Earthquake · reviewed by a seismologist
M 3.1ml
Earthquake near Littlerock, CA
No earthquake was likely felt in Littlerock in the 24 hours to 7:06 am PST (15:06 UTC). The last one was M 3.8, 73 km (45 mi) W, at 8:00 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 199 felt reports to USGS. Every earthquake near Littlerock
This page: a magnitude 3.1 earthquake was recorded 7 km (4 mi) south-southeast of Littlerock, CA, at 8:52 am PST on 26 November 2020 (16:52 UTC), 7.2 km deep. 124 people have reported feeling it to USGS.
USGS: 7km SSE of Littlerock, CA
64 km (40 mi) NE of Los Angeles, CA · 19 km (12 mi) SE of Palmdale, CA
- When
- 8:52 am PST on 26 November 2020 ()
- Where
- 7 km (4 mi) south-southeast of Littlerock, CA · earthquakes near Littlerock
- Magnitude
- M 3.1 (ml)
- Depth
- 7.2 km below the surface
- Felt
- 124 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Los Angeles County, 40 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 2105 days ago
Earthquake alerts for Littlerock, CA
Get a notification in this browser when USGS records an earthquake near Littlerock, 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 41 km (25 mi) from the epicentre. In Littlerock, 7 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: Wrightwood 32 km, intensity II · Altadena 34 km, intensity II · Sierra Madre 35 km, intensity II · Monrovia 35 km, intensity II · Phelan 36 km, intensity II · Arcadia 37 km, intensity II · Azusa 37 km, intensity II · Glendora 38 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 1,300 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 6.7 250,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
- Magna, Utah 2020 M 5.7 7,900× the energy of this one
- This earthquake M 3.1 about 1,300 lb of TNT
- Around the size people start to feel M 3.0 this one released 1.4× 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 4.5 on 2020-09-19 — about 140 times the energy of this one.
Before 2016, the USGS record lists 10 earthquakes of M5 or more within 50 km; the five largest:
- 6.6 1971 San Fernando Earthquake, California · 38 km W of this epicentre
- 5.9 The 1987 Whittier Narrows, California Earthquake · 46 km SSW of this epicentre
- 5.8 10km SSW of Agua Dulce, CA · 38 km W of this epicentre
- 5.8 10km SSW of Agua Dulce, CA · 38 km W of this epicentre
- 5.8 The 1991 Sierra Madre, California Earthquake · 22 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 34.4638, -117.9625. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Los Angeles County, CA | 40 km (25 mi) | SW | earthquakes near Los Angeles County |
| Orange County, CA | 89 km (55 mi) | S | earthquakes near Orange County |
| Ventura County, CA | 108 km (67 mi) | W | earthquakes near Ventura County |
| Kern County, CA | 121 km (75 mi) | NW | earthquakes near Kern County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
29 earthquakes have been recorded within 50 km since this one.
- 1.6 2km N of Claremont, CA
- 2.2 7km SW of Pearblossom, CA
- 1.9 7km SW of Pearblossom, CA
- 1.5 7km SSE of Littlerock, CA
- 2.0 2km N of Lytle Creek, CA
- 1.6 5km NNW of Sylmar, CA
- 1.6 1km W of Sierra Madre, CA
- 1.8 4km NNW of Wrightwood, CA
- 1.8 7km SW of Pearblossom, CA
- 2.5 0km NW of Pacoima, CA
- 2.3 1km WNW of Pacoima, CA
- 1.6 3km SSE of Charter Oak, CA
- 1.5 4km NNE of Montebello, CA
- 1.5 7km SW of Pearblossom, CA
- 2.6 7km SSE of Littlerock, 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.