Earthquake · reviewed by a seismologist
M 1.9ml
Earthquake near Colton, CA
No earthquake was likely felt in Colton in the 24 hours to 6:40 am PST (14:40 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 1.9 earthquake was recorded 2 km (1 mi) east of Colton, CA, at 3:58 am PDT on 31 July 2019 (10:58 UTC), 17 km deep. 3 people have reported feeling it to USGS.
USGS: 2km E of Colton, CA
in Colton, CA · 103 km (64 mi) E of Los Angeles, CA
- When
- 3:58 am PDT on 31 July 2019 ()
- Where
- 2 km (1 mi) east of Colton, CA · earthquakes near Colton
- Magnitude
- M 1.9 (ml)
- Depth
- 17 km below the surface
- Felt
- 3 reports · strongest reported intensity II
- Nearest
- Orange County, 63 km SW
- Nearest mapped fault
- San Jacinto fault, under 1 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 2661 days ago
Earthquake alerts for Colton, CA
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This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth it was probably too small to be felt, even directly above it. 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.
Earthquakes near other towns within 30 km: San Bernardino, Loma Linda, Grand Terrace, Highgrove, Rialto, Bloomington.
How big was it?
This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 730,000× the energy of this one
- Magna, Utah 2020 M 5.7 520,000× the energy of this one
- Around the size people start to feel M 3.0 46× the energy of this one
- This earthquake M 1.9 about 21 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 7,900 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 · 46 km SE of this epicentre
- 6.3 The 1992 Big Bear, California Earthquake · 45 km ENE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 3 km ENE of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 43 km SSW of this epicentre
- 5.6 7km ENE of Running Springs, CA · 30 km NE 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 34.0747, -117.2917. 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 | 90 km (56 mi) | W | earthquakes near Los Angeles County |
| Riverside County, CA | 125 km (78 mi) | ESE | earthquakes near Riverside County |
| San Diego County, CA | 126 km (78 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
52 earthquakes have been recorded within 50 km since this one.
- 2.0 12km N of Cabazon, CA
- 1.6 10km NNE of Cabazon, CA
- 3.4 10km NNE of Cabazon, CA
- 1.7 11km NNE of Cabazon, CA
- 1.6 3km SSE of Home Gardens, CA
- 2.2 3km WNW of Cabazon, CA
- 2.1 2km S of Lake Elsinore, CA
- 2.8 2km SSW of Lake Elsinore, CA
- 2.0 1km S of Lake Elsinore, CA
- 1.8 1km SSW of Lake Elsinore, CA
- 3.2 2km NE of Lakeland Village, CA
- 1.9 6km WNW of Mira Loma, CA
- 1.6 3km NNW of Mira Loma, CA
- 1.7 13km N of Cabazon, CA
- 1.8 3km NNW of Mira Loma, 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.