Earthquake · reviewed by a seismologist
M 2.0ml
Earthquake near San Dimas, CA
No earthquake was likely felt in San Dimas in the 24 hours to 8:33 am PST (16:33 UTC). The last one was M 3.2, 23 km (14 mi) ESE, at 5:37 am PDT on 2 September 2026, estimated intensity II (weak) in town; 730 felt reports to USGS. Every earthquake near San Dimas
This page: a magnitude 2.0 earthquake was recorded 6 km (4 mi) north-northeast of San Dimas, CA, at 12:01 am PDT on 28 May 2026 (07:01 UTC), 10 km deep.
USGS: 6 km NNE of San Dimas, CA
6 km (4 mi) ENE of Glendora, CA · 59 km (37 mi) ENE of Los Angeles, CA
- When
- 12:01 am PDT on 28 May 2026 ()
- Where
- 6 km (4 mi) north-northeast of San Dimas, CA · earthquakes near San Dimas
- Magnitude
- M 2.0 (ml)
- Depth
- 10 km below the surface
- Felt
- no reports yet
- Nearest
- Los Angeles County, 44 km W
- Nearest mapped fault
- Sierra Madre fault, 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 168 days ago
Earthquake alerts for San Dimas, CA
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This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth, people at rest would likely notice it out to about 12 km (7 mi) from the epicentre. In San Dimas, 6 km away, the estimate is intensity II (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: San Dimas 6 km, intensity II · La Verne 6 km, intensity II · Glendora 8 km, intensity II · Claremont 9 km, intensity II · Azusa 11 km, intensity II · Pomona 12 km, intensity II · Covina 12 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 31 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 480,000× the energy of this one
- Magna, Utah 2020 M 5.7 340,000× the energy of this one
- Around the size people start to feel M 3.0 31× the energy of this one
- This earthquake M 2.0 about 31 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 4.5 on 2020-09-19 — about 6,200 times the energy of this one.
Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:
- 6.2 3 km SE of San Bernardino, California · 49 km E of this epicentre
- 5.9 The 1987 Whittier Narrows, California Earthquake · 29 km WSW of this epicentre
- 5.8 The 1991 Sierra Madre, California Earthquake · 23 km NW of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 8 km E of this epicentre
- 5.4 5km S of Chino Hills, CA · 23 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 34.1562, -117.7870. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Los Angeles County, CA | 44 km (27 mi) | W | earthquakes near Los Angeles County |
| Orange County, CA | 53 km (33 mi) | S | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
50 earthquakes have been recorded within 50 km since this one.
- 1.9 1 km SW of Bell, CA
- 1.5 5 km SE of Ontario, CA
- 3.2 6 km SE of Ontario, CA
- 1.6 4 km WNW of Muscoy, CA
- 1.7 6 km NNW of Fontana, CA
- 1.7 4 km SE of Home Gardens, CA
- 1.7 1 km S of Wrightwood, CA
- 1.7 2 km NNW of La Verne, CA
- 1.6 7 km SSE of Home Gardens, CA
- 1.6 3 km NE of Silver Lake, CA
- 1.6 6 km SE of Ontario, CA
- 2.8 6 km SE of Ontario, CA
- 1.6 2 km WNW of Wrightwood, CA
- 1.5 2 km WNW of Wrightwood, CA
- 1.6 2 km WNW of Wrightwood, 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.