Earthquake · reviewed by a seismologist
M 1.8ml
Earthquake near Frazier Park, CA
No earthquake was likely felt in Frazier Park in the 24 hours to 2:47 pm PST (22:47 UTC). The last one was M 3.8, 51 km (31 mi) SSE, at 8:00 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 199 felt reports to USGS. Every earthquake near Frazier Park
This page: a magnitude 1.8 earthquake was recorded 20 km (13 mi) south-southwest of Frazier Park, CA, at 3:45 pm PST on 27 February 2021 (23:45 UTC), 5.4 km deep.
USGS: 20km SSW of Frazier Park, CA
92 km (57 mi) NW of Los Angeles, CA · 48 km (30 mi) NNE of San Buenaventura (Ventura), CA
- When
- 3:45 pm PST on 27 February 2021 ()
- Where
- 20 km (13 mi) south-southwest of Frazier Park, CA · earthquakes near Frazier Park
- Magnitude
- M 1.8 (ml)
- Depth
- 5.4 km below the surface
- Felt
- no reports yet
- Nearest
- Ventura County, 34 km SSW
- Nearest mapped fault
- Santa Ynez fault, 12 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 2081 days ago
Earthquake alerts for Frazier Park, 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 12 km (7 mi) from the epicentre. In Frazier Park, 20 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: Pine Mountain Club, Lebec, Ojai.
How big was it?
This earthquake released about 14 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 5.7 790,000× the energy of this one
- Around the size people start to feel M 3.0 70× the energy of this one
- This earthquake M 1.8 about 14 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 4.1 on 2016-03-12 — about 3,500 times the energy of this one.
Before 2016, the USGS record lists 22 earthquakes of M5 or more within 50 km; the five largest:
- 7.5 The 1952 Kern County, California Earthquake · 33 km N of this epicentre
- 6.0 Tejon Pass, California · 30 km NNE of this epicentre
- 5.8 13km WNW of Grapevine, CA · 35 km N of this epicentre
- 5.6 7km NNE of Simi Valley, California · 49 km SE of this epicentre
- 5.5 Southwest of Tejon Pass, California · 6 km NE 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 34.6597, -119.0468. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Ventura County, CA | 34 km (21 mi) | SSW | earthquakes near Ventura County |
| Kern County, CA | 82 km (51 mi) | NNE | earthquakes near Kern County |
| Los Angeles County, CA | 89 km (55 mi) | SE | earthquakes near Los Angeles County |
| Santa Barbara County, CA | 92 km (57 mi) | W | earthquakes near Santa Barbara County |
| Orange County, CA | 160 km (99 mi) | SE | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
55 earthquakes have been recorded within 50 km since this one.
- 1.8 12km WSW of Lake Hughes, CA
- 1.8 12km WSW of Lake Hughes, CA
- 1.6 8km W of Frazier Park, CA
- 1.6 19km N of Pine Mountain Club, CA
- 1.9 9km W of Grapevine, CA
- 2.4 13km WSW of Ojai, CA
- 1.5 17km ENE of Lebec, CA
- 1.7 18km WNW of Grapevine, CA
- 1.7 7km N of Piru, CA
- 1.6 9km NNW of Piru, CA
- 1.7 18km N of Pine Mountain Club, CA
- 1.6 10km NNE of Ventura, CA
- 1.5 12km NNE of Pine Mountain Club, CA
- 3.6 5km NNW of Thousand Oaks, CA
- 2.0 14km NNW of Grapevine, 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.