Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near Santa Margarita, CA
No earthquake was likely felt in Santa Margarita in the 24 hours to 4:08 am PST (12:08 UTC). The last one was M 2.1, 12 km (7 mi) WNW, at 6:08 am PDT on 21 October 2026, estimated intensity II (weak) in town; 3 felt reports to USGS. Every earthquake near Santa Margarita
This page: a magnitude 1.5 earthquake was recorded 24 km (15 mi) east-southeast of Santa Margarita, CA, at 2:21 am PST on 12 February 2023 (10:21 UTC), 5.8 km deep.
USGS: 24km ESE of Santa Margarita, CA
40 km (25 mi) N of Santa Maria, CA · 122 km (76 mi) W of Bakersfield, CA
- When
- 2:21 am PST on 12 February 2023 ()
- Where
- 24 km (15 mi) east-southeast of Santa Margarita, CA · earthquakes near Santa Margarita
- Magnitude
- M 1.5 (md)
- Depth
- 5.8 km below the surface
- Felt
- no reports yet
- Nearest
- San Luis Obispo County, 13 km NNW
- Nearest mapped fault
- Los Osos fault, 18 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 1366 days ago
Earthquake alerts for Santa Margarita, 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 9 km (6 mi) from the epicentre. In Santa Margarita, 24 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: San Luis Obispo, Arroyo Grande, Nipomo, Grover Beach, Pismo Beach, Oceano.
How big was it?
This earthquake released about 6.2 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
- Around the size people start to feel M 3.0 150× the energy of this one
- This earthquake M 1.5 about 6.2 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:
- 5.0 5 km SSW of Nipomo, California · 34 km SSW 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 35.2858, -120.3803. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Luis Obispo County, CA | 13 km (8 mi) | NNW | earthquakes near San Luis Obispo County |
| Santa Barbara County, CA | 89 km (55 mi) | SSE | earthquakes near Santa Barbara County |
| Kings County, CA | 101 km (63 mi) | NNE | earthquakes near Kings County |
| Monterey County, CA | 136 km (84 mi) | NW | earthquakes near Monterey County |
| Ventura County, CA | 154 km (95 mi) | SE | earthquakes near Ventura 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.
- 2.8 20 km NE of Nipomo, CA
- 1.7 9 km WNW of Templeton, CA
- 2.0 3 km E of Avila Beach, CA
- 2.0 5 km SE of Cholame, CA
- 2.1 10 km ENE of Cayucos, CA
- 1.8 3 km S of Baywood-Los Osos, CA
- 1.8 15 km NE of Arroyo Grande, CA
- 2.2 5 km W of Templeton, CA
- 1.7 8 km ESE of San Luis Obispo, CA
- 2.0 10 km WNW of Templeton, CA
- 1.9 4 km W of Santa Margarita, CA
- 1.5 11 km E of San Luis Obispo, CA
- 2.5 16 km W of Simmler, CA
- 1.7 11 km NE of Cayucos, CA
- 1.6 5 km SE of Cholame, 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.