Earthquake · reviewed by a seismologist
M 1.8ml
Earthquake near Valencia, CA
No earthquake was likely felt in Valencia in the 24 hours to 5:46 am PST (13:46 UTC). The last one was M 2.2, 6 km (4 mi) S, at 8:32 am PDT on 18 October 2026, estimated intensity II (weak) in town; 16 felt reports to USGS. Every earthquake near Valencia
This page: a magnitude 1.8 earthquake was recorded 30 km (19 mi) north of Valencia, CA, at 3:32 am PDT on 27 October 2023 (10:32 UTC), 12 km deep.
USGS: 7 km SSE of Neenach, CA
79 km (49 mi) NNW of Los Angeles, CA · 34 km (21 mi) NNW of Santa Clarita, CA
- When
- 3:32 am PDT on 27 October 2023 ()
- Where
- 30 km (19 mi) north of Valencia, CA · earthquakes near Valencia
- Magnitude
- M 1.8 (ml)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Ventura County, 64 km SW
- Nearest mapped fault
- San Andreas fault, 4 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 1112 days ago
Earthquake alerts for Valencia, CA
Get a notification in this browser when USGS records an earthquake near Valencia, 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 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 6 km (4 mi) from the epicentre. In Valencia, 30 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.
Earthquakes near other towns within 30 km: Castaic, Lebec, Leona Valley.
How big was it?
This earthquake released about 13 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 1,100,000× the energy of this one
- Magna, Utah 2020 M 5.7 810,000× the energy of this one
- Around the size people start to feel M 3.0 72× the energy of this one
- This earthquake M 1.8 about 13 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 4.2 on 2020-07-30 — about 4,100 times the energy of this one.
Before 2016, the USGS record lists 27 earthquakes of M5 or more within 50 km; the five largest:
- 7.5 The 1952 Kern County, California Earthquake · 46 km NW of this epicentre
- 6.6 1971 San Fernando Earthquake, California · 39 km SSE of this epicentre
- 6.0 Tejon Pass, California · 35 km NW of this epicentre
- 5.9 1km ENE of Granada Hills, California · 50 km S of this epicentre
- 5.8 10km SSW of Agua Dulce, CA · 39 km SSE 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 34.7172, -118.5908. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Ventura County, CA | 64 km (40 mi) | SW | earthquakes near Ventura County |
| Los Angeles County, CA | 65 km (41 mi) | SSE | earthquakes near Los Angeles County |
| Kern County, CA | 71 km (44 mi) | N | earthquakes near Kern County |
| Orange County, CA | 138 km (86 mi) | SSE | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
42 earthquakes have been recorded within 50 km since this one.
- 1.5 13 km W of Mojave, CA
- 1.5 3 km NW of Chatsworth, CA
- 2.0 11 km ENE of Pine Mountain Club, CA
- 1.6 3 km NNW of Chatsworth, CA
- 2.0 4 km N of Frazier Park, CA
- 1.6 14 km N of Fillmore, CA
- 1.9 15 km N of Fillmore, CA
- 1.7 7 km S of Mojave, CA
- 1.6 8 km E of Lebec, CA
- 2.3 10 km SSW of Valencia, CA
- 1.9 10 km SW of Valencia, CA
- 1.7 2 km NNW of Frazier Park, CA
- 1.6 7 km SSW of Mojave, CA
- 1.7 13 km N of Fillmore, CA
- 1.5 20 km N of Fillmore, 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.