QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

Earthquake near Muscoy, CA

No earthquake was likely felt in Muscoy in the 24 hours to 7:13 am PST (15:13 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 2.5 earthquake was recorded 3 km (2 mi) east-northeast of Muscoy, CA, at 6:47 pm PDT on 11 July 2022 (01:47 UTC), 6.8 km deep. 20 people have reported feeling it to USGS.

USGS: 3km ENE of Muscoy, CA

in San Bernardino, CA

6:47 pm PDT, Jul 11, 2022 · · 6.8 km deep · released about 180 lb of TNT

Every earthquake near Muscoy Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 70 kmLos Angeles County 87 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
6:47 pm PDT on 11 July 2022 ()
Where
3 km (2 mi) east-northeast of Muscoy, CA · earthquakes near Muscoy
Magnitude
M 2.5 (ml)
Depth
6.8 km below the surface
Felt
20 reports · strongest reported intensity III
Nearest
Orange County, 70 km SW
Nearest mapped fault
San Andreas 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 1510 days ago

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 21 km (13 mi) from the epicentre. In Muscoy, 3 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 3 km, intensity III · San Bernardino 7 km, intensity III · Rialto 9 km, intensity II · Highland 11 km, intensity II · Colton 11 km, intensity II · Lake Arrowhead 14 km, intensity II · Fontana 14 km, intensity II · Loma Linda 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 180 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 83,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 59,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.2× the energy of this one
  4. This earthquake M 2.5 about 180 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 640 times the energy of this one.

Before 2016, the USGS record lists 15 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.3 The 1992 Big Bear, California Earthquake · 45 km E of this epicentre
  2. 6.2 3 km SE of San Bernardino, California · 10 km SSE of this epicentre
  3. 5.6 7km ENE of Running Springs, CA · 26 km ENE of this epicentre
  4. 5.5 The 1990 Upland, California Earthquake · 35 km W of this epicentre
  5. 5.5 11km SSE of Big Bear Lake, California · 42 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 34.1713, -117.3132. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 70 km (43 mi) SW earthquakes near Orange County
Los Angeles County, CA 87 km (54 mi) W earthquakes near Los Angeles County
San Bernardino County, CA 129 km (80 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

44 earthquakes have been recorded within 50 km since this one.

  1. 2.0 5km NW of Mira Loma, CA
  2. 1.6 7km SSE of Home Gardens, CA
  3. 2.1 3km W of Devore, CA
  4. 1.6 6km NNE of Beaumont, CA
  5. 3.2 8km NNE of Banning, CA
  6. 1.9 2km WNW of Beaumont, CA
  7. 1.7 5km NW of Mira Loma, CA
  8. 1.5 5km NW of Mira Loma, CA
  9. 2.2 1km SSE of Colton, CA
  10. 1.5 5km WSW of Fontana, CA
  11. 2.2 1km SE of Loma Linda, CA
  12. 2.0 5km NW of Mira Loma, CA
  13. 3.6 5km NW of Mira Loma, CA
  14. 1.7 5km SSE of Home Gardens, CA
  15. 2.0 2km SSE of Big Bear City, 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.