Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Colton, CA
No earthquake was likely felt in Colton in the 24 hours to 6:07 am PST (14:07 UTC). The last one was M 2.1, 8 km (5 mi) SE, at 10:40 am PDT on 31 October 2026, estimated intensity II (weak) in town. Every earthquake near Colton
This page: a magnitude 1.7 earthquake was recorded 2 km (1 mi) north-northeast of Colton, CA, at 12:15 am PDT on 18 May 2023 (07:15 UTC), 9.6 km deep.
USGS: 2km NNE of Colton, CA
6 km (3 mi) SSW of San Bernardino, CA · in Colton, CA
- When
- 12:15 am PDT on 18 May 2023 ()
- Where
- 2 km (1 mi) north-northeast of Colton, CA · earthquakes near Colton
- Magnitude
- M 1.7 (ml)
- Depth
- 9.6 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 63 km SW
- Nearest mapped fault
- San Jacinto fault, 2 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 1274 days ago
Earthquake alerts for Colton, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
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 7 km (4 mi) from the epicentre. In Colton, 2 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: Colton 2 km, intensity II · San Bernardino 2 km, intensity II · Rialto 6 km, intensity II · Loma Linda 7 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 9.6 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.
- Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 99× the energy of this one
- This earthquake M 1.7 about 9.6 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 17,000 times the energy of this one.
Before 2016, the USGS record lists 21 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 48 km SE of this epicentre
- 6.3 The 1992 Big Bear, California Earthquake · 46 km ENE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 5 km E of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 44 km S of this epicentre
- 5.6 7km ENE of Running Springs, CA · 30 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 34.0922, -117.3087. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 63 km (39 mi) | SW | earthquakes near Orange County |
| Los Angeles County, CA | 88 km (55 mi) | W | earthquakes near Los Angeles County |
| San Diego County, CA | 129 km (80 mi) | SSE | earthquakes near San Diego County |
| San Bernardino County, CA | 134 km (83 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
56 earthquakes have been recorded within 50 km since this one.
- 2.3 4km N of Big Bear City, CA
- 1.6 4km N of Big Bear City, CA
- 2.0 6km N of Big Bear City, CA
- 1.9 4km NW of Banning, CA
- 2.6 8km NNW of Rancho Cucamonga, CA
- 1.7 2km NNW of Colton, CA
- 1.6 10km WSW of Corona, CA
- 1.8 10km WSW of Corona, CA
- 1.6 8km N of Cabazon, CA
- 2.7 6km NE of Fontana, CA
- 2.7 5km NW of San Jacinto, CA
- 1.6 6km NW of San Jacinto, CA
- 1.9 8km SSE of Wrightwood, CA
- 1.6 12km NNE of Banning, CA
- 2.1 8km ESE of Yucaipa, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.