Earthquake · reviewed by a seismologist
M 2.8ml
Earthquake near Pedley, CA
No earthquake was likely felt in Pedley in the 24 hours to 4:58 am PST (12:58 UTC). The last one was M 2.0, 14 km (9 mi) N, at 2:35 am PDT on 23 October 2026, estimated intensity II (weak) in town; 3 felt reports to USGS. Every earthquake near Pedley
This page: a magnitude 2.8 earthquake was recorded 6 km (4 mi) south-southeast of Pedley, CA, at 3:03 am PDT on 9 July 2020 (10:03 UTC), 5.3 km deep. 866 people have reported feeling it to USGS.
USGS: 6km SSE of Pedley, CA
7 km (4 mi) WSW of Riverside, CA
- When
- 3:03 am PDT on 9 July 2020 ()
- Where
- 6 km (4 mi) south-southeast of Pedley, CA · earthquakes near Pedley
- Magnitude
- M 2.8 (ml)
- Depth
- 5.3 km below the surface
- Felt
- 866 reports · strongest reported intensity IV
- Measured shaking
- intensity V (ShakeMap)
- Nearest
- Orange County, 40 km SW
- Nearest mapped fault
- Elsinore fault, 15 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 1920 days ago
Earthquake alerts for Pedley, CA
Get a notification in this browser when USGS records an earthquake near Pedley, CA. No account or email needed.
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 26 km (16 mi) from the epicentre. In Pedley, 6 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: Pedley 6 km, intensity III · Riverside 7 km, intensity III · Norco 8 km, intensity III · Rubidoux 10 km, intensity III · Eastvale 10 km, intensity III · Corona 11 km, intensity III · Fontana 19 km, intensity II · Moreno Valley 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 430 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 35,000× the energy of this one
- Magna, Utah 2020 M 5.7 25,000× the energy of this one
- Around the size people start to feel M 3.0 2.2× the energy of this one
- This earthquake M 2.8 about 430 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 2018-08-29 — about 260 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 49 km ESE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 26 km NE of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 25 km SSE of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 33 km NW of this epicentre
- 5.4 5km S of Chino Hills, CA · 28 km W 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 33.9233, -117.4623. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 40 km (25 mi) | SW | earthquakes near Orange County |
| Los Angeles County, CA | 80 km (50 mi) | WNW | earthquakes near Los Angeles County |
| San Diego County, CA | 119 km (74 mi) | SSE | earthquakes near San Diego County |
| San Bernardino County, CA | 157 km (97 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
54 earthquakes have been recorded within 50 km since this one.
- 1.8 5km NW of Glen Avon, CA
- 1.6 6km N of Fontana, CA
- 1.8 9km WSW of Corona, CA
- 1.7 4km ENE of Calimesa, CA
- 1.8 7km NNE of Fontana, CA
- 1.5 5km SSW of Redlands, CA
- 1.5 6km SSE of Rancho Cucamonga, CA
- 1.6 4km SE of Home Gardens, CA
- 2.0 5km NW of Glen Avon, CA
- 1.7 6km NW of Glen Avon, CA
- 1.6 4km SE of Lytle Creek, CA
- 2.9 5km NW of Glen Avon, CA
- 1.6 5km NW of Glen Avon, CA
- 1.7 6km NW of Glen Avon, CA
- 1.5 5km NNE of Moreno Valley, 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.