Earthquake · reviewed by a seismologist
M 1.8ml
Earthquake near Westminster, CA
No earthquake was likely felt in Westminster in the 24 hours to 5:18 am PST (13:18 UTC). The last one was M 3.2, 17 km (10 mi) W, at 12:44 am PDT on 9 October 2026, estimated intensity II (weak) in town; 1,090 felt reports to USGS. Every earthquake near Westminster
This page: a magnitude 1.8 earthquake was recorded 3 km (2 mi) east-southeast of Westminster, CA, at 4:57 am PDT on 13 September 2024 (11:57 UTC), 3.3 km deep.
USGS: 3 km ESE of Westminster, CA
in Westminster, CA · 50 km (31 mi) SE of Los Angeles, CA
- When
- 4:57 am PDT on 13 September 2024 ()
- Where
- 3 km (2 mi) east-southeast of Westminster, CA · earthquakes near Westminster
- Magnitude
- M 1.8 (ml)
- Depth
- 3.3 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 20 km ESE
- Nearest mapped fault
- Newport-Inglewood-Rose Canyon fault, 6 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 790 days ago
Earthquake alerts for Westminster, CA
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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 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 14 km (9 mi) from the epicentre. In Westminster, 3 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: Westminster 3 km, intensity II · Garden Grove 4 km, intensity II · Fountain Valley 5 km, intensity II · Stanton 7 km, intensity II · Huntington Beach 10 km, intensity II · Cypress 10 km, intensity II · Santa Ana 10 km, intensity II · Anaheim 11 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 900,000× the energy of this one
- Magna, Utah 2020 M 5.7 640,000× the energy of this one
- Around the size people start to feel M 3.0 57× the energy of this one
- This earthquake M 1.8 about 17 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 12,000 times the energy of this one.
Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:
- 6.4 The 1933 Long Beach, California Earthquake · 13 km S of this epicentre
- 5.9 The 1987 Whittier Narrows, California Earthquake · 36 km NNW of this epicentre
- 5.4 5km S of Chino Hills, CA · 30 km NE of this epicentre
- 5.3 7km W of Newport Beach, CA · 14 km S of this epicentre
- 5.2 8km ENE of Trabuco Canyon, CA · 43 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 33.7457, -117.9750. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 20 km (12 mi) | ESE | earthquakes near Orange County |
| Los Angeles County, CA | 57 km (35 mi) | NNW | earthquakes near Los Angeles County |
| Ventura County, CA | 127 km (79 mi) | WNW | earthquakes near Ventura County |
| San Diego County, CA | 137 km (85 mi) | SE | earthquakes near San Diego County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
38 earthquakes have been recorded within 50 km since this one.
- 2.1 5 km SE of Ontario, CA
- 2.3 5 km SE of Ontario, CA
- 1.6 5 km SE of Home Gardens, CA
- 1.7 4 km ESE of Yorba Linda, CA
- 1.7 3 km SE of Ontario, CA
- 1.6 4 km SE of Home Gardens, CA
- 1.6 5 km SE of Ontario, CA
- 2.1 5 km SE of Ontario, CA
- 1.9 5 km SE of Ontario, CA
- 2.5 5 km SE of Ontario, CA
- 2.0 6 km SE of Ontario, CA
- 1.5 5 km SE of Ontario, CA
- 4.0 5 km SE of Ontario, CA
- 1.7 5 km SSE of Highland Park, CA
- 2.0 5 km SE of Ontario, 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.