QuakeIndex

Earthquake · reviewed by a seismologist

M 4.4mw

Earthquake near La Verne, CA

No earthquake was likely felt in La Verne in the 24 hours to 11:03 pm PST (07:03 UTC). The last one was M 3.2, 19 km (12 mi) ESE, at 5:37 am PDT on 2 September 2026, estimated intensity III (weak) in town; 730 felt reports to USGS. Every earthquake near La Verne

This page: a magnitude 4.4 earthquake was recorded 4 km (2 mi) north of La Verne, CA, at 7:33 pm PDT on 28 August 2018 (02:33 UTC), 5.5 km deep. 6,155 people have reported feeling it to USGS.

USGS: 4km N of La Verne, CA

7 km (4 mi) E of Glendora, CA · 60 km (37 mi) ENE of Los Angeles, CA

7:33 pm PDT, Aug 28, 2018 · · 5.5 km deep · released about 56 tons of TNT

Every earthquake near La Verne Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 45 kmOrange County 51 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
7:33 pm PDT on 28 August 2018 ()
Where
4 km (2 mi) north of La Verne, CA · earthquakes near La Verne
Magnitude
M 4.4 (mw)
Depth
5.5 km below the surface
Felt
6,155 reports · strongest reported intensity V
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Los Angeles County, 45 km W
Nearest mapped fault
Sierra Madre 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 945 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

At this magnitude and depth, people at rest would likely notice it out to about 128 km (80 mi) from the epicentre. In La Verne, 4 km away, the estimate is intensity IV (light). 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: La Verne 4 km, intensity IV · San Dimas 4 km, intensity IV · Claremont 7 km, intensity IV · Glendora 8 km, intensity IV · Pomona 9 km, intensity IV · Montclair 10 km, intensity IV · Covina 12 km, intensity IV · Azusa 12 km, intensity IV. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 56 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 3,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 130× the energy of this one
  3. Magna, Utah 2020 M 5.7 95× the energy of this one
  4. This earthquake M 4.4 about 56 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 120× 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 (31 mi) since our catalogue begins in 2016. No other earthquake of M4 or more has been recorded this close in that time.

Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.2 3 km SE of San Bernardino, California · 48 km E of this epicentre
  2. 5.9 The 1987 Whittier Narrows, California Earthquake · 29 km WSW of this epicentre
  3. 5.8 The 1991 Sierra Madre, California Earthquake · 25 km NW of this epicentre
  4. 5.5 The 1990 Upland, California Earthquake · 7 km E of this epicentre
  5. 5.4 5km S of Chino Hills, CA · 21 km S 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 34.1363, -117.7747. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Los Angeles County, CA 45 km (28 mi) W earthquakes near Los Angeles County
Orange County, CA 51 km (32 mi) S earthquakes near Orange County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.5 4km NNW of La Verne, CA
  2. 1.6 6km WSW of Devore, CA
  3. 1.8 4km SE of Home Gardens, CA
  4. 1.6 7km SE of Home Gardens, CA
  5. 1.7 4km N of La Verne, CA
  6. 1.6 7km NW of Rancho Cucamonga, CA
  7. 1.5 4km SE of Home Gardens, CA
  8. 1.9 7km S of Lytle Creek, CA
  9. 1.6 0km SSW of Loma Linda, CA
  10. 2.1 4km ENE of Lytle Creek, CA
  11. 2.9 4km N of La Verne, CA
  12. 1.6 1km ESE of Maywood, CA
  13. 1.7 8km SSE of Home Gardens, CA
  14. 1.6 5km SE of Home Gardens, CA
  15. 1.5 7km SSE of Home Gardens, 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.