Earthquake · reviewed by a seismologist
M 2.9ml
Earthquake near Grand Terrace, CA
No earthquake was likely felt in Grand Terrace in the 24 hours to 8:45 pm PST (04:45 UTC). The last one was M 2.1, 6 km (4 mi) E, at 10:40 am PDT on 31 October 2026, estimated intensity II (weak) in town. Every earthquake near Grand Terrace
This page: a magnitude 2.9 earthquake was recorded 4 km (3 mi) southeast of Grand Terrace, CA, at 10:14 am PDT on 3 July 2017 (17:14 UTC), 14 km deep. 259 people have reported feeling it to USGS.
USGS: 4km SE of Grand Terrace, CA
7 km (4 mi) SE of Colton, CA · 104 km (65 mi) E of Los Angeles, CA
- When
- 10:14 am PDT on 3 July 2017 ()
- Where
- 4 km (3 mi) southeast of Grand Terrace, CA · earthquakes near Grand Terrace
- Magnitude
- M 2.9 (ml)
- Depth
- 14 km below the surface
- Felt
- 259 reports · strongest reported intensity III
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Orange County, 59 km SW
- Nearest mapped fault
- San Jacinto 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 3416 days ago
Earthquake alerts for Grand Terrace, 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 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 29 km (18 mi) from the epicentre. In Grand Terrace, 4 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: Loma Linda 5 km, intensity III · Colton 8 km, intensity III · Moreno Valley 9 km, intensity III · Redlands 11 km, intensity II · San Bernardino 11 km, intensity II · Rubidoux 11 km, intensity II · Riverside 12 km, intensity II · Rialto 14 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 700 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
- Magna, Utah 2020 M 5.7 15,000× the energy of this one
- Around the size people start to feel M 3.0 1.4× the energy of this one
- This earthquake M 2.9 about 700 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 4.4 on 2016-01-06 — about 170 times the energy of this one.
Before 2016, the USGS record lists 20 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 39 km SE of this epicentre
- 6.3 The 1992 Big Bear, California Earthquake · 47 km ENE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 9 km NNE of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 36 km SSW of this epicentre
- 5.6 7km ENE of Running Springs, CA · 34 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 34.0065, -117.2820. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 59 km (36 mi) | SW | earthquakes near Orange County |
| Los Angeles County, CA | 93 km (58 mi) | WNW | earthquakes near Los Angeles County |
| San Diego County, CA | 119 km (74 mi) | SSE | earthquakes near San Diego County |
| Riverside County, CA | 122 km (76 mi) | ESE | earthquakes near Riverside County |
| San Bernardino County, CA | 138 km (86 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
40 earthquakes have been recorded within 50 km since this one.
- 1.9 7km NE of Beaumont, CA
- 3.1 8km N of Cabazon, CA
- 2.0 2km W of Devore, CA
- 1.7 3km S of Lytle Creek, CA
- 1.6 4km S of Banning, CA
- 1.7 3km NNE of Moreno Valley, CA
- 3.2 10km NNE of Running Springs, CA
- 1.5 7km NE of Beaumont, CA
- 1.9 5km S of Redlands, CA
- 1.6 11km NE of Lake Arrowhead, CA
- 1.9 4km SE of Home Gardens, CA
- 1.5 6km NNE of Running Springs, CA
- 3.5 2km E of Big Bear Lake, CA
- 1.6 7km NW of Banning, CA
- 2.0 11km N of Banning, 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.