange County, 41 km SW
Nearest mapped fault
Red Hill-Etiwanda Avenue fault, 16 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 3303 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 16 km (10 mi) from the epicentre. In Eastvale, 4 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: Eastvale 4 km, intensity II · Pedley 5 km, intensity II · Norco 6 km, intensity II · Rubidoux 11 km, intensity II · Riverside 12 km, intensity II · Corona 13 km, intensity II · Ontario 14 km, intensity II · Fontana 15 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 74 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 13× the energy of this one
  4. This earthquake M 2.3 about 74 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 11 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.2 3 km SE of San Bernardino, California · 27 km ENE of this epicentre
  2. 6.0 The 1910 Lake Elsinore, California Earthquake · 34 km SSE of this epicentre
  3. 5.5 The 1990 Upland, California Earthquake · 24 km NW of this epicentre
  4. 5.4 5km S of Chino Hills, CA · 22 km W of this epicentre
  5. 5.3 Near San Bernardino, California · 46 km ENE 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 33.9840, -117.5260. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 41 km (26 mi) SW earthquakes near Orange County
Los Angeles County, CA 72 km (45 mi) WNW earthquakes near Los Angeles County
San Diego County, CA 127 km (79 mi) SSE earthquakes near San Diego County

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

Aftershocks so far

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

  1. 2.0 1km NNE of Calimesa, CA
  2. 1.7 6km ENE of Lake Arrowhead, CA
  3. 1.8 4km E of Running Springs, CA
  4. 2.3 5km S of Lytle Creek, CA
  5. 2.2 2km N of Colton, CA
  6. 1.5 4km SE of Home Gardens, CA
  7. 2.1 3km E of Norco, CA
  8. 1.6 1km SW of Colton, CA
  9. 2.2 3km ENE of North Tustin, CA
  10. 1.6 2km SE of Redlands, CA
  11. 1.8 2km ENE of Colton, CA
  12. 1.8 4km NNE of Moreno Valley, CA
  13. 1.6 1km NNW of Loma Linda, CA
  14. 2.4 2km SE of Redlands, CA
  15. 1.5 2km SSE of Redlands, 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.