Earthquake · reviewed by a seismologist
M 3.1ml
Earthquake near Muscoy, CA
No earthquake was likely felt in Muscoy in the 24 hours to 9:50 pm PST (05:50 UTC). The last one was M 2.2, 17 km (10 mi) SE, at 8:15 pm PDT on 29 October 2026, estimated intensity II (weak) in town; 1 felt report to USGS. Every earthquake near Muscoy
This page: a magnitude 3.1 earthquake was recorded 5 km (3 mi) east-northeast of Muscoy, CA, at 4:06 pm PDT on 2 June 2016 (23:06 UTC), 8.7 km deep. 71 people have reported feeling it to USGS.
USGS: 6km ENE of Muscoy, CA
in San Bernardino, CA
- When
- 4:06 pm PDT on 2 June 2016 ()
- Where
- 5 km (3 mi) east-northeast of Muscoy, CA · earthquakes near Muscoy
- Magnitude
- M 3.1 (ml)
- Depth
- 8.7 km below the surface
- Felt
- 71 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Orange County, 72 km SW
- Nearest mapped fault
- San Andreas 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 3745 days ago
Earthquake alerts for Muscoy, CA
Get a notification in this browser when USGS records an earthquake near Muscoy, 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 42 km (26 mi) from the epicentre. In Muscoy, 5 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: Muscoy 5 km, intensity III · San Bernardino 8 km, intensity III · Highland 10 km, intensity III · Rialto 11 km, intensity III · Colton 12 km, intensity III · Lake Arrowhead 12 km, intensity III · Loma Linda 15 km, intensity III · Fontana 16 km, intensity III. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 1,500 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 220,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
- Magna, Utah 2020 M 5.7 6,900× the energy of this one
- This earthquake M 3.1 about 1,500 lb of TNT
- Around the size people start to feel M 3.0 this one released 1.6× more
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 75 times the energy of this one.
Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:
- 6.3 The 1992 Big Bear, California Earthquake · 43 km E of this epicentre
- 6.2 3 km SE of San Bernardino, California · 11 km SSE of this epicentre
- 5.6 7km ENE of Running Springs, CA · 24 km ENE of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 37 km W of this epicentre
- 5.5 11km SSE of Big Bear Lake, California · 41 km E 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 34.1797, -117.2932. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 72 km (45 mi) | SW | earthquakes near Orange County |
| Los Angeles County, CA | 89 km (55 mi) | W | earthquakes near Los Angeles County |
| San Bernardino County, CA | 127 km (79 mi) | NE | earthquakes near San Bernardino County |
| Riverside County, CA | 129 km (80 mi) | ESE | earthquakes near Riverside 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.
- 1.9 7km SSE of Home Gardens, CA
- 1.8 14km S of Big Bear Lake, CA
- 1.7 2km S of Chino Hills, CA
- 1.6 10km NNW of Big Bear Lake, CA
- 1.6 11km SSW of Lucerne Valley, CA
- 2.6 12km SSE of Big Bear City, CA
- 1.5 9km E of Yucaipa, CA
- 1.8 5km ENE of Banning, CA
- 1.6 7km SSE of Home Gardens, CA
- 1.8 3km SSW of Big Bear City, CA
- 1.6 2km SW of San Bernardino, CA
- 1.6 4km SE of Home Gardens, CA
- 1.7 11km SSW of Lucerne Valley, CA
- 1.5 2km NNE of Lake Arrowhead, CA
- 1.6 9km NNW of Cabazon, 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.