QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6ml

Earthquake near Yucaipa, CA

No earthquake was likely felt in Yucaipa in the 24 hours to 1:06 pm PST (21:06 UTC). The last one was M 1.5, 8 km (5 mi) ESE, at 3:54 pm PST on 9 November 2026, estimated intensity II (weak) in town. Every earthquake near Yucaipa

This page: a magnitude 2.6 earthquake was recorded 8 km (5 mi) east of Yucaipa, CA, at 9:50 pm PDT on 18 September 2023 (04:50 UTC), 6.8 km deep. 48 people have reported feeling it to USGS.

USGS: 8 km E of Yucaipa, CA

8 km (5 mi) E of Yucaipa, CA · 134 km (83 mi) E of Los Angeles, CA

9:50 pm PDT, Sep 18, 2023 · · 6.8 km deep · released about 240 lb of TNT

Every earthquake near Yucaipa Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 85 kmRiverside County 94 kmSan Diego County 112 kmSan Bernardino County 117 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
9:50 pm PDT on 18 September 2023 ()
Where
8 km (5 mi) east of Yucaipa, CA · earthquakes near Yucaipa
Magnitude
M 2.6 (ml)
Depth
6.8 km below the surface
Felt
48 reports · strongest reported intensity IV
Nearest
Orange County, 85 km WSW
Nearest mapped fault
San Andreas fault, 3 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 1076 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 22 km (14 mi) from the epicentre. In Yucaipa, 8 km away, the estimate is intensity III (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: Yucaipa 8 km, intensity III · Beaumont 10 km, intensity II · Banning 13 km, intensity II · Mentone 17 km, intensity II · Redlands 21 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 240 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 63,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 45,000× the energy of this one
  3. Around the size people start to feel M 3.0 4× the energy of this one
  4. This earthquake M 2.6 about 240 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 2018-05-08 — about 680 times the energy of this one.

Before 2016, the USGS record lists 22 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.7 The 1918 San Jacinto, California Earthquake · 29 km S of this epicentre
  2. 6.3 The 1992 Big Bear, California Earthquake · 23 km NNE of this epicentre
  3. 6.2 3 km SE of San Bernardino, California · 29 km WNW of this epicentre
  4. 6.0 The 1986 North Palm Springs, California Earthquake · 32 km E of this epicentre
  5. 5.6 7km ENE of Running Springs, CA · 25 km NNW 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 34.0225, -116.9582. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 85 km (53 mi) WSW earthquakes near Orange County
Riverside County, CA 94 km (58 mi) ESE earthquakes near Riverside County
San Diego County, CA 112 km (70 mi) S earthquakes near San Diego County
San Bernardino County, CA 117 km (73 mi) NE earthquakes near San Bernardino County

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

Aftershocks so far

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

  1. 1.6 11 km SSW of Idyllwild, CA
  2. 1.5 4 km ENE of Calimesa, CA
  3. 1.8 5 km NE of Desert Hot Springs, CA
  4. 2.3 10 km NNW of Big Bear City, CA
  5. 2.2 5 km S of Idyllwild, CA
  6. 2.3 9 km NNW of Big Bear City, CA
  7. 2.1 8 km NE of Yucaipa, CA
  8. 1.8 4 km NNE of Fontana, CA
  9. 1.5 3 km SE of San Jacinto, CA
  10. 1.6 3 km SE of San Jacinto, CA
  11. 1.6 6 km S of Loma Linda, CA
  12. 1.7 9 km SW of Morongo Valley, CA
  13. 1.9 5 km ESE of Beaumont, CA
  14. 1.6 1 km NNE of San Jacinto, CA
  15. 2.5 3 km E of Devore, 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.